GNwafor WellBond Cement System Design

WELBOND Cement Systems Design

Godwin Nwafor, Weston Brew, Atif MalikSD-1 #71108, MLC UAE

Schlumberger Private

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Outline

Company Overview Schlumberger/Cementing Services

Objectives

Well Data

Quality, Health, Safety & Environment (QHSE)

Safe Operation Management Tools

Sequence of Operation

Logistics & Contingency Plans

Conclusion


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Company Overview, Schlumberger Cementing Services

Schlumberger is the leading oilfield services provider, trusted to deliver superior results and improved E&P performance for oil and gas companies around the world.

Cementing supports and protects well casings. Schlumberger’s high-quality cementing solutions are based

on: Best practices Environmentally sound wellsite operations Innovative technologies with safety as the highest priority


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Objectives

WELBOND Cement Systems are developed to improve

zonal isolation through improved bonding.

To improve the cement-to-pipe and cement-to-formation

bonds by their fluid-loss control and adhesion properties.

Extremely low permeability when set prevents any fluid

movement behind the casing

Good Isolation up to liner lap


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Well Data Client: MLC Oil & Gas Well: MLC-1 Field: Shamkha Total MD: 12,000ft BHST: 250degF BHCT: 215degF Bit Size: 8 ½”

10.750 in Csg51.00 lbm/ft710 ft

9.625 in Csg47.00 lbm/ft6230 ft

9.625 in Csg53.50 lbm/ft9150 ft

8.500 in10% Excess12000 ft

Float Collar11920 ft

5.000 in DP19.50 lbm/ft8650 ft

7.000 in Csg32.00 lbm/ft12000 ft

Top of Cement8600 ft

Liner Hanger8650 ft

Shoe12000 ft

i- Handbook* - *a mark of Schlumberger

Created on 2/8/2012 9:37:59 PM


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Quality, Health, Safety & Environment (QHSE) Quality, Health, Safety and Environment (QHSE), is the four

(4) business and operational attributes controlled by the Schlumberger Management System

Applicable WS QHSE Standards: WS Std 001 – Service Delivery WS Std 003 – Maintenance WS Std 005 – Wellsite Operation WS Std 018 – Chemical Product Management


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QHSE contd … WS Std 023 – Testing & Inspection of Treating Equipment WS Std 30 – Mixing & Pumping of Combustible & Flammable

Fluid MSDS – Material Safety Data Sheet


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Safe Operation Management Tools Key Service Quality Requirement (KSQR ) i-District: A custom resource management system for use in

district operations (Job ID: 722655) JRI: Service Quality Job Risk Index identifies individual Service

Quality risk and the overall risk of the job. It must be completed prior to job starts.

Hazard Analysis & Risk Control (HARC): A process used in Schlumberger for Quality and HSE risk management, designed to analyze risk(s) prior to performing activities and to define risk control measures in order to reduce the risk.

Management of Change (MOC) – QUEST No: 20120211060327


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Fluid Placement & SequenceFluid Name Volume (bbl) Density (Ib/gal) Rate(bpm) Time (min)

MUDPUSH II 30.0 13.0 6.0 5.0

WELBOND Slurry

87.8 16.0 6.0 14.5

Stop, Drop Dart 10.0

Mud 118 10.5 5.0 23.5

MUDPUSH II 9.5 13.0 5.0 2.0

MUDPUSH II 2.0 13.0 2.0 1.0

Mud 140.2 10.5 5.0 28.0

Mud 2.0 10.5 2.0 1.0

Thick. Time 5 hrs


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Chemical/AdditivesBased on calculations, the required additives for WelBOND Slurry:

Additive Description Concentration QuantityFresh Water Base Fluid 3.261 gal/sk 35.5 bbl

Cement Class G 94 Ib of Blend 457sk 19.5 Mton

D175A Antifoam 0.03 gal/sk 13.7 gal

D801 Retarder 0.01 gal/sk 4.6 gal

D080A Saltbond II 0.07 gal/sk 32 gal

D135 GasBlok Stab 0.10 gal/sk 45.7 gal

D600 GasBlok 1.50 gal/sk 685.7 gal


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Chemical/AdditivesBased on calculations, the required additives for MUDPUSH II:

Additive Description Concentration Quantity

Fresh Water Base Fluid82.60%

H20/Spacer (vol) 34.3 bbl

D182 Spacer Concentrate 3.000 Ib/bbl 124.5 Ib

D047 Antifoam 0.010 gal/bbl 0.42 gal

D031 Weight Agent (Barite) 254.4 Ib/bbl 10, 557.6 Ib


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Sequence of Operation Safety Meeting Rig up Pressure test line @ 2000 psi Pump MUDPUSH II: 30 bbl @ 6 bpm (13 ppg) – Spacer Ahead Pump WelBOND Slurry: 87.8 bbl @ 6bpm (16 ppg) Stop & Drop Dart Pump NaCl/KCl Mud: 118 bbl @ 5 bpm (13 ppg) Pump MUDPUSH II: 11.5 bbl @ 5 bpm (Spacer Behind), slow

down to 2 bpm the last 2 bbl to shear the Liner Wiper Plug Pins Pump NaCl/KCl Mud: 142.2 bbl @ 5bpm, slow down to 2 bpm

the last 2 bbl to bump the Liner Wiper Plug


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Sequence of Operation … Bump Plug/Check for returns Release Running Tool, POOH above TOC and reverse

circulate out any excess cement


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Logistics The required logistics and planning for the job include:

Personnel required for the job Chemicals Equipment


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Personnel/Crew Requirements include: Crew is current on relevant QHSE (SLB & WS) Job supervisor (JS) and pump operators have done the

same or similar type jobs previously, and/or have completed training and are deemed competent by line management (LM)

Personnel trained and competent for the job Crew Composition: 1 Job Supervisor & 1 Operator


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EquipmentThe required equipment for the job: CPS 361, Mixing System & Surge Can Batch Mixer Treating Equipment (High & Low Pressure) Liquid Additive System (LAS) & Air Transfer Pump Rig up in compliance with SLB QHSE, WS QHSE Standards

and WS Alerts Equipment is prepared & current on STEM


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Equipment contd…

Liquid Additive System

Batch Mixer

Cement Pump Skid CPS 361

Cement Silo Capacity: 1 x 1000ft3

(Rig-Provided)


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Contingency Plans Injury/Emergency: Call rig Medic, assess the injury, if

serious call MediVAC; Maximum Shutdown time: 2hrs Loss of triplex pump: Immediately shutdown the defected

triplex pump and switch to the second triplex pump If the Batch Mixer goes down, we fly mix the WELBOND

slurry If plug doesn’t bump, pump half the volume of the shoe track If the C-Pump goes down, we use the backup


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Conclusion High quality zonal isolation allows more accurate well testing to

define the reservoir,

Maximizes recovery at the least cost

Provides more effective stimulation through placement focused

on the reservoir,

Provides more effective enhanced recovery and reduced

abandonment costs.


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Questions & Comments!!!

Documents

GNwafor WellBond Cement System Design