Nov-09 NOTES: The papers listed here have been obtained by search SPE and IPTC papers post 2005 on the SPE's OnePetro The papers relating to reservoir engineering have been catergorised for inclusion on the reservoirengineering.org.uk website The affiiations searched were; Total No Papers 551 575 482 191 55 255 1130 95 235 3569 Reservoir Engineering Related 175 279 238 68 37 129 563 53 175 1717

BP Shell Chevron ConocoPhillips Marathon Total Schlumberger Imperial College, London Heriot Watt University, Edinburgh (Anywhere in Article) Total

Total number of papers published post 2005 =

10,000

35% of papers published categorised

OrganisationBP SCHLUMBERGER CHEVRON Heriot Watt University SHELL SHELL

Paper Source No.SPE SPE SPE SPE SPE SPE 90680 109860 110272 110272 102304 98098

ChapterWell Testing Well Testing Well Testing Well Testing Well Testing Well Testing

SectionAnalysis Analysis - Closed Chamber Tests Analysis - Fluivial Reservoir Analysis - Fluivial Reservoir Analysis - Fractured Water Injector Analysis - Fractured Well

CHEVRON SCHLUMBERGER SHELL BP SCHLUMBERGER BP SCHLUMBERGER CHEVRON SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER SHELL BP BP TOTAL SHELL BP SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER CONOCO SHELL SHELL BP Imperial College SCHLUMBERGER SHELL SCHLUMBERGER SCHLUMBERGER TOTAL SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER SCHLUMBERGER Heriot Watt University

SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE IPTC SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE IPTC SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE

105134 105134 104480 100836 110576 104581 116969 113903 104059 120515 123115 109053 11691 102483 102483 115720 102484 102575 123555 114594 117435 88735 108665 11672 100993 109279 109279 113650 118148 118148 110873 116003 114127 115478 90992 101475 103223 121949

Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing

Analysis - Horizontal Wells Analysis - Horizontal Wells Analysis - Horizontal Wells Analysis - Low Permeability Analysis - Multi-Fractured Wells Analysis - Multilaterals Analysis - Multilayer Reservoir Analysis - Multiphase Analysis - Naturally Fractured Reservoir Analysis - Radius of Investigation Analysis - Real Time Evaluation Connected Volume Estimation Connected Volume Estimation Connected Volume Estimation Connected Volume Estimation Connected Volume Estimation Deconvolution Deconvolution Exploration Wells Fracture Diagnostics Horizontal WElls HP/HT HP/HT Interference testing Lean gas Condensate Mini-DST Mini-DST MiniDST Interpretation Multiphase Metering Multiphase Metering Multiphase Metering Multiphase Metering Multiphase Metering Multiphase Metering Multiphase Metering Multiphase Metering Multiphase Metering Multi-well Decovolution

Heriot Watt University Heriot Watt University SCHLUMBERGER SCHLUMBERGER SHELL Heriot Watt University TOTAL Heriot Watt University Imperial College Imperial College Imperial College Heriot Watt University Heriot Watt University Heriot Watt University TOTAL Heriot Watt University

SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE

122409 100951 105271 107967 99971 128359 128359 100993 89904 89905 94018 120893 113323 107521 110820 107209

Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well Testing Well testing Well Testing

Numercial Analysis Numerical Analysis Numerical Modelling Production Analysis Production Monitoring PTA PTA PTA PTA PTA PTA PTA PTA Interpretation PTA Interpretation Real gas Flow Analysis Rel Perm Determination

CHEVRON SCHLUMBERGER Imperial College Imperial College SCHLUMBERGER TOTAL BP MARATHON TOTAL TOTAL

SPE SPE SPE SPE SPE SPE SPE SPE SPE SPE

112732 103040 100136 102079 102106 115820 113888 124271 105685 103216

Well Testing Well Testing Well Testing Well Testing Well Testing Well testing Well Testing Well Testing Well Testing Well testing

Sand Prediction State of the Nation State of the Nation State of the Nation Streaming Potential Measurement Testing by Production Logging Uncertainty Value of Information Vertical Interference Test Wellbore Storage Analysis

SubjectDeconvolution

amber Tests PTA/Seismic Attribute PTA/Seismic Attribute PFO SRT

Carbonate Reservoir Carbonate Reservoir PTA Rate Dependent Transient Flow Stacked Reservoirs Layer Properties 2 Phase Partial Penetration Reserve Estimation PTA

Design and Interpretation Image Log Thermal Transient Analysis Annular Pressure Buildup Behaviour Gas Condensate Temperature Data Analysis Deepwater Deepwater Gas Challenging Conditions Challenging Conditions Gas Condensate Heavy Oil Reliability Validation

Streamline Heterogeneity Full Field Simulations Integral Derivative Function Optmisation/Automation Flow Regime Identification Flow Regime Identification Gas Condensate Gas Condensate Gas Condensate Gas Condensate Challenging Conditions Deconvolution/Decline Curve Wavelet Method Average Pressure Approximation

Pre Drill DST Prediction Advances in Interpretation and Measurement Analysis Approaches Evolution of Deconvolution Technology Application Test Interpretation West Brae Field Permeability Anisotropy Deconvolution

TitlePractical Considerations for Pressure-Rate Deconvolution of Well-Test Data A New Approach for Interpreting Pressure Data To Estimate Key Reservoir Parameters From Closed-Chamber Tests Integrating Pressure Transient Test Data With Seismic Attribute Analysis to Characterize an Offshore Fluvial Reservoir Integrating Pressure Transient Test Data With Seismic Attribute Analysis to Characterize an Offshore Fluvial Reservoir Application of New Fall-Off Test Interpretation Methodology to Fractured Water Injection Wells Offshore Sakhalin New Analysis of Step-Rate Injection Tests for Improved Fracture Stimulation Design

Challenges Encountered During a Comprehensive Test Analysis for a Horizontal Well in a Thin, Carbonate Reservoir of the Greater Burgan Field, Kuwait Challenges Encountered During a Comprehensive Test Analysis for a Horizontal Well in a Thin, Carbonate Reservoir of the Gr Horizontal Well" Pressure Transient Analysis for Gulf of Mexico Reservoirs (Adapting the Slant Well Solution to Layered Media Analysis of Rate Dependence in Transient Linear Flow in Tight Gas Wells A Unique Methodology for Evaluation of Multi-Fractured Wells in Stacked-Pay Reservoirs Using Commingled Production and R Transient Behavior of Multilateral Wells in Numerical Models: A Hybrid Analytical-Numerical Approach Identifying Layer Permeabilities and Skin Using a Multi-Layer Transient Testing Approach in a Complex Reservoir Environmen

Use of Transient Testing Data To Calculate Absolute Permeability and Average Fluid Saturations Pressure Transient Analysis of Partially Penetrating Wells in a Naturally Fractured Reservoir Radius of Investigation for Reserve Estimation From Pressure Transient Well Tests Real-Time Evaluation of Pressure Transients: Advances in Dynamic Reservoir Monitoring Use of Advanced Pressure Transient Analysis Techniques To Improve Drainage Area Calculations and Reservoir Characterisa Evaluating Connected Reservoir Volume for Optimizing Reservoir Management in Farragon Field, an Offshore North Sea New The Use of Well Testing for Evaluation of Connected Reservoir Volume The Use of Well Testing for Evaluation of Connected Reservoir Volume Magnetic Resonance in Chalk Horizontal Well Logged With LWD Deconvolution of Multiwell Test Data An Investigation of Recent Deconvolution Methods for Well-Test Data Analysis Advanced Methods to Design and Interpret Exploration Well Tests---Two Case Studies Estimating Fracture Permeability and Shape Factor by Use of Image Log Data in Welltest Analysis Thermal Transient Analysis Applied to Horizontal Wells Transient Behavior of Annular Pressure Buildup in HP/HT Wells HP/HT Gas-Condensate Well Testing for Shell's Onyx SW Prospect The New Interference Test: Reservoir Connectivity Information from Downhole Temperature Data Well Test Analysis in Lean Gas Condensate Reservoirs: Theory and Practice Mini-DST Applications for Shell Deepwater Malaysia Mini-DST Applications for Shell Deepwater Malaysia A New Method for Gas Well Deliverability Potential Estimation Using MiniDST and Single Well Modeling: Theory and Example Extending the Range of Multiphase Metering to Challenging High Water Cut Gas-Lifted Wells: TOTAL ABK Field Application Extending the Range of Multiphase Metering to Challenging High Water Cut Gas-Lifted Wells: TOTAL ABK Field Application Testing Gas Condensate Wells in Northern Siberia With Multiphase Flowmeters Improving Reservoir Characterization Using Accurate Flow-Rate History Reliability of Multiphase Flowmeters and Test Separators at High Water Cut Field Validation Processes for Multiphase Wet Gas Surface Well Testing Solutions: Example From the Yamburgskoe Arctic Ga High-Accuracy Wet-Gas Multiphase Well Testing and Production Metering Production Well Testing Optimization Using Multiphase Flow Meters (MPFM) Field Experience in Multiphase Gas-Well Testing: The Benefit of the Combination of Venturi and Gamma Ray Fraction Meter Multi-Well Deconvolution Algorithm for the Diagnostic, Analysis of Transient Pressure With Interference From Permanent Dow

New Advance in Numerical Well Testing Through Streamline Simulation Fighting Against Nonunique-Solution Problems in Heterogeneous Reservoirs Through Numerical Well Testing Linking Well-Test Interpretations to Full Field Simulations Application of the -Integral Derivative Function to Production Analysis Well-Test Optimization and Automation Statistical Diagnosis (VEMST) of Flow Regime: Alternative to Pressure Derivative Approach in Pressure Transient Analysis Statistical Diagnosis (VEMST) of Flow Regime: Alternative to Pressure Derivative Approach in Pressure Transient Analysis Well Test Analysis in Lean Gas Condensate Reservoirs: Theory and Practice Condensate-Bank Characterization From Well-Test Data and Fluid PVT Properties Well Test Analysis of Horizontal Wells in Gas/Condensate Reservoirs Estimating Productivity-Controlling Parameters in Gas/Condensate Wells From Transient Pressure Data Pressure Transient Well Testing Encountered Complexities: A Case Study Application of Deconvolution and Decline-Curve Analysis Methods for Transient Pressure Analysis Analyzing Transient Pressure From Permanent Downhole Gauges (PDG) Using Wavelet Method Application of Convolution and Average Pressure Approximation for Solving Nonlinear Flow Problems--Constant Wellbore Pre Using Drillstem and Production Tests To Model Reservoir Relative Permeabilities Deepwater Exploration Well Pre-Drill DST Sanding Potential Prediction Using Probabilistic and Deterministic Approaches A Digital Pressure Derivative Technique for Pressure Transient Well Testing and Reservoir Characterization New Approaches in Well Testing

From Straight Lines to Deconvolution: The Evolution of the State of the Art in Well Test Analysis Streaming Potential Applications in Oil Fields Method and Application of Cyclic Well Testing with Production Logging Evaluation of Confidence Intervals in Well Test Interpretation Results The Value of Well TestingOptimisation of the West Brae Field A New Technique To Determine Horizontal and Vertical Permeabilities From the Time-Delayed Response of a Vertical Interfer Explicit Deconvolution of Wellbore Storage Distorted Well Test Data

Author

Abstract

Michael M. Levitan, SPE, BP plc; Gary E. Crawford, SPE, WTS; and Andrew Hardwick, SPE, BP plc deconvolution provides e Summary Pressure-rate N.M.A. Rahman, SPE, Schlumberger, and M.S. Santo and L. Mattar, SPE, Fekete Assocs. technique for analyzing and model Abstract A new Akshay Sahni, SPE, Ken Kelsch, SPE, Hathaiporn Samorn, and Chalatpon Boonmeelapprasert, SPE, Chevron Abstract Interpreting pressure transient tests in co Akshay Sahni, SPE, Ken Kelsch, SPE, Hathaiporn Samorn, and Chalatpon Abstract InterpretingSPE, Chevron Boonmeelapprasert, pressure transient tests in co P.J. van den Hoek, SPE, Shell Intl. E&P B.V.; D. Volchkov, SPE, and G. Burgos, SPE, Sakhalin Energy; and R.A. Masfry, SPE Abstract It is well established within the Industry th K. Lizak, Shell; K. Bartko, Saudi Aramco; F. Self, G. Izquierdo, and M. Al-Mumen, Halliburton Abstract Prehydraulic fracture diagnostic pumping

A.K. Ambastha, SPE, and M. Anderson, SPE, Chevron Corp.; H. Gandhi, SPE, Kuwait Oil Co.; and P.-D. Maizeret, SPE, Schlumberger Abstract Mauddud reservoir in the Greater Burgan A.K. Ambastha, SPE, and M. Anderson, SPE, Chevron Corp.; H. Gandhi, SPE, Kuwait Oil Co.; and P.-D.in the Greater Burgan Abstract Mauddud reservoir Maizeret, SPE, Schlu P.S. Fair, Shell International Exploration and Production Inc. Introduction There are three objectives of this pap M. Ibrahim, Suez Canal U., and R.A. Wattenbarger, Texas A&M U. Abstract Many tight gas wells (permeability less th J.F. Manrique, Occidental Oil and Gas Corporation, and B.D. Poe Jr., Schlumberger We present a unique methodology desig Abstract C. Aguilar, SPE, BP Alaska, and E. Ozkan, SPE, H. Kazemi, SPE, M. Al-Kobaisi, SPE, and B. Ramirez, SPE,extension of tran Abstract This paper presents an Colorado Schoo Moustafa Eissa, Sameer Joshi, and Kamaljeet Singh, SPE, Schlumberger, and Ajay Bahuguna and Mohamed Elbadri, GNPOC Abstract Conventional pressure transient testing u

Medhat M. Kamal and Yan Pan, Chevron Energy Technology Company Abstract A new well testing analysis method is pre K. Slimani, Sonatrach; D. Tiab, U. of Oklahoma; and K. Moncada, Schlumberger Abstract Often and for many reasons the wellbore Fikri J. Kuchuk, SPE, Schlumberger Abstract Although it is often used in pressure tran C. Contreras, SPE, S. Bodwadkar, SPE, and A. Kosmala, SPE, Schlumberger Abstract Reservoir engineers operating in mature Kui-Fu Du, SPE, NAM, The Netherlands Abstract This paper presents several field exampl Julio Herbas, SPE, Munawar Usman, SPE, Ronnie Parr and Jordy Buter, BP Exploration Farragon field discovered in April 20 Abstract The Operating Company Limited M.M. Levitan, SPE, and M.J. Ward, SPE, BP plc.; J.-L. Boutaud de la Combe, SPE, Total S.A.; and M.R. Wilson, Well-Test So Abstract In its search for new oil and gas reserves M.M. Levitan, SPE, and M.J. Ward, SPE, BP plc.; J.-L. Boutaud de la Combe, SPE, Total S.A.; and M.R. Wilson, Well-Test So Abstract In its search for new oil and gas reserves Arve K. Thorsen, SPE, Tor Eiane, SPE, and Holger Thern, SPE, Baker Hughes, and This paper describes geological andSPE, Abstract Paal Fristad and Stephen Williams, petro Michael M. Levitan, SPE, BP plc Summary The deconvolution analysis technique th M. Onur, SPE, and M. Cinar,* SPE, Istanbul Technical University; D. Ilk, SPE, P.P Valko, this work we present an investigation Summary In SPE, and T.A. Blasingame, SPE, Te A.J.G. Carnegie, Schlumberger; Stephen Ball, Premier Oil Vietnam; Pierre-David Maizeret, Schlumberger (DST) were conducte Abstract Two Drill stem tests Vietnam; and David Two Case Studies Hassan Bahrami, Sharif University of Technology; Jamal Siavoshi, Husky Energy Canada; Soodabeh Esmaili and Mohammad Abstract The identification of fractures is essential Anh N. Duong, SPE, ConocoPhillips Canada Abstract The effectiveness of heat injection into a P. Oudeman, SPE, Shell Int. E&P, M. Kerem, SPE, Shell Int. E&P Summary Pressure buildup caused by fluid therm Arild Foss, Expro; Derek MacKenzie, Norske Shell; Odd Steinveg and Eric Henderson,paper covers the van den Bosch, Ha Abstract This Expro; and Bart HPHT Gas-Conde D.A. Hutchinson, N. Kuramshina, A. Sheydayev, S. Day, BP Abstract The Chirag Field located offshore in the C A.C. Gringarten, M. Bozorgzadeh, S. Daungkaew, and A. Hashemi, SPE, Imperial College, London reservoirs exhibit a com Abstract Gas condensate S. Daungkaew, J.H. Harfoushian, and B. Cheong, Schlumberger; and O. Akinsanmi and J.Yeo, Shell; appraisal campaigns for Abstract Exploration and and S. Toulekima, Santo S. Daungkaew, J.H. Harfoushian, and B. Cheong, Schlumberger; and O. Akinsanmi and J.Yeo, Shell; appraisal campaigns for Abstract Exploration and and S. Toulekima, Santo N.Karthik Kumar, SPE, Sameer Joshi, SPE and Raj Banerjee, SPE, Schlumberger, K.M.Sundaram, ONGC Abstract This paper presents techniques for interp David Costa; Total ABK, Jean-Paul Couput, Total; Florian Hollaender, Bruno PinguetFlow Thomas Koshy;conventional separa Abstract and metering using Schlumberger David Costa; Total ABK, Jean-Paul Couput, Total; Florian Hollaender, Bruno PinguetFlow Thomas Koshy;conventional separa Abstract and metering using Schlumberger B. Theuveny, Schlumberger; I.A. Zinchenko, Yamburggazdobycha Gazprom; Y. Shumakov, Schlumberger performed in Yam Abstract A number of tests were E.J. Pinilla, SPE, C.H. Pardo, SPE, L.M. Warlick, SPE, and Y.M. Al-Shobaili, SPE, Saudi Aramco, and M.N. Aftab, A. Khan, an Abstract Well testing is one of the most effective m Kelechi Isaac Ojukwu, Petroleum Development Oman, and John Edwards, Schlumberger use of multiphase flowmeters (MPFM Abstract The B. Theuveny, Y. Shumakov, and A. Zhandin, Schlumberger, and I. Zinchenko, Gazprom Abstract Surface welltesting of Gas-Condensate w D.I. Atkinson, Schlumberger Cambridge Research; . Reksten, 3-Phase Measurements A/S; G. Smith, Schlumberger; and H Summary Dedicated wet-gas flowmeters are now M. Metwalli Hassan and M. Bekkoucha, ADCO, and M. Abukhader, Schlumberger Production testing using portable Multipha Abstract B.G. Pinguet, G. Roux, and N. Hopman, Schlumberger Abstract Using multiphase flowmeters in field ope Zheng Shi-Yi, SPE, and Wang Fei, Heriot-Watt University Abstract Permanent Down-hole Gauge (PDG) has

Yao Jun, China University of Petroleum, and Zheng Shiyi, SPE, Heriot-Watt Abstract Numerical well testing technique has bee University Zheng Shi-Yi, SPE, Heriot-Watt U. Abstract Numerical well testing started in about a Faisal M. Al-Thawad, SPE, and Jim S. Liu, SPE, Saudi Aramco, and Raj Banerjee, SPE, and Dominic this study was to investig Abstract The objective of Agyapong, SPE, Schlum D. Ilk, N. Hosseinpour-Zonoozi, S. Amini, and T.A. Blasingame, Texas A&MAbstract In this work we present the application of U. R. Cramer, Shell Global Solutions; C. Moncur, Shell Global Solutions B.V.; and L. Berendschot, be done to improve the Well T Abstract Much can Shell Global Solutions Victor T. Biu, Total E&P Nigeria, Emmanuel O. Biu, University of Port Harcourt, and Mike O. Onyekonwu, Laseridentification of Abstract Before the early eighties Engineering C Victor T. Biu, Total E&P Nigeria, Emmanuel O. Biu, University of Port Harcourt, and Mike O. Onyekonwu, Laseridentification of Abstract Before the early eighties Engineering C A.C. Gringarten, M. Bozorgzadeh, S. Daungkaew, and A. Hashemi, SPE, Imperial College, London reservoirs exhibit a com Abstract Gas condensate Manijeh Bozorgzadeh, SPE, and Alain C. Gringarten, SPE, Imperial CollegeSummary Published well-test analyses in gas/con London A. Hashemi , SPE, Imperial College London; L.M. Nicolas , SPE, Gaz de France; and A.C. Gringarten , SPE, Imperial College Summary Gas/condensate reservoirs usually exhi

Manijeh Bozorgzadeh, SPE, and Alain C. Gringarten, SPE, Imperial CollegeSummary The ability to predict well deliverability is Pooyan Karami and Abolfazl Hashemi Petropars Oil and Gas Company National Iranian Oil Company testing is one of the m Abstract Pressure transient Zheng Shiyi, SPE, and Wang Fei; Heriot-Watt University; Edinburgh; Scotland Abstract Traditionally well testing is completed by a Zheng Shi-Yi and Li Xiao-Gang, Heriot-Watt U. Abstract Reservoir pressure monitoring during its p M. Zhakupov, SPE, Total S.A., and D. Ilk, SPE, and T.A. Blasingame, SPE, Abstract Real gas" flow problems (i.e. problems w Texas A&M U. John D. Matthews, SPE, Jonathan N. Carter, SPE, Robert W. Zimmerman, SPE, Imperial College, London Summary Relative permeabilities are fundamenta

Xianjie Yi, James E. Sabolcik, and Harvey E. Goodman, Chevron Energy Technology Company, and Brent W. Walton, Chevron International Exploration & Production Company Abstract Sand control decisions are often made ba A.F. Veneruso, SPE, and J. Spath, SPE, Schlumberger Abstract The pressure derivative has become the S.N. Zakirov, I.M. Indrupskiy, E.S. Zakirov, SPE, D.P. Anikeev, A.I. Tarasov, and O.V. Bradulina, Inst. of the Russian Academ Abstract Modern methodology of well testing is th

A.C. Gringarten, Imperial C. Abstract Well test analysis has been used for man M.-Y. Chen, B. Raghuraman, SPE, I. Bryant, SPE, and M. Supp, Schlumberger Abstract Two successful field tests of streaming p J. Rochon, SPE, V. Jaffrezic, SPE, and J.L. Boutaud de La Combe, SPE, TOTAL Exploration & predicaments of traditional ,we Abstract One of the Production; M. Azari, SPE S. Azi, A. C.*, SPE, Imperial College, Gbo, A.**, SPE, Imperial College, Whittle, T.***, SPE, Baker Atlas and Gringarten,resultsSP Abstract Uncertainty in well test analysis A.C., fro Mike Tharagonnet, SPE, Marathon Oil Corporation Abstract The purpose of this paper is to increase t James J. Sheng, Baker Hughes Abstract Vertical and horizontal permeabilities are O. Bahabanian, D. Ilk, N. Hosseinpour-Zonoozi, and T.A. Blasingame, SPE,Abstract TheU. Texas A&M analysis/interpretation of wellbore st

ate deconvolution provides equivalent representation of variable-rate well-test data in the form of characteristic constant rate drawdown sys ique for analyzing and modeling the pressure data from both flow and buildup periods in closed chamber tests (CCT) has been developed.

pressure transient tests in complex faulted and stratigraphic environments can be difficult. In fluvial depositional environments where sand pressure transient tests in complex faulted and stratigraphic environments can be difficult. In fluvial depositional environments where sand ablished within the Industry that injection of (produced) water almost always takes place under fracturing conditions. Particularly when large ic fracture diagnostic pumping analysis has recently improved with the use of new analysis techniques such as G-Function derivative plots

eservoir in the Greater Burgan field is a thin carbonate reservoir containing light oil in a 10-20 ft target zone with good porosity. Ma eservoir in the Greater Burgan field is a thin carbonate reservoir containing light oil in a 10-20 ft target zone with good porosity. Ma re three objectives of this paper. The first objective is to present a generalized geometric skin for deviated wells for all angles up to 89.9 as wells (permeability less than 0.1 md) exhibit linear flow through their transient period. This transient period may last for years in some ca a unique methodology designed for evaluation and optimization of multi-fractured wells in stacked pay reservoirs using commingled produc presents an extension of transient well index approach to simulate pressure transient behavior of multilateral wells. This approach uses an al pressure transient testing using a pressure gauge positioned at a fixed depth in a well has historically been the main source of permeab

esting analysis method is presented. The method allows for calculating the absolute permeability of the formation in the area influenced by or many reasons the wellbore does not completely penetrate the entire formation yielding a unique early-time pressure behavior. Some of t s often used in pressure transient testing radius of investigation still is an ambiguous concept and there is no standard definition in the pe ngineers operating in mature fields across the world struggle to get necessary reservoir data to make their exploitation plans more realistic. presents several field examples of applying two independent methods of increasing tested area estimation and improving reservoir characte n field discovered in April 2003 is a low relief pancake shaped reservoir located in the UK sector of the North Sea. This relatively small of h for new oil and gas reserves the oil industry moves to more and more remote areas of the world and to technically challenging areas of de h for new oil and gas reserves the oil industry moves to more and more remote areas of the world and to technically challenging areas of de escribes geological and petrophysical evaluation of a new structure of a mature field to evaluate the reservoir potential in un-produced rese volution analysis technique that evolved with development of the deconvolution algorithms by von Schroeter et al. (2004) Levitan (2005) a k we present an investigation of recent deconvolution methods proposed by von Schroeter et al. (2002 2004) Levitan (2005) and Levitan

ation of fractures is essential during exploration drilling and well completion of naturally fractured reservoirs since they have a significant im eness of heat injection into a target formation has a great impact on the efficiency of bitumen and heavy oil recovery and energy savings un buildup caused by fluid thermal expansion in sealed annuli of high-presure/high-temperature (HP/HT) wells can have serious consequence covers the HPHT Gas-Condensate Exploration Well 6406/9-1 on the Onyx SW prospect of the Norway Sea in the late spring of 2005 (Figu Field located offshore in the Caspian Sea of Azerbaijan uses permanent downhole gauges to record continuous pressure and temperature nsate reservoirs exhibit a complex behavior when wells are produced below the dew point due to the existence of a two-fluid system reserv and appraisal campaigns for deepwater environments are a continuous challenge in todays operations. Data acquisition in such enviro and appraisal campaigns for deepwater environments are a continuous challenge in todays operations. Data acquisition in such enviro presents techniques for interpretation of Mini-Drill Stem Test (MiniDST) for establishing commingled Absolute Openhole Flow Potential (AO ng using conventional separation-based technologies in low-pressure high gas rate environments typical of gas-lifted wells is a very difficult ng using conventional separation-based technologies in low-pressure high gas rate environments typical of gas-lifted wells is a very difficult f tests were performed in Yamburggasdobycha Gazprom's fields in Northern Siberia area to evaluate the performance of multiphase flowm is one of the most effective means to characterize hydrocarbon reservoirs under dynamic conditions. Such characterization of reservoirs is multiphase flowmeters (MPFM) for well test measurements is increasingly becoming a standard practice replacing conventional test separa ltesting of Gas-Condensate with multiphase flowmeters is still considered a challenge for production metering. Traditional means of well tes wet-gas flowmeters are now commercially available for the measurement of gas and liquid flow rates and offer a more compact measurem esting using portable Multiphase Flow Meters (MPFM) was implemented in ADCO Field B with objectives to quantify the water and gas phase flowmeters in field operations has now become a widely accepted practice especially in the range of Gas Volume Fraction (GVF) of 0 Down-hole Gauge (PDG) has been widely installed in the oilfield around the world in recent years. One of the challenges in analyzing long-

well testing technique has been regarded as the future of well testing in tackling non-linear heterogeneous reservoir testing problems. Finite well testing started in about a decade ago. The technique was developed to tackle well testing problems in heterogeneous reservoirs. Integr ve of this study was to investigate a workflow where well test data could be used more effectively in history matching of full-field reservoir si we present the application of the -integral derivative function for the interpretation and analysis of production data. The -derivative functi be done to improve the Well Testing through effective use of minimal electronic instrumentation on the well head and the test separator. Th early eighties identification of flow regime has been a difficult task for reservoir engineer and welltest analyst until the emergence of the der early eighties identification of flow regime has been a difficult task for reservoir engineer and welltest analyst until the emergence of the der nsate reservoirs exhibit a complex behavior when wells are produced below the dew point due to the existence of a two-fluid system reserv well-test analyses in gas/condensate reservoirs in which the pressure has dropped below the dewpoint are usually based on a two- or thre ensate reservoirs usually exhibit complex flow behaviors owing to the buildup of condensate banks around the wells when the bottomhole p

to predict well deliverability is a key issue for the development of gas/condensate reservoirs. We show in this paper that well deliverability d nsient testing is one of the most useful reservoir description methods. It provides valuable information about the reservoir/well-bore charact well testing is completed by analysing transient pressure due to constant production rate. However in the oil industry practice engineer of essure monitoring during its production life is to evaluate its performance to ensure the effective extraction of hydrocarbon from the reservo ow problems (i.e. problems where the gas properties are specifically taken as implicit functions of pressure temperature and composition) ermeabilities are fundamental to any assessment of reserves and reservoir management. When measurements on core samples are availa

l decisions are often made based on a deterministically predicted Safe Drawdown Pressure (SDP) without proper regard to the amount of u re derivative has become the primary interpretation tool for diagnosing well and reservoir behavior. In many situations however the derivati ethodology of well testing is the result of efforts of many scientists for more than 50 years. It is mainly based on the theory of single-phase f

alysis has been used for many years to assess well condition and obtain reservoir parameters. Early interpretation methods (using straight sful field tests of streaming potential measurements in oil fields have been carried out: one in a horizontal oil production well and one in a v redicaments of traditional well testing is the requirement of shutting-in a well to conduct a pressure buildup test for the purpose of obtaining n well test analysis results from errors in pressure and rate measurements from uncertainties in basic well and reservoir parameters; from e of this paper is to increase the data in circulation regarding the value of well testing on established fields. The results of five phases o horizontal permeabilities are important parameters for designing well completion and predicting well performance. In the past to determine s/interpretation of wellbore storage distorted pressure transient test data remains one of the most significant challenges in well test analysis

onstant rate drawdown system response.Deconvolution allows one to develop additional insights into pressure transient behavior and e CT) has been developed. It can be used for estimating the key reservoir parameters such as reservoir pressure permeability and skin. The

environments where sand continuity is a significant uncertainty pressure transient test interpretation can generate several non-unique solu environments where sand continuity is a significant uncertainty pressure transient test interpretation can generate several non-unique solu ns. Particularly when large volumes of very contaminated water are injected either for voidage replacement or disposal- large fractures m G-Function derivative plots after-closure analysis and step-rate tests.OnePetro OnePetro various types and combinations of step-rate inje This paper analyzes

good porosity. Matrix permeability is low and natural fracture density can be variable in this reservoir. Thus this reservoir must b good porosity. Matrix permeability is low and natural fracture density can be variable in this reservoir. Thus this reservoir must b or all angles up to 89.9 extending Cincos slant well solution to smaller bed sizes where the line source approximation is not a valid y last for years in some cases. It has been learned that this behavior differs in many ways from radial flow behavior. This paper reports ano using commingled production. The specialized diagnostic procedures are based on rate-transient analyses and uses historical production s. This approach uses an analytical solution for the well index at early times and switches to the numerical well index at late times. The use e main source of permeability and skin estimation in formations. However if a well is completed as a multi-layer commingled producer then

in the area influenced by the test and the average saturations in this area. The method applies to two-phase flow in the reservoir (oil and w ssure behavior. Some of the main reasons for partial penetration in both fractured and unfractured formations are to prevent or delay the andard definition in the petroleum literature. The pressure diffusion corresponds to an instantaneous propagation of the pressure signal in th ation plans more realistic. Pressure transients are the most effective way to understand the dynamic behavior of the reservoir. Loss mproving reservoir characterisation based on utilising the entire well test history rather than just a single pressure build-up (PBU) or drawdo OnePetro ea. This relatively small offshore field was developed with two sub-sea horizontal wells tied to existing production facilities. Initially the light 3 lly challenging areas of deep water. Development of hydrocarbon resources in these environments is extremely expensive. To be e lly challenging areas of deep water. Development of hydrocarbon resources in these environments is extremely expensive. To be e ential in un-produced reservoir zones. The well was drilled in a carbonate with variations in rock quality and with minor sub-faulting occurrin (2004) Levitan (2005) and Levitan et al. (2006) became a useful addition to the suite of techniques used in well-test analysis. This decon evitan (2005) and Levitan et al. (2006) and Ilk et al. (2006a b). These works offer new solution methods to the long-standing deconvolution

they have a significant impact on flow contribution. There are different methods to characterize these systems based on formation properti ery and energy savings under many steam heating processes such as the startup phase of SAGD (Steam Assisted Gravity Drainage) (Butle have serious consequences such as casing failure or tubing collapse. To determine whether mitigation was required for a HP/HT developm e late spring of 2005 (Figure 1 and 2). The well test design and execution is presented in the paper including; up front planning job design pressure and temperature in the active producers. Bottom-hole pressure data is used extensively to understand interwell communication an a two-fluid system reservoir gas and liquid condensate. Different mobility zones develop around the wellbore corresponding respectively t a acquisition in such environments requires reservoir information of the highest quality before expensive development plans can be put in p a acquisition in such environments requires reservoir information of the highest quality before expensive development plans can be put in p enhole Flow Potential (AOFP) in deep water exploration wells in India. These gas bearing reservoirs are vertically heterogeneous with high ted wells is a very difficult operation. Owing to low retention times of the gas the quality of separation and existing instrumentation is often ted wells is a very difficult operation. Owing to low retention times of the gas the quality of separation and existing instrumentation is often ance of multiphase flowmeters in gas-condensate reservoir applications. The remoteness of the operation and the roughness of winter wea cterization of reservoirs is as accurate as the data used for interpretation. It is therefore essential to have accurate measurements of both OnePetro g conventional test separators. These MPFMs are usually tested and calibrated in laboratory controlled flow loops using idealized fluids in s aditional means of well testing have been deployed for years and used consistently for reservoir and production management. However it c more compact measurement solution than does the traditional separator approach. The interpretation models of traditional multiphase flow quantify the water and gas production evaluate the performance of slugging/intermittent wells for procurement actions evaluate the produc olume Fraction (GVF) of 0 to 85%. There is still some doubt about the performance of this type of device especially in the High (92-96%) or allenges in analyzing long-term real-time dynamic data such as transient pressure from PDG is the diagnostic and analysis of data with inte OnePetro

oir testing problems. Finite difference and finite element methods were used before in the construction of the well testing model which was geneous reservoirs. Integration of geoscience and well testing for improved fluvial reservoir characterisation was the first project of this kind ng of full-field reservoir simulation models and also in situations where existing simulation models could be used in well test interpretation. ta. The -derivative function was recently proposed for the analysis and interpretation of pressure transient data [Hosseinpour-Zonoozi et and the test separator. The purpose of this paper is to describe Shell tools and experiences using the resulting real time data to enable w the emergence of the derivative approach. This approach has helped to reduce the uncertainties of the interpretation of welltest result bec the emergence of the derivative approach. This approach has helped to reduce the uncertainties of the interpretation of welltest result bec a two-fluid system reservoir gas and liquid condensate. Different mobility zones develop around the wellbore corresponding respectively t OnePetro ly based on a two- or three-region radial composite well-test interpretation model to represent condensate dropout around the wellbore and lls when the bottomhole pressure drops below the dewpoint pressure. The formation of this liquid saturation can lead to a severe loss of we

per that well deliverability depends mainly on the gas relative permeabilities at both the endpoint and the near-wellbore saturations as well eservoir/well-bore characteristics (e.g. homogeneity heterogeneities phase segregation stimulation effectiveness interventions etc.) and ustry practice engineer often has to deal with the transient pressure resulted from variable flowing rate history. This is particularly true in the rocarbon from the reservoir. Continuous reservoir monitoring offers a window of prospects to increase well productivity while reducing oper erature and composition) are particularly challenging because the diffusivity equation for the "real gas" flow case is strongly non-linear. n core samples are available however they often predict initial water production that is not experienced by individual wells. For example d

regard to the amount of uncertainty associated with the value of SDP. These uncertainties can be large when planning a Drillstem Test (DS OnePetro ions however the derivative of the measured pressure data is uninterpretable or worse misinterpreted because of various artifacts collecti he theory of single-phase flow. Few publications consider two-phase flow. However they were also generally reduced to single-phase inve

n methods (using straight-lines or log-log pressure plots) were limited to the estimation of well performance. With the introduction of pressu duction well and one in a vertical water injection well. Pressure transients were created and the streaming potentials generated by these tra r the purpose of obtaining well and reservoir properties. This deterrent factor is more prominent in prolific wells due to loss of revenue and eservoir parameters; from the quality of the match with the interpretation model; and from the non-uniqueness of the interpretation model. Y he results of five phases of optimisation resulting in a 17% increase in field production following the change out of the multiphase flow mete e. In the past to determine the permeabilities from a vertical interference test some investigators proposed correlations or type curves base enges in well test analysis. Deconvolution (i.e. the conversion" of a variable-rate distorted pressure profile into the pressure profile for a

e transient behavior and extract more information from well-test data than is possible by using conventional analysis methods.In some c permeability and skin. There are two aspects of the proposed approach - straight-line analysis and modeling. A novel approach is taken to d

e several non-unique solutions all of which may match test data. Using seismic attribute analysis to constrain pressure transient test interp e several non-unique solutions all of which may match test data. Using seismic attribute analysis to constrain pressure transient test interp disposal- large fractures may be induced over time. Unfortunately not much work has been carried out to date to provide methodologies f

Thus this reservoir must be exploited using horizontal wells. Recently a 2 270 ft long horizontal well has been drilled in an area interpr Thus this reservoir must be exploited using horizontal wells. Recently a 2 270 ft long horizontal well has been drilled in an area interpr proximation is not a valid assumption. The second objective of this paper is to extend the slant well solution to layered reservoirs without re or. This paper reports another import difference between linear flow and radial flow rate sensitivity. It has been shown and accepted for uses historical production data (rates and cumulative) and the results from production logs to; 1) determine the flow rates for each individua dex at late times. The use of the transient well index eliminates the need for excessive grid refinement around the well. In this paper we ha ommingled producer then this conventional approach makes it difficult to measure the permeability and skin of individual layers. Greater M

in the reservoir (oil and water or oil and gas). Future expansion to three-phase flow is possible. Current analysis methods yield only the eff re to prevent or delay the intrusion of unwanted fluids into the wellbore i.e. water coning. A similar early-time pressure behavior may be of the pressure signal in the entire spatial domain when a flow rate or pressure pulse is applied to the sandface (beginning of a drawdown o of the reservoir. Loss of production and cost of acquiring data versus the benefits has always been a classical management dilemma.

facilities. Initially the light 34API oil was produced by natural flow and subsequently gas-lift has been used for artificial lift. A few months ly expensive. To be economically viable the newly discovered fields must be developed and effectively exploited with very few wells. T ly expensive. To be economically viable the newly discovered fields must be developed and effectively exploited with very few wells. T minor sub-faulting occurring. Gamma Resistivity Density Neutron and Image services were used in the horizontal part of the well in additi -test analysis. This deconvolution algorithm however is limited to the pressure and rate data that originate from a single active well on the ng-standing deconvolution problem and make deconvolution a viable tool for well-test and production-data analysis. However there exists

ased on formation properties and fluid flow behaviour such as logging and testing. Pressure-transient testing has long been recognized as a d Gravity Drainage) (Butler 1991). However this parameter is hard to calculate due to many unknown variables such as variations in opera ed for a HP/HT development annular pressures in an appraisal well were studied with a dedicated field test which consisted of running a p front planning job design technology selection and review of the test results vs. the objectives for the well test. The paper also addresses nterwell communication and reservoir properties but bottom-hole temperature data had seen little use. However we now find that flowing b rresponding respectively to the original gas in place (away from the well) the condensate drop-out and capillarity number effects (close to ment plans can be put in place. New technology real time monitoring and integrated reservoir data are essential to understand such reservo ment plans can be put in place. New technology real time monitoring and integrated reservoir data are essential to understand such reservo heterogeneous with high permeability. MiniDSTs are conducted using the inflatable straddle packer system of wireline formation teste g instrumentation is often doubtful leading to an under-estimate of liquid rates. An aggravating factor is that such wells are often producing g instrumentation is often doubtful leading to an under-estimate of liquid rates. An aggravating factor is that such wells are often producing e roughness of winter weather conditions combined with the complexity of the fluid compositions create unique challenges to the successfu

using idealized fluids in steady state conditions. However for high water-cut high gas-volume-fraction and low pressure unstable flow thes management. However it can be difficult to compare data sets obtained with different measurement devices. Multiphase flow meters have b raditional multiphase flowmeters emphasize the liquid rate measurements and have been used to well test and meter mostly liquid-rich flow tions evaluate the production test data measured by the conventional test separators and improve the testing duration and strategy. The p lly in the High (92-96%) or Very High GVF (96-98%) ranges. Most of the purchasers put a cut off in the GVF range of 85-92% following the

testing model which was proved worked well for the most practical cases. In this study streamline simulation techniques was further deve he first project of this kind supported by the oil industry that time. When approaching non-unique solution problems in heterogeneous reser in well test interpretation. The need to effectively use information available from well test analysis in full-field simulation has long been reco Hosseinpour-Zonoozi et al (2006)] and we demonstrate that the -integral derivative and its auxiliary functions can be used to provide the eal time data to enable well test optimization and automation. 1.0 Introduction The purpose of well testing is to periodically determine oi ation of welltest result because key regions of radial flow and boundary features required for reservoir characterization description and eval ation of welltest result because key regions of radial flow and boundary features required for reservoir characterization description and eval

t around the wellbore and initial gas in place away from the well. Gas/condensate-specific results from well-test analysis are the mobility an ead to a severe loss of well productivity and therefore lower gas recovery. Several studies have examined various ways to minimize the p

lbore saturations as well as on the reservoir permeability. We then demonstrate how these parameters and the base capillary number can ss interventions etc.) and quantitative information about reservoir parameters (e.g. permeability fracture length average reservoir pressu his is particularly true in the case when transient pressure data is from a PDG over a relatively long period of production time. Another well ctivity while reducing operating costs through an improved and more accurate well performance. These are achieved through analyzing the is strongly non-linear. Whereas different methods exist which allow us to approximate the solution of the real gas diffusivity equation a dual wells. For example dry oil production occurs from portions of reservoirs where the local water saturation is relatively high even though

of various artifacts collectively termed noise. While various noise-smoothing techniques have been used there are valid concerns that smo uced to single-phase inverse problems. During the last several years authors have been developing an alternative trend in well testing. I

the introduction of pressure derivative analysis in 1983 and the development of complex interpretation models that are able to account for d als generated by these transients were measured by arrays of permanent electrodes placed in the boreholes.The electrodes are partiall ue to loss of revenue and problems associated with crossflow or when bringing a well back on production. Moreover in case of commingled he interpretation model. Yet well test analysis results are usually reported as unique values often with unrealistic precision. Most well test of the multiphase flow meter (MPFM) are presented. Background on the West Brae field and the uses of the original MPFM will be discu ations or type curves based on simplified point source solutions. However it is impossible for these correlations or type curves to cover the o the pressure profile for an equivalent constant rate production sequence) has been in limited use as a "conversion" mechanism for the las

sis methods.In some cases it is possible to interpret the same test data in terms of larger radius of investigation. There are a numb ovel approach is taken to develop the analytical solutions and procedures for both liquid and gas wells. Approximate solutions for the early-

ssure transient test interpretation leads to better understanding of reservoir heterogeneities and boundaries and is the central theme of thi ssure transient test interpretation leads to better understanding of reservoir heterogeneities and boundaries and is the central theme of thi o provide methodologies for predicting and measurement of the size of waterflood-induced fractures. This contrasts to the vast amount of w

n drilled in an area interpreted to have high fracture density. A comprehensive test program including flowing and static pressure surve n drilled in an area interpreted to have high fracture density. A comprehensive test program including flowing and static pressure surve ered reservoirs without reservoir crossflow i.e. no significant vertical permeability between individual layers within the reservoir. The third ob n shown and accepted for years that real gas pseudo-pressure can be used to apply analytical solutions to transient radial flow. However i ow rates for each individual stage in a multi-fractured well 2) apply rate-transient solutions that use rate-normalized-pressures and superpo well. In this paper we have improved the accuracy of the transient well index approach and have provided for a flexible and easily impleme dividual layers. Greater Munga field of the Greater Nile Petroleum Operating Company (GNPOC) in Sudan has several wells that comming

methods yield only the effective permeability for the dominant flowing phase and the total mobility of all phases. The new method uses pressure behavior may be due to the presence of plugged perforations. Drilling problems associated with high mud losses when the well en beginning of a drawdown or injection) of a well. However the initial pressure propagation is not diffusive but it propagates like a wave with a al management dilemma. With the advent of digital oilfield technology the pressure and hence the deterioration in well deliverability can

artificial lift. A few months after first oil the field was consistently achieving production rates higher than predicted which led to a decision to ited with very few wells. This forces the oil companies to concentrate on high quality reservoirs that yield highly productive wells with large ited with very few wells. This forces the oil companies to concentrate on high quality reservoirs that yield highly productive wells with large al part of the well in addition to Magnetic Resonance. To achieve the best possible real-time wellbore placement reservoir navigation and c a single active well on the structure. It is ideally suited for analysis of the data from exploration and appraisal well tests. The previously men is. However there exists no study presenting an independent assessment of all these methods revealing and discussing specific features

ong been recognized as a reservoir characterization tool. Although welltest analysis is a recommended technique for fracture evaluation b uch as variations in operational conditions and steam saturation along the horizontal wellbores heat return rates and losses to the vertical h consisted of running a pressure/temperature memory gauge in a casing/casing annulus of a well and testing the well several times durin he paper also addresses how health safety and environmental considerations were handled. Traditional well testing methods and equipm we now find that flowing bottom-hole temperature detects interwell communication with interference delay times consistent with pressu number effects (close to the well). Condensate drop-out causes a non-reversible reduction in well productivity which is compensated in pa o understand such reservoirs. Another challenge presented by thinly bedded reservoirs is the presence of vertical heterogeneity and varying o understand such reservoirs. Another challenge presented by thinly bedded reservoirs is the presence of vertical heterogeneity and varying of wireline formation tester. A MiniDST transient sequence consists of a single or multiple flow periods induced using a downhole pump fo wells are often producing at high water-cuts thus leading to significant uncertainty on oil rates. To solve such metering challenges with a la wells are often producing at high water-cuts thus leading to significant uncertainty on oil rates. To solve such metering challenges with a la hallenges to the successful acquisition of well test data. The paper discusses the challenges and potential benefits of deployment in line mu

essure unstable flow these controlled conditions are far from reality which can lead to unforeseen errors in the field. Recent experience sho iphase flow meters have been proved for multiphase production metering by many operation companies worldwide. However in artic envir meter mostly liquid-rich flow streams. These models were not developed for the measurement of gas flow rates particularly those of wet gas ration and strategy. The program included in addition a set of elements to qualify the multiphase meters results before use and considered e of 85-92% following the type of technology. These criteria are often based on past experience or special cases which could be several ye

chniques was further developed for numerical well testing purpose in which production history reservoir heterogeneity multi-well interferen ms in heterogeneous reservoirs the traditional analytical approach based on the ideal reservoir conditions failed. An option to get an approx ulation has long been recognized. However only limited benefit could be obtained by reconciliation of the analytical well test model with the an be used to provide the characteristic signatures for unfractured and fractured wells. The purpose of this paper is to demonstrate the ap o periodically determine oil gas and water flows for accounting reporting and surveillance purposes. Hydrocarbon allocation provides offic ation description and evaluation have been adequately diagnose. However the approach is complex for non-mathematician and an alterna ation description and evaluation have been adequately diagnose. However the approach is complex for non-mathematician and an alterna

nalysis are the mobility and storativity ratios between the regions and the condensate-bank radius. For a given region however well-test a us ways to minimize the pressure drop in order to reduce liquid dropout and related problems. One solution implemented over the past deca

ase capillary number can be obtained from pressure-buildup data by using single-phase and two-phase pseudopressures simultaneously. average reservoir pressure skin wellbore storage etc). The study of pressure transient testing in one of the Iranian giant oilfields was init uction time. Another well testing method is to analyse transient flowing rate as a result of the constant well bottom hole flowing pressure. T ved through analyzing the long term real time dynamic transient pressure obtained from Permanent Down-hole Gauges (PDG) which will gas diffusivity equation all of these approximate methods have limitations (including numerical models). The purpose of this work is to pro elatively high even though the relative permeability data would predict a water cut in the range of 30 to 60%. This lack of agreement means

e valid concerns that smoothing procedures may adversely affect the well-test interpretation. In contrast measurements from new pressure ive trend in well testing. Its distinctive features are: creation of bi-directional two-phase flow in the near-wellbore region or forced creatio

at are able to account for detailed geological features well test analysis has become a very powerful tool for reservoir characterization. A ne The electrodes are partially insulated from the other completion components but nonetheless record high signal-to-noise ratio responses. Th er in case of commingled reservoirs conventional buildup provides only average values of permeability skin and pressure. An innovative precision. Most well test interpretation software programmes use non-linear regression to determine the reservoir parameters that provide original MPFM will be discussed. The challenges of monitoring and optimising a subsea field without any measurement at a well level a r type curves to cover the variety of scenarios found in the real world. In the recent years people start to use regression analysis to match ion" mechanism for the last 25 years. Unfortunately standard deconvolution techniques require accu-rate measurements of flowrate an

on. There are a number of specific issues of which one has to be aware when using pressure-rate deconvolution.In this paper we ate solutions for the early-time and late-time pressure behavior are derived from the rigorous solution and are used for developing the basis

is the central theme of this paper. Additionally seismic data can guide the design of pressure transient tests especially the test duratio is the central theme of this paper. Additionally seismic data can guide the design of pressure transient tests especially the test duratio ts to the vast amount of work that has been done for stimulation (e.g. propped) fractures. Injection Fall-Off (IFO) test analysis offers a chea

and static pressure surveys modified isochronal test two buildup tests and FloScan Imager (FSI) log has been carried out to evaluate th and static pressure surveys modified isochronal test two buildup tests and FloScan Imager (FSI) log has been carried out to evaluate th the reservoir. The third objective of this paper is to present a methodology for the analysis of high angle well pressure transient tests. This ent radial flow. However it has been noticed that analytical solutions can be in serious error when applied to transient linear flow. Specifical d-pressures and superposition-in-time to evaluate response accordingly to the fracture flow periods 3) estimate reservoir and fracture effec lexible and easily implementable approach to place multilaterals in conventional Cartesian-grid reservoir models. Introduction Pressure-tr everal wells that commingle production from the Aradabia Bentiu-2 and Bentiu-3 formations. These formations are highly variable in terms

es. The new method uses the surface flow rates and fluid properties of the flowing phases and the same relative permeability relations use d losses when the well encounters fractures often prevent well penetration of the total formation thickness. Penetration in naturally fracture pagates like a wave with a finite speed. If we have a pressure gauge at a distance we will only start to detect a pressure change (drop or in on in well deliverability can be continuously and cost effectively monitored. This paper illustrates how real-time data can be used to mak

d which led to a decision to enhance the application of early extensive reservoir engineering studies aiming to better understand the reservo roductive wells with large reserves per well. High costs prohibit extensive appraisal activity and drive development decisions based on v roductive wells with large reserves per well. High costs prohibit extensive appraisal activity and drive development decisions based on v reservoir navigation and continuous follow-up on the horizontal log interpretation was performed during drilling. For the first time a low grad tests. The previously mentioned deconvolution algorithm can not be used with the data that are acquired during startup and early field deve scussing specific features associated with the use of each method in a unified manner. The algorithms used in this study for evaluating the

e for fracture evaluation but its use is still not well understood. Analysis of pressure transient data provides dynamic reservoir properties su and losses to the vertical section above the target formation. This paper proposes a new technique to estimate cooling time and formation e well several times during a 3-month period after which the gauge was retrieved and the data were read out. First of all comparison of t ting methods and equipment have evolved over the years adapting to changing requirements. This has resulted in requirements for more c es consistent with pressure transient analysis and can be used to estimate interwell permeability. To explain our observations we propo hich is compensated in part by capillarity number effects. All these effects can be identified and quantified from well test data. Tests in con heterogeneity and varying layer flow properties. Wireline formation testers have been commonly used to acquire formation pressures pres heterogeneity and varying layer flow properties. Wireline formation testers have been commonly used to acquire formation pressures pres using a downhole pump followed by a pressure buildup. The objectives of a MiniDST are sampling estimation of reservoir properties such a tering challenges with a large majority of their wells operating above 95% gas fraction under metering conditions and water cuts often highe tering challenges with a large majority of their wells operating above 95% gas fraction under metering conditions and water cuts often highe s of deployment in line multiphase flowmeters in the difficult operating environment of Northern Siberia. The reduced logistics and the abili

ld. Recent experience shows that in certain conditions the various types of multiphase flowmeters react quite differently to the measureme de. However in artic environmental conditions like those of Yamburgskoe gas-condensate field with low ambient temperature and producti articularly those of wet gas. A new interpretation is described that allows a traditional multiphase flowmeter to operate in a dual mode either efore use and considered parallel testing with conventional separators to allow fair comparison of results. More than 50 wells were tested d which could be several years old. A split in terms of naming is even commonly accepted in the multiphase business between Multiphase F

eneity multi-well interference as well as oil-water two phase flow problems were all considered. Streamline well testing model was develope An option to get an approximate solution for the problem is to solve the non-linear pressure diffusivity equation through well test numerical m al well test model with the numerical full-field model. We present a more complete approach where a more integrated approach using a com r is to demonstrate the application of the production data" formulation of the -derivative function (i.e. the -integral derivative) for the purp n allocation provides official reports of well and reservoir production for lease owners petroleum revenue tax purposes and management hematician and an alternative method for improving its interpretation and reducing the difficulty of its practical application havent been d hematician and an alternative method for improving its interpretation and reducing the difficulty of its practical application havent been d

gion however well-test analysis cannot uncouple the storativity ratio from the region radius and the storativity ratio must be estimated inde mented over the past decade is the use of horizontal wells. There is a lack of published knowledge on the flow behavior of horizontal wells

ressures simultaneously. These parameters can in turn be used to estimate gas relative permeability curves. Finally we illustrate this appro nian giant oilfields was initially undertaken to estimate important well and reservoir flow parameters and characterize heterogeneities in the m hole flowing pressure. The method is so-called decline curve analysis. However in reality because of production constraints or changes i Gauges (PDG) which will provide input and vital information for improving the existing reservoir model for flow simulation. Reservoir monit rpose of this work is to provide a direct solution mechanism for the case of time-dependent real gas flow which uses an approach that comb lack of agreement means that effective reservoir management is hampered because it is difficult for simulation models to mimic the observ

ements from new pressure gauge systems can now provide the stability and resolution required to characterize/quantify complexities of the re region or forced creation of two- or three-phase fluid flow; interpretation of well test results based on 1D 2D or 3D multiphase optimiz

rvoir characterization. A new milestone has been reached recently with the introduction of deconvolution. Deconvolution is a process which o-noise ratio responses. These field experiments have demonstrated that the streaming potentials arising from pressure transients can be m d pressure. An innovative periodic well testing technique named WTPL (Well Testing by Production Logging) has been developed in which r parameters that provide the best match between actual rate and pressure data and a given interpretation model. The non-linear regressio surement at a well level and the benefits associated with well testing are presented. The five phases used to optimise this six producer ression analysis to match the responses at the source interval and the observation point. With regression analysis we face the problem of n asurements of flowrate and pressure at downhole (or sandface) conditions. While accurate pressure measurements are commonpla

tion.In this paper we identify and discuss these issues and provide practical considerations and recommendations on how to produce c d for developing the basis for the straight-line analysis. A derivative function is utilized to ascertain if the data contains any portion of reserv

especially the test duration to evaluate key seismic anomalies. Other data such as production history core data formation evaluation fr especially the test duration to evaluate key seismic anomalies. Other data such as production history core data formation evaluation fr test analysis offers a cheap way to infer the dimensions of induced fractures from welltests. This paper presents a new methodology fo

carried out to evaluate this well. The material discussed in this paper provides a good basis for evaluating long-term production potential o carried out to evaluate this well. The material discussed in this paper provides a good basis for evaluating long-term production potential o ssure transient tests. This paper compares the high angle and horizontal well solutions showing Cincos slant well solution is valid prov sient linear flow. Specifically the slope of the departs from the analytical value as the flow rates or degree of drawdown become higher. Th eservoir and fracture effective properties and 4) evaluate the completion efficiency. The field examples presented in the paper demonstra Introduction Pressure-transient responses of wells are conventionally analyzed and interpreted by using analytical solutions of diffusion e e highly variable in terms of the reservoir properties oil types and pressure regimes. A selective inflow performance (SIP) test was carried

permeability relations used in characterizing the reservoir and predicting its future performance. The method has been verified by comparin tration in naturally fractured reservoirs is usually minimal (10 to 20%) but with the right mud it can reach 50% and in some cases 100%. ressure change (drop or increase) after a few seconds or minutes even if we have a perfect pressure gauge with 0.0 psi resolution. After th e data can be used to make decisions on when to invest in pressure transient tests and when a test is run how to minimize the downtime.

er understand the reservoir mechanism volumes in place and their implications for field depletion plans. Data from permanent pressure ga ment decisions based on very few wells. Whilst these limited penetrations are often logged extensively using modern formation evaluati ment decisions based on very few wells. Whilst these limited penetrations are often logged extensively using modern formation evaluati For the first time a low gradient Magnetic Resonance (MR) while drilling technology was deployed in a virgin carbonate horizontal well on th tartup and early field development that normally involve several producing wells. The paper describes a generalization of deconvolution to m s study for evaluating the von Schroeter et al. and Levitan methods represent our independent implementations of their methods based on

mic reservoir properties such as average permeability fracture storativity and fracture conductivity. An infusion of geological knowledge help cooling time and formation thermal diffusivity by using thermal transient analysis (TTA) along the horizontal wellbore under a steam heating First of all comparison of the magnitude of the observed annular pressures with the burst and collapse ratings of the casings shows that ann in requirements for more complex data gathering over a shorter time with much stricter environmental and safety constraints. Coupled with our observations we propose that FBHT responds to the impact of pressure changes. The principal result is a change in the producing GOR well test data. Tests in condensate reservoirs however tend to be difficult to interpret. Build-up and/or drawdown data are usually dominate formation pressures pressure and reservoir fluid samples for a number of decades. Many hardware technologies and interpretation metho formation pressures pressure and reservoir fluid samples for a number of decades. Many hardware technologies and interpretation metho reservoir properties such as permeability (k) skin(s) radial extrapolated pressure (p*) and estimating AOFP. AOFP is an important gas wel and water cuts often higher than 90 % TOTAL ABK has evaluated different well testing & monitoring strategies based on multiphase meter and water cuts often higher than 90 % TOTAL ABK has evaluated different well testing & monitoring strategies based on multiphase meter uced logistics and the ability to monitor in real time the true evolution of the gas and condensate wells provide an in-depth view of the actua

erently to the measurement challenges of transient flows in high water cut and high gas volume fractions (GVF). Some meters can be u temperature and production rate regulation restrictions this process had to be revalidated and the operational capabilities confirmed with a rate in a dual mode either as a multiphase meter or as a wet-gas meter in 90 to 100% gas. The new interpretation model was developed fo han 50 wells were tested during this campaign. All these wells were selected carefully to represent anomalies that need to be investigated fo ess between Multiphase Flow Meter and Wet Gas Meter. With the recent dedicated Gas Mode developed by Schlumberger it is now possi

sting model was developed to analyze pressure draw down and build up under these field conditions. In the developed well testing mathem ough well test numerical modelling and simulation. Well test analysis and interpretation conducted on this basis is called numerical well test ated approach using a common model is advocated. . The benefits of such a workflow can be summarized as follows: Improve ral derivative) for the purpose of estimating reservoir properties contacted in-place fluid and reserves. Our main objective is to introduce a rposes and management reports as well as feeding into hydrocarbon reserve figures and reservoir simulations which are used for major fie ication havent been discovered most especially where there is inconsistency in data sampling. The statistical approach (VEMST) utiliz ication havent been discovered most especially where there is inconsistency in data sampling. The statistical approach (VEMST) utiliz

tio must be estimated independently to obtain the correct bank radius. In most cases the storativity ratio is calculated incorrectly which exp ehavior of horizontal wells in gas/condensate reservoirs. The limited studies in this area (Muladi and Pinczewski 1999; Dehane et al. 2000;

ally we illustrate this approach with both simulated pressure-buildup data and an actual field case. Introduction and Background In gas/con ize heterogeneities in the Fn limestone formation; However during the course of interpretation numerous engineering complexities were en n constraints or changes in operating procedures the down-hole flowing pressure seldom remains at a constant level over a long period of mulation. Reservoir monitoring during field development can amplify the understanding of the reservoir depletion compartmentalization an es an approach that combines the so-called average pressure approximation (a convolution for the right-hand-side nonlinearity) and th models to mimic the observed reservoir production without use of data that may bear little resemblance to measurements. After a brief discu

uantify complexities of the well/reservoir system which may otherwise have gone unnoticed. In this paper we endeavor to reconcile the adv or 3D multiphase optimization problems. Obviously in this case well testing techniques are rather more complicated. They become scie

olution is a process which converts pressure data at variable rate into a single drawdown at constant rate thus making more data available essure transients can be measured accurately under borehole conditions.Numerical methods have been developed to interpret these m s been developed in which a cyclic wave function is imposed in the wellbore by modulating the flowrate. The analysis of the acquired rate fu . The non-linear regression evaluates the match quality as a standard correlation between each parameter. This however only estimates t optimise this six producer well system are detailed along with the economic benefits seen. These economic benefits are compared to t s we face the problem of non-unique solutions. Sometimes an estimated permeability is outside a reasonable range when analyzing noisy surements are commonplace the measurement of sandface flowrates is rare essentially non-existent in practice. As such the "deconvolu

ations on how to produce correct deconvolution results.We also demonstrate reliable use of deconvolution on a number of real test exam tains any portion of reservoir-dominated flow. Two synthetic data examples are presented to illustrate the process. Important contributi

ata formation evaluation from well logs analog information on channel geometry etc. is also important in getting a better understanding of r ata formation evaluation from well logs analog information on channel geometry etc. is also important in getting a better understanding of r nts a new methodology for IFO test analysis of fractured waterflood wells. This methodology derives the dimensions of induced fractures a

erm production potential of horizontal wells exploiting tight and thin reservoirs with reservoir pressures close to the bubble-point pressure. erm production potential of horizontal wells exploiting tight and thin reservoirs with reservoir pressures close to the bubble-point pressure. t well solution is valid provided the bed is sufficiently thick. As a practical matter the standard horizontal well is rare. Most of the horizontal w down become higher. This paper demonstrates the rate/drawdown sensitivity of transient linear flow. Then a correction factor is presented d in the paper demonstrates the application of the production optimization methodology in practice. The approach permits quantification of cal solutions of diffusion equation for relatively simpler reservoir architectures. For more complex reservoir situations involving multi-phase ce (SIP) test was carried out during production logging (PL) jobs in some of these wells and it indicated that the productivity index (P.I.) of t

been verified by comparing the results from analyzing several synthetic tests that were produced by a numerical simulator with the input va d in some cases 100%. Such well completions are referred to as limited-entry restricted-entry or partially penetrating wells. The transie 0.0 psi resolution. After the initial propagation pressure starts to diffuse or propagates as diffusion and we start to observe pressure chang o minimize the downtime. The case studies presented here are for wells on electrical submersible pumps in various types of reservoirs a

om permanent pressure gauges installed in the two open-hole gravel-packed horizontal producers was analysed to improve understanding modern formation evaluation tools the acquired static data cannot confirm that the wells will drain sufficient reserves. Evaluation of reservoi modern formation evaluation tools the acquired static data cannot confirm that the wells will drain sufficient reserves. Evaluation of reservoi onate horizontal well on the Norwegian Continental Shelf. The MR Service was run to obtain porosities (incl. partitioning of movable and bou ation of deconvolution to multiwell pressure and rate data. Several approaches and ideas for multiwell deconvolution are investigated and e f their methods based on the material presented in their papers not the original algorithms implemented by von Schroeter et al. and Levita

geological knowledge helps reducing uncertainty associated with any well-test interpretation. The static properties of naturally fractured res ore under a steam heating process. A novel concept of a heating ring is also introduced to measure the heat storage in the heated bitumen he casings shows that annular pressure buildup is a serious consideration in casing design. Such design is to be based on theoretical mod constraints. Coupled with increased needs for more accurate reservoir data for prospect evaluation this has put a higher emphasis on upfr nge in the producing GOR which in turn depends on the speed and magnitude at which a pressure change is transmitted through the rese data are usually dominated by wellbore phase redistribution effects and the main analysis challenge is to distinguish between reservoir effe s and interpretation methods have been developed to acquire better quality reservoir information. Dual packer wireline formation testers offe s and interpretation methods have been developed to acquire better quality reservoir information. Dual packer wireline formation testers offe FP is an important gas well flow parameter and is used to determine the commerciality of discovered prospects. We use a two step approac ased on multiphase metering use. A compact dual-energy gamma-ray Venturi multiphase flow meter (MPFM) was selected and placed und ased on multiphase metering use. A compact dual-energy gamma-ray Venturi multiphase flow meter (MPFM) was selected and placed und n-depth view of the actual well performance. The evolution of the real dynamics of the wells stabilization after a change of choke can be ob

Some meters can be unreliable in measuring oil rates in certain conditions which leads to inaccurate estimation of the wells' potential an pabilities confirmed with all of the logistical challenge of this environment. A number of recommendations to prevent and mitigate the impac n model was developed for a commercially available multiphase flowmeter consisting of a venturi and a dual-energy composition meter. Th need to be investigated for possible proactive actions. Some of these wells were tested more than once to qualify and validate the product lumberger it is now possible to test both gas and oil wells with the same hardware. The focus put in the past few years on a combination o

eloped well testing mathematical models along each streamline equations were solved all together numerically to derive transient pressure called numerical well testing. This technique has been proved through study and research in the past few years to be an effective way to ows: Improved well test interpretation by using simulation models that have been built using geological geophysical petro-phy objective is to introduce a new practical tool for the analysis/interpretation of the production data using a new diagnostic rate and pressure d hich are used for major field decisions e.g. where to drill the next out-step well. Surveillance is key to determining well and reservoir behav al approach (VEMST) utilized simple statistical tools such as StatDiff StatDev and StatExp derived from time series analysis to identify pos al approach (VEMST) utilized simple statistical tools such as StatDiff StatDev and StatExp derived from time series analysis to identify pos

ated incorrectly which explains why condensate bank radii from well-test analysis often differ greatly from those obtained by numerical com 999; Dehane et al. 2000; Harisch et al. 2001) focused on well performance rather than on well-test behavior. There has been no evidence o

nd Background In gas/condensate reservoirs a condensate bank forms around the wellbore when the bottomhole pressure (BHP) falls bel ering complexities were encountered due to the nature of well behavior and reservoir conditions led to the masking of the actual reservoir re evel over a long period of time. Deconvolution is a technique which can be used to convert measured transient pressure due to variable s compartmentalization and efficiency of water injection also the presence of any flow barriers (such as activated fault). On this basis reser de nonlinearity) and the Laplace transformation. For reference Mireles and Blasingame used a similar scheme to solve the real gas ements. After a brief discussion of relative permeability the focus of this paper is first to examine the uncertainties in the data that are used

eavor to reconcile the advances in well-test interpretation and in measurement technology. Specifically we describe a new technique for d icated. They become science-intensive. On the other hand they firstly extend the list of parameters and relations determined - those requ

aking more data available for interpretation than in the original data set where only periods at constant rate can be analyzed. Consequently loped to interpret these measurements to offer distributed characterization of matrix permeability at various depths of investigation and effe ysis of the acquired rate function and the resulting pressure wave then provides formation characteristics such as permeability and skin in th however only estimates the match errors and does not incorporate the other errors that must be accounted for to understand the overall u benefits are compared to the economic case used to justify the replacement of the original MPFM. Introduction Subsea fields tied back to e nge when analyzing noisy data from real tests. In a wireline vertical interference test we perform a drawdown test followed by a buildup tes As such the "deconvolution" of wellbore storage distorted pressure test data is problematic in theory this process is possible but in p

a number of real test examples. Introduction Evaluation and assessment of pressure transient behavior in well-test data normally begins w . Important contributions made in this study are as follows: The analysis procedure is simple enough to implement in a spreadsheet

better understanding of reservoir description. While we briefly discuss all relevant data the focus of this paper is primarily on integrating se better understanding of reservoir description. While we briefly discuss all relevant data the focus of this paper is primarily on integrating se ns of induced fractures and the extent to which these are contained to the target injection layer. Furthermore the paper focuses on the app

e bubble-point pressure. Test data interpretation highlights successful development of inflow and tubing performance relationships bubble e bubble-point pressure. Test data interpretation highlights successful development of inflow and tubing performance relationships bubble re. Most of the horizontal wells drilled in the Gulf of Mexico (GoM) are better approximated by the deviated well model because they transec ection factor is presented which corrects the slope of the plot and improves the accuracy of and OGIP as calculated from production/press h permits quantification of the reservoir and fracture properties on a layer-by-layer or frac stage-by-stage by evaluating the production well ons involving multi-phase flow and reservoir heterogeneity numerical simulation is usually the only resort. Numerical simulators generally f roductivity index (P.I.) of the individual layers varies widely ranging from 1.5 to 15 b/d/psi. This illustrated the need for a method to estimat

simulator with the input values. Use of the method with field data is also described. The new method could be applied wherever values of a etrating wells. The transient flow behavior in these types of completions is different and more complex compared to that of a fully penetratin o observe pressure change at a given space and time above the pressure gauge resolution and natural background noise which could be a arious types of reservoirs across Latin America. The paper briefly discusses the three pillars of digital oilfield; technology processes and pe

o improve understanding of the reservoir. Average reservoir pressure productivity index and connected volume were interpreted from build ves. Evaluation of reservoir connectivity over large distances from the well requires relatively long and expensive well tests. In this paper w ves. Evaluation of reservoir connectivity over large distances from the well requires relatively long and expensive well tests. In this paper w oning of movable and bound fluids) HC saturations and permeability estimates. Fluid saturations based on traditional methods and the MR tion are investigated and evaluated. The paper presents the results of this investigation and demonstrates performance of the deconvolutio Schroeter et al. and Levitan. Three synthetic cases and one field case are considered for the investigation. Our results identify the key issue

s of naturally fractured reservoirs such as fracture distribution fracture aperture matrix block size and fracture porosity can be obtained from ge in the heated bitumen at the time of testing. Heating ring can be considered analogous to a drainage area in a conventional pressure tra based on theoretical models for annular pressure buildup. The data acquired with the test serve to validate these models. The data demon a higher emphasis on upfront planning and improved technical performance together with extensive use of advanced fluid data gathering m nsmitted through the reservoir. The effect is pronounced when flowing pressures are below bubble-point and compounded by Chirags ish between reservoir effects boundary effects fluid behavior and wellbore phase redistribution perturbations. The paper compares theore eline formation testers offer an alternative an additional way to selectively straddle a section of a reservoir and provide the capability to cond eline formation testers offer an alternative an additional way to selectively straddle a section of a reservoir and provide the capability to cond e use a two step approach in establishing commingled AOFP of gas wells. First we conduct a multiple station MiniDST run and interpret th s selected and placed under fi