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EDPMSEXACT DOWNHOLE PRESSURE
MONITORING SYSTEMREVIEW
BY DODY JUNIZED 3-JANUARY-09
ANALIST BY YOYON KURNIAWAN
4-JANUARY-09
STARLUCK
EDPMS History EDPMS technology can be traced back to the use of Manometers/Bathometers starting as early as 1863. In 1903 a patent was found where ships use a device called a Bathometer to determine the sea floor depth. 1928 patent for apparatus for indicating the depths of liquids. 1957 Apparatus for determining static pressure in pumping wells 1969 Instrument for gauging liquid depth 1973 Original EDPMS patent from Sperry Sun
STARLUCK
Bathometer Patent 1863 & 1903
• 1972 Initial EDPMS installations were installed in Texas by Sperry Sun for Shell and others.• 1975 Sperry Sun started running retrievable EPDMS’s.• 1981 Pruett Industries started running retrievable EDPMS’s in Geothermal wells • 1981 Pruett licensed EPDMS’s patent from Sperry Sun• 1983 Pruett started installations of EPDMS’s in offshore applications.• Sperry Sun and Pruett Industries were the only true competitors in this business.
EDPMS History STARLUCK
1973 First commercial sale of EDPMS from Sperry Sun. Using a Chamber 1975 Method of Apparatus for measuring pressure related in a borehole. Using Gas and a Chamber Sperry Sun 1990 Patent for combining Temperature and EDPMS measurement. (Tube inside of tube only.) 1992 Same as above but the addition of DTS (Tube inside of tube only.)
EDPMS History STARLUCK
Sperry Sun & Star-luck Development•Pressure chamber•Continuous capillary tubing roll. No splices•Data logger at surface•Gas weight calculation to correct for true BHP•Use of helium gas •Expandable chambers•Retrievable systems•Concentric chambers Utilizing quartz pressure transducers•Development of an advanced Data Logger•Development of stronger .125” tubing specifically for EDPMS user •Surface instrumentation with data transmission•Automatic purge systems•Removable drum wireline units
•An economic alternative method to electronic gauges for the monitor of down hole pressures
•Uses a gas filled capillary tube to convey bottom hole pressure to surface monitor •STARLUCK has applied this proven technology for 40 nearly years
What is EDPMS? STARLUCK
No Electronics No Moving Parts
EPDMSEXACT DOWNHOLE PRESSURE MONITORING
SYSTEM
Capillary Tubing Theory
GAS
PressureMonitoring Equipment
Pressure Chamber
Chamber Ports
Capillary Tubing
Pack-Off
Capillary tubing theory is based on a closed system
at the top and an open system on bottom. Such as
covering a straw and pushing down into fluidVery little fluid enters the straw and a force is exerted at the top of the
straw
Without a seal at the top, fluid enters to the same
height as outer fluid level and no force is exerted at the top
Capillary Tubing Theory
GAS
PressureMonitoring Equipment
Compressed Gas Pressure in System to
Monitor BHP
Well Bore Gas
Pressure
Well BoreFluid Pressure
+
=
Gas is bubbled over and the fluid level
inside the system is pushed to the bottom of the
chamber
After the gas has equalized with the
BHP, the injection of gas is stopped
Gas Movement Inside Chamber
When Pressure Drops To Lowest Point
Chamber Is Full Excess
Gas Escapes
When Pressure Increases
Fluid Rises In Chamber. Our Goals Is To Not Let Fluid Enter
the Capillary Tubing
Gas Correction
STARLUCK
Capillary Tubing Theory
GAS
PressureMonitoring Equipment
Gas Weightneeds to be corrected
for.This calculation uses
TVD and Temperature.
Gas correction example.Uncorrected BHP 1000 PSI
Weight of Gas 20 PSITrue BHP 1020 PSI
Gas Correction Factors• Gas weight will change with temperature and
pressure• Gas correction uses True Vertical Depth (TVD) of
the chamber not the Measured Depth (MD) • Helium is used whenever possible as the system
gas• Helium has a liner compressibility with
temperature and nitrogen does not.• Nitrogen is approximately 7 times the weight of
helium
STARLUCK
PTS-DTS
Pwf = Pg + TVD * PHe(P,TDTS)
Pwf
TVD
Capillary Tube + FiberTubeTM
Surface Equipment
PHe
Pg
Gas Correction with and without DTS
• With DTS we can use real time temperature changes to correct for the weight of the gas column
• If no DTS system is used, we must use an average temperature to correct for the weight of the gas.– The average temperature can be derived from
previous surveys or by logging well with a temperature tool.
– The corrected pressure can be derived thought post processing of the raw data.
Gas Corrections Example Helium
This shows the difference if we corrected the pressure assuming an average temperature of 170 deg F but the actual temperature was 120 deg FTVD 9000 ft
Raw Pressure PSI
Average Temp Deg F
CorrectedPressure
Difference in PSI if not corrected for changing
temp500 170 518.3500 120 519.9 -1.6
1500 170 1552.11500 120 1556.4 -4.33000 170 3096.93000 120 3104.1 -7.2
Raw Pressure PSI
Average Temp Deg F
Corrected Pressure
Difference in PSI if not corrected for temp changing
500 170 649.7500 120 666 -16.3
1500 170 1962.61500 120 2022.8 -60.2
3000 170 3969.23000 120 4132.1 -162.9
Gas Corrections Example Nitrogen
This shows the difference if we corrected the pressure assuming an average temperature of 170 deg F but the actual temperature was 120 deg FTVD 9000 ft
Response Times
STARLUCK
Gas Correction ProgramChamber Depth 20,000 ft.Well Depth 20,500 ft.TVD Well Depth 20500 ft.Surface Pressure 1,500 psi
Corrected BHP 1598.6 psiFluid Corr. BHP 1598.9 psi
Outer Pipe ID 3.75 in.Inner Pipe OD 3.5 in.Length 24 ft.Top of Chamber 19976 ft. GeothDepth 1 0 ftChamber Relative ID 1.3462912 in. GeothDepth 2 20200 ftChamber Volume 409.977841 cu. Inches GeothTemp 1 70 deg F
GeothTemp 2 350 deg FPurge Fluid 1 1=Helium, 2=Nitrogen GeothGrad 0.013861 deg F/ftFluid Intake Gradient 0.1 psi/ft
Flowing Grad 0.0035 deg F/ftAvg Prod Entry 20000 ft-MD
Tubing OD 0.125 in. Prod Entry TVD 20000 ftWall thickness 0.0355 in. Prod Temp 347.2277 deg FTubing ID 0.054 in.Fiberrod, Fiber or Internal Tube O.D. 0 in. Well Depth 20500Effective remaining ID (with something in ID) 0.054 in. Kick-off Point 0 0.5Total tubing Volume 548.993467 cu. Inches Build Angle 0 Deg/100 ft MD
Hold Angle 40 DegMD Interval 150 ft.
Average Temp Calculated 300
300
Deviation Survey Parameters
Well Parameters
Chamber Configuration
Capillary Tubing
Geothermal Gradient
Flowing Temp Gradient
"Press"Set Current Pressure as Minimum
STARLUCK
Response Times
• Larger I.D tubing has a faster response time• The longer the tube the slower the response
time• Tubing size needs to be based on the customers
requirements for the application. If the customer needs a fast response time then a larger I.D tube should be installed…. If possible based on pressure changes and chamber size.
STARLUCK
Response Times STARLUCK
1/8” Tubing Response Test
TUBING DELAY TEST
0
500
1000
1500
2000
2500
3000
3500
4000
4500
16:48:00 18:00:00 19:12:00 20:24:00 21:36:00 22:48:00
TIME
PRES
SUR
E (P
SIA
)
DownholeSurface w/13,800 ftSurface w/6,000 ft
STARLUCK
1/8” Tubing Response TestLow Pressure --- Increasing
TUBING DELAY TESTIncrease Step 1
500
700
900
1100
1300
1500
19:01:55 19:09:07 19:16:19 19:23:31 19:30:43
TIME
PRES
SUR
E (P
SIA
)
DownholeSurface w/13,800 ftSurface w/6,000 ft
STARLUCK
1/8” Tubing Response TestMedium Pressure --- Increasing
TUBING DELAY TESTIncrease Step 3
2400
2600
2800
3000
3200
3400
3600
20:05:17 20:08:10 20:11:02 20:13:55 20:16:48 20:19:41 20:22:34
TIME
PRES
SUR
E (P
SIA
)
DownholeSurface w/13,800 ftSurface w/6,000 ft
STARLUCK
1/8” Tubing Response TestMedium Pressure --- Decreasing
TUBING DELAY TESTDecrease Step 1
2300
2500
2700
2900
3100
3300
3500
3700
3900
20:31:55 20:32:38 20:33:22 20:34:05 20:34:48 20:35:31 20:36:14 20:36:58
TIME
PRES
SUR
E (P
SIA
)
DownholeSurface w/13,800 ftSurface w/6,000 ft
STARLUCK
1/8” Tubing Response TestLow Pressure --- Decreasing
TUBING DELAY TESTDecrease Step 3
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
20:52:48 20:53:31 20:54:14 20:54:58 20:55:41 20:56:24 20:57:07 20:57:50 20:58:34
TIME
PRES
SUR
E (P
SIA
)
DownholeSurface w/13,800 ftSurface w/6,000 ft
STARLUCK
Type of Test Typical Suitable Tubing
Seconds .152” I.D. Minutes .152” & .069 I.D. Hours .152”, .069, & .054” I.D.
0 60 1209030 150 10 0 0 0 6 1293 15 18 21 24 0 6 1293 15 18 21
2500
2500
2500
2500
2500
2500
2500
2500
2250
2000
1750
1250
1250
1000
1000
2500
2250
2000
1750
1500
1250
1000
STARLUCK
Break 10 Minutes
Tubing Advantages
• Standard .125” tubing with .054” I.D– Less chamber volume– Easier to protect– Less gas required– Flow rate through the smaller I.D for safety reasons
• Standard .250” Tubing– Faster Response times– Availability– Less chance of plugging
STARLUCK
System Accuracy
STARLUCK
System Accuracy• System accuracy is based on correction of gas weight, transducer
accuracy and the fluid level change in the chamber.
• Gas weight calculations are as accurate as we are to knowing the average temperature.
• Transducer accuracy is based on the type of transducer that is installed.
• System resolution in general is .02 to .05 PSI
STARLUCK
• Quartz Transducer.– Manufacture: Quartzdyne– Accuracy of ± 0.015%FS to 0.02%FS– Resolution of 0.01 psi– Drift
• At surface temperatures (< 85°C) .001 % FS/yr• 150 to 200 C ,02% FS/yr
• Strain Gauge– Manufacture: Druck– Accuracy of ± 0.04% FS– Combined Non-linearity, Hysteresis and Repeatability: +0.04
Best Straight Line (BSL) (option A)– Stability: 0.1% F.S./annum
System Accuracy STARLUCK
EPDMS Advantages
Between 1987 and 1993, 251 electronic systems were installed in the North Sea
15% failed shortly after installation30-40% failed within 2 years
Typical causes are attributed to downhole cable splices, connectors and electronic failures
STARLUCK
EPDMS Advantages• No Down hole Electronics
– All down hole components are free of electronic parts nothing to get damaged after installation
• Suitable for Harsh Environments– Temp > 800F– Corrosives well conditions– Vibration resistant
• Check System Integrity From Surface– Transducers and data recording devices can be checked from surface
without well intervention– Chamber integrity can be checked without system retrieval
• Flexible– System can be installed in many configurations– System can be installed with DTS options
STARLUCK
EPDMS Advantages• Accurate
– Quartz/Strain Pressure Gauge– Correction of helium gas column either in real time or
post processing• Rugged
– The parts can be installed, removed and reran into same or other wells– Long track record
• Easy to Install and Maintain– The system can be installed and maintained by non engineered personnel
• Wellhead Penetration Simplicity– Wellhead exits use standard fittings– Most wellhead companies already have designs for control line exits– Wellhead penetration is economic
STARLUCK
EPDMS Advantages
• Splices and Connections– Splices are done quick and easy with tube to tube unions– Connections are none electronic and only require ferrule
type fittings
• Economic Pricing– Systems typically run 50% to 75% of typical EDHG systems
STARLUCK
EPDMS Limitations
• Response time• Deep low pressure installations (Purging)• Chamber dimensions in some wellbores• Safety issues (BHP to surface)• Overcoming the low tech syndrome• Retrievable installation depth limitation
STARLUCK
Pressure Chambers
STARLUCK
Pressure Chambers• What is a Pressure Chamber
– The downhole chamber provides a volumetric area calculated to cover an expected pressure range to prevent well bore fluids from entering the capillary or small diameter tubing
VC=(PMAX´VT )PMIN
é
ë ê
ù
û ú VT
STARLUCK
Chamber Design• Chamber design is a function of the following:
– Installation Type (Retrievable, Extended, Permanent)– Wellbore completion design– Minimum and maximum wellbore pressure
(Required Chamber Volume)– Size of capillary tubing being installed– Pressure requirements for tubing or casing string– Completion tubing or casing connections– Metallurgy– Location of pressure reading (Internal or External)– Certifications
STARLUCK
Chamber Design• Installation Type
– Extended • Tubing Conveyed in which the tubing can be
retrieved.– Permanent
• Casing conveyed and cemented in place– Retrievable
• Ran like slickline, wireline
STARLUCK
Pressure Monitoring
Device
Pressure Monitoring
Device
Chamber Installation Examples STARLUCK
Extended Design STARLUCK
Capillary Tubing
External Sensing
Ports are on the outside pipe of the chamber
Extended Chamber Design External Sensing STARLUCK
Capillary Tubing
Extended Chamber Design Internal Sensing
Internal Sensing
Ports are on the inside tubing of the chamber
STARLUCK
Expandable Chamber System
STARLUCK
Retrievable Chamber Assembly
Capillary Tubing
Permanent Chamber Design Blow Out Darts
Blow Out Darts
After the well has been cemented, the darts are blow out and communication is established
Capillary Tubing
Extended Design With Rupture Disk
Rupture Disk
A rupture disk it installed so the chamber pressure is not communicated to the capillary tubing.
This is used when a large I.D tubing is installed with high pressure.
STARLUCK
Chamber Design• Wellbore completion design issues
– Required location of pressure point or points.• Sensing location:
On an extended installation, do you need to monitor pressure on the Inside of the chamber (Internal sensing) or the outside of the chamber (external sensing)
– Casing and or liner sizes vs. chamber size• Will my chamber fit
– Consider what tubes or cables need to pass by the chamber. – Can I wash and fish over the chamber– Do in need to install an expandable chamber
» Expandable chambers can only be ran where the well flow path does not have to go through the chamber.
STARLUCK
Chamber Design
• Minimum and Maximum Wellbore Pressures– This will determine the amount of chamber volume
that is required.• This is based on the lowest vs. the highest pressure that
the chamber will see.• The angle of the Chamber is also a factor in chamber
design. • We always want to have the largest chamber
that will fit into the wellbore.
STARLUCK
Required Chamber Volume For Standard Size CapillaryTube Length: 5,000 ft.
Pressure Range: 1,000 to 5,000 psi
.250” x .152” I.D.Requires 4,354 Cubic Inches
.125” x .069” I.D.Requires 896 Cubic Inches
.125” x .054” I.D.Requires 454 Cubic Inches
.094” x .030” I.D.Requires 169 Cubic Inches
13.6” DiameterX
30” High
Chamber Design Program
Application
Pressure Requirements for Chamber
• Pressure rating for chamber– This is based on customer requirements for
tubing or casing (Pipe Specifications)– External or Internal sensing will also be a
factor in chamber design. – Collapse and burst ratings must exceed
expected conditions
Internal Sensing Pressure Rating
15K
8K
•Reservoir Pressure 15 KPSI•Annulus Pressure at Chamber 8 KPSI• Fluid weight + pressure
•Delta P = 7 KPSI•Outside chamber pipe must be rated for Delta P pressure. •The chamber weld procedure and materials must also be rated for maximum Delta P
Connections for Chamber• Connections for the pressure chamber should be the same
as the production tubing or casing you are connection to. • In some cased we will have the customer supply the pipe to
build the chamber due to premium connection availability – Fox– MVAM– Etc
• Connection O.D factor with outside pipe– The O.D of the connection must be smaller then the I.D
of the outside pipe used for the chamber. For Mfg Purposes
STARLUCK
Tubing Connections for Chamber
• Capillary tubing connections– HIP fittings– Soldered in tubing for
slim chambers – NPT threads for
rupture disk applications
Metallurgy for Chamber
• Metallurgy should match tubing and or casing being installed into the well– Once again we may ask customer to supply the
pipe due to the availability of this material• Chamber subs may also need to be changed
based on welding procedures.
STARLUCK
Certifications for Chamber
• Depending on installation and customer, all materials may need to be tracked and all building procedures are documented
• Pressure testing documentation is required.
STARLUCK
Break 10 Minutes
STARLUCK
System Checks
STARLUCK
System Checks
• Chamber check– This check is intended to ensure that the
pressure point is inside of the chamber.
STARLUCK
System Check
0
50
100
150
200
250
0 50 100 150 200 250 300 350
Time (Hrs)
PSIA
First system Check
SecondSystem Check
Starting of pump
Rate Change on Pump
Pump is shut off1st indication of
problemSystem is purged
System Check Data STARLUCK
System Check Data
System Check
150155160165170175180185190195200205210215
315 315.1 315.2 315.3 315.4 315.5 315.6 315.7Time (Hrs)
PSIA
Wellbore Pressure
Chamber CheckAir Bleed
Stabilized Pressure
Disconnect to purge
Stabilization after purge
Return to proper
pressure
STARLUCK
System Check Data
System Check
3035404550556065707580859095
100
337.6 337.65 337.7 337.75 337.8 337.85 337.9 337.95 338Time (Hrs)
PSIA
Wellbore Pressure
Chamber Check 15 ft of Captubing
Stabilized PressureDisconnect to
purge
Stabilization after purge
Return to proper
pressure
STARLUCK
Surface Electronics Check
• Transducers can be checked in the lab or sent back to MFG
• Additional transducer can be installed to check accuracy
• Same applies to Data Loggers
STARLUCK
Installation Options
STARLUCK
EPDMS has been installed in almost every type of well
• Oil Wells• Gas Wells• Pumping Wells• Gas Storage
Wells
• Steamflood Wells
• Geothermal Wells
• Waste Disposal Wells
• EPDMS is usually installed as a permanent completion but can also be suspended for temporary application
STARLUCK
Installation Options
• Extended (Tubing Retrievable)– These installations are installed when long term
pressure monitoring is required but the customer wants the ability to retrieve the system if needed
– This option is also required when down the tubing type well intervention is needed such as running logs or doing wireline work.
– If the well has already exist, it is not possible to do a permanent installations (cemented in place)
STARLUCK
Extended Pressure SystemAbove Packer
Pressure Chamber4615 m
Inside Sensing3.5” X 5”
30"
20"
13 3/8"
9 5/8"
B.L. 5"
7"
198 m
825 m
1894 m
4175 m
4632 m
4837 m
PT.5231 m
PI. 5200 m
5" 5230 m
BL 7"3952.6 m
Tp 3 1/2"
4340 - 4355 m KS
5100 - 5120 m JSK
Cople de cemento multiple 1886 m
4475 - 4515 m KM
Emp. 7“ Backer 4625 m
Empacador S-6 4635.5 m
Combinación 7"x7 5/8” 1999.5 m
20 ¾” x 13 5/8”x 11”x 7 1/16”(15M) x 3 1/2” (10M)
VT +/- 150 m
Tp 31/2"
INTERVALOS OBTURADOS
5055 - 5080 mINTERVALO AMPLIADO
PressureTubing 125” O.D
Extended Pressure SystemBelow Packer
20"
13 3/8"
9 5/8"
7"
5"
5234.7 m
5336 m
5602 m
B.L.5"
P.I. 5502 m
5090 - 5115 m.
5050 – 5075 m
JSK
INTERVALOS OBTURADOS
BL 7" 4550 m
P.T. 5603 m
5482 –5500 m
EMPACADOR 7” 5200 m
30" 198 m
999 m
3363 m
Tp 4 1/2"
VT +/- 150 m
20 ¾”x13 5/8”x11”x7 1/16”x 3 ½” EPN NUEVOTp 3 1/2"
Pressure Chamber 5500 m
Capillary Tubing.125” O.D
5475 –5482 m
5"
P.T. 5603 m
5602 m
P.I. 5502 m
External Sensing Pressure Chamber
.125” Pressure Tubing on O.D of 2.375” Tubing
Bottom View of the Wellbore
EMPACADOR 7”
5475 –5482 m
Installation Options
• Retrievable (Wireline type installations)– These installations are mostly installed when the data
is desired for short term durations.– Surveys
• Dip-ins• Build-ups• Draw downs
– Can also be installed for long term testing
STARLUCK
Retrievable Installation
1345 HRS83.73 KG/CM
1445 HRS83.90 KG/CM
STARLUCK
Installation Options
• Permanent (Cemented in place)– These installations are installed in new or re-
completed wells– Installations are cemented in place and use blow out
dart chamber.– Installations are non intrusive in future well work.– Only a few installations have been performed.
STARLUCK
Extra Heavy Duty Tubing Protectors
.125” Tubing
Pressure Chamber with Blow Out Darts5 ½” X 7”
Permanent Pressure Installation
Capillary Tubing Pressure SystemRisk Assessment
Capillary Tubing Pressure SystemRisk Assessment
• Possible Failure - Crushed or Ripped Capillary tubing on trip in hole.– Probability of Occurrence - < 1% of trips in
hole.– Worst Case Scenario – Problem identified on
trip in hole by purging, chamber check and continuous pressure monitoring methods.
• Solution - Well equipment is pulled back out of hole until bad spot is found. Decision is made to pull equipment entirely or perform a high pressure splice of capillary tubing allowing continued running of well equipment.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
• Possible Failure - Hole develops in Capillary tubing or volume chamber due to corrosion.– Probability of Occurrence - Less likely than
hole in tubing. – Worst Case Scenario – Gas well, over-
pressured producing zone, leak near top of well.
• Result – Annulus fills with gas to the depth of the leak. Pressure at casing head equals FBHP @ chamber minus the gas column hydrostatic. Annulus pressure above packer equals casing head pressure plus fluid and gas column weight.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
– Example:• 15,000 ft well, 10,000 psi reservoir pressure.• Res. Temp = 325 oF, Avg. Flowing Temp = 250 oF• FBHP = 8000 psi, FWHP = 1500 psi.• Volume chamber @ 14,500’• Leak @ 100 ft.
– Calculations (based on methane):• Wellhead annulus pressure
– Flowing ~ 6700 psi (differential ~5200 psi).– Shut-in ~ 8500 psi (differential ~ 0 psi).
• Annulus pressure just below Volume chamber – Flowing ~ 13,000 psi (differential ~ 5000 psi).– Shut-in ~ 14, 700 psi (differential ~ 4700 psi).
• Possible Failure - Hole develops in Capillary tubing or volume chamber due to corrosion.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
• Risk Mitigation– Tubing and casing designs should
handle added pressure differentials.– Wellhead annulus bleed-off designs
should be in place.
• Possible Failure - Hole develops in Capillary tubing or volume chamber due to corrosion.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
• Possible Failure - Well destroyed at sea-floor due to surface disaster.– Probability of Occurrence - Very unlikely but possible.– Worst Case Scenario – Capillary tubing is parted at
sea-floor with a reduced diameter opening allowing reservoir fluids to flow to sea-floor.
• Oil Reservoirs –Friction loss of liquid flow and probability of plugging limit liquid volume reaching sea-floor.
• Gas Reservoirs – Production rates of gas are limited by sonic velocity of gas and extremely small capacity of Capillary tubing. Gas pressure is limiting factor of flow rate.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
• Example:– 15,000 ft well, 10,000 psi reservoir pressure.– Res. Temp = 325 oF, Avg. Flowing Temp = 300 oF– Volume chamber @ 14,500’– Water Depth 500 ft.– No loss in diameter of Capillary tubing.
• Oil Reservoir– Flow rate ~ 0.06 gal/min
• Delta Pressure ~ 9800 psi• Based on flow equations.
• Gas Reservoir– Flow rate (max.) ~ 350 scf/min– Based on:
• Sonic Velocity ~ 1765 ft/sec (methane)• Volume of 1765 ft of 1/8”, 0.054” ID Capillary tubing ~ 0.21 gals• Avg pressure (last 1765 ft) ~ 5000 psi.
• Possible Failure - Well destroyed at sea-floor due to surface problems.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
• Risk Mitigation– Not necessary for liquid production due to
extremely low worst case liquid flow rates.– If potential gas flow rates exceed regulation
for re-entry of well, install Capillary tubing sub-surface safety valve to prevent flow if disaster occurs.
• Possible Failure - Well destroyed at sea-floor due to surface problems.
STARLUCK
Capillary Tubing Pressure SystemRisk Assessment
• Possible Failure – Pressure Capillary tubing is broken on surface.– Probability of Occurrence - More likely than any
other failure, but still extremely low probability.– Worst Case Scenario – Capillary tubing breaks
due to equipment falling on it. Gas well with very high reservoir pressure. Gas has high H2S content.
– Risk Mitigation• Same procedures that exist for flow line damage.
– Block valve installed on Pressure Capillary tubing where it exists the wellhead.
– Monitoring equipment w/ alarms should be located around wellheads.
– Safety procedures in place to allow shutting of valve under H2S gas conditions.
STARLUCK
Data Collection
Data Collection
• Data loggers– Halliburton Data Logger– New Data logger Development– Additional devices can also be monitored
with this device• Pressure• Flow• Temp T/C• Delta meters
STARLUCK
Data Monitoring Equipment
Data Collection
• Power consumption– Current data loggers are low power and only
require a 12 V power supply and solar chargers.
– AC to DC converters are also used.
STARLUCK
Data Collection
• SCADA– Transducers can be converted to interface
with customers SCADA systems• 4-20 mA• 0-5 Volts• Other
STARLUCK
Data Collection
• Tie-in to pump controllers– Transducers can be tied in to POC and
the pump can be regulated by BHP
STARLUCK
EndTerimakasih
By Dody Junized02-01-2010
EPDMSEXACT DOWNHOLE
PRESSURE MONITORING SYSTEMREVIEW