Gas Lift Redesign in Dual Strings CompletionWahyu Jatmiko ( BP-Indonesia )Herry Subekti ( BP-Indonesia )Gatut Widianoko ( Weatherford )
Presented by Henry Nickens, BP-America, Houston
* of 24
Gas Lift Redesign :To change setting pressure and port size of gas lift valves, unloading and operating valves, at existing mandrels.
* of 24
BP West Java Well WorkSand Clean OutMatrix StimPerforationGas LiftChoke OptWSOScale Clean OutZone Change
Chart5
000000000000
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0.000520.0003211435.485142.176389.831398.2617.43966.41233
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0.000720.0005211562.304339.35479.838.84993
0.000820.0006211672.525480.333544.90711.24893
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Choke Optimization : 0 $/bbl - 15 Jobs
Fishing : $89k spent; zero benefits
Gas Lift : 0.055 $/bbl - 66 Jobs
Matrix Stimulation : 1.4 $/bbl - 10 Jobs
Other : 0.074 $/bbl - 5 Jobs
Perforation : 1.447 $/bbl - 23 Jobs
Sand Clean Out : 3.284 $/bbl - 17 Jobs
Sand Control : 176.367 $/bbl - 5 Jobs
Scale Clean Out : 2.668 $/bbl - 7 Jobs
SSSV : 0.017 $/bbl - 8 Jobs
Water Shut Off : 1.349 $/bbl - 3 Jobs
Zone Change : 0.505 $/bbl - 26 Jobs
Cuml Volume (MBBL boe) Oil + boeGas( Job Date Range = Date Range between 01 Jan 2003 and 31 Jul 2003 in Success sequence )
Cuml Cost (k$)
One Year Scorpion plot : Indonesia - WJ : All Assets : Gross : Opex : WellWork: Normal
Scorpion 03 ttl
1890.711 $/bbl
00
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&A
Page &P
Scorpion 03 ttl
0.711 $/bbl
Cuml Volume (MBBL boe) Oil + boeGas( Job Date Range = Date Range between 01 Jan 2003 and 31 Jul 2003 in Success sequence )
Cuml Cost (k$)
One Year Scorpion plot : Indonesia - WJ : All Assets : Gross : Opex : WellWork: Normal
Scorpion 03 Sol
15Choke Optimization : 0 $/bbl - 15 Jobs4Fishing : $89k spent; zero benefits66Gas Lift : 0.055 $/bbl - 66 Jobs10Matrix Stimulation : 1.4 $/bbl - 10 Jobs5Other : 0.074 $/bbl - 5 Jobs23Perforation : 1.447 $/bbl - 23 Jobs17Sand Clean Out : 3.284 $/bbl - 17 Jobs5Sand Control : 176.367 $/bbl - 5 Jobs7Scale Clean Out : 2.668 $/bbl - 7 Jobs8SSSV : 0.017 $/bbl - 8 Jobs3Water Shut Off : 1.349 $/bbl - 3 Jobs26Zone Change : 0.505 $/bbl - 26 Jobs
000000000000000000000000
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&A
Page &P
Scorpion 03 Sol
Choke Optimization : 0 $/bbl - 15 Jobs
Fishing : $89k spent; zero benefits
Gas Lift : 0.055 $/bbl - 66 Jobs
Matrix Stimulation : 1.4 $/bbl - 10 Jobs
Other : 0.074 $/bbl - 5 Jobs
Perforation : 1.447 $/bbl - 23 Jobs
Sand Clean Out : 3.284 $/bbl - 17 Jobs
Sand Control : 176.367 $/bbl - 5 Jobs
Scale Clean Out : 2.668 $/bbl - 7 Jobs
SSSV : 0.017 $/bbl - 8 Jobs
Water Shut Off : 1.349 $/bbl - 3 Jobs
Zone Change : 0.505 $/bbl - 26 Jobs
Cuml Volume (MBBL boe) Oil + boeGas( Job Date Range = Date Range between 01 Jan 2003 and 31 Jul 2003 in Success sequence )
Cuml Cost (k$)
One Year Scorpion plot : Indonesia - WJ : All Assets : Gross : Opex : WellWork: Normal
Scorpion 02 ttl
2311.042 $/bbl
00
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&A
Page &P
Scorpion 02 ttl
1.042 $/bbl
Cuml Volume (MBBL boe) Oil + boeGas( Job Date Range = Year 2002 in Success sequence )
Cuml Cost (k$)
One Year Scorpion plot : Indonesia - WJ : All Assets : Gross : Opex : WellWork: Normal
Scorpion 02 Sol
7Choke Optimization : 0 $/bbl - 7 Jobs8Fishing : 0.216 $/bbl - 8 Jobs93Gas Lift : 0.094 $/bbl - 93 Jobs26Matrix Stimulation : 0.745 $/bbl - 26 Jobs2N2 Kick Off : $122k spent; zero benefits13Other : 0.109 $/bbl - 13 Jobs12Perforation : 0.786 $/bbl - 12 Jobs5Rig W/O : 17.521 $/bbl - 5 Jobs8SSSV : 0.074 $/bbl - 8 Jobs20Tubing Clean Out : 3.193 $/bbl - 20 Jobs37Zone Change : 0.282 $/bbl - 37 Jobs
0000000000000000000000
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&A
Page &P
Scorpion 02 Sol
Choke Optimization : 0 $/bbl - 7 Jobs
Fishing : 0.216 $/bbl - 8 Jobs
Gas Lift : 0.094 $/bbl - 93 Jobs
Matrix Stimulation : 0.745 $/bbl - 26 Jobs
N2 Kick Off : $122k spent; zero benefits
Other : 0.109 $/bbl - 13 Jobs
Perforation : 0.786 $/bbl - 12 Jobs
Rig W/O : 17.521 $/bbl - 5 Jobs
SSSV : 0.074 $/bbl - 8 Jobs
Tubing Clean Out : 3.193 $/bbl - 20 Jobs
Zone Change : 0.282 $/bbl - 37 Jobs
Cuml Volume (MBBL boe) Oil + boeGas( Job Date Range = Year 2002 in Success sequence )
Cuml Cost (k$)
One Year Scorpion plot : Indonesia - WJ : All Assets : Gross : Opex : WellWork: Normal
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West Java Field OverviewWest Java Reservoir OverviewWest Java Dual CompletionWhy redesign gas lift Process flow to redesign gas lift valves Summary
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West Java Overview
BP-West Java area is located offshore of the north of Java Island in Indonesia. Initial oil production was in 1971. West Java field covers an area of some 18,000 square-kilometers with total wells around 700. 75% of total wells are producing under gas lift system. Current production rate of 40,000 BOPD and 300 MMscfd of gas (~ 75 bopd/600 Mscfd per well)
JAKARTA
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ARDJUNA
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BZZ
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EQ-EZ
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F
FF
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KLX
KLY
KNA
KL
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APN
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LES/KKN
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CIREBON
bp Indonesia
West Java
L/LL Location
West Java Business Unit
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West Java Reservoir OverviewWest Java reservoir is multi stacked sandstone and carbonate reservoir.Mostly oil was producing from main, massive, baturaja and talang akar formation. The rest of formation are gas producing.Liquid productivity index is 1-5 bbl/day/psia, average TGOR of 500-1000 scf/stb and current liquid production about 500-1000 BLPD.No reservoir pressure maintenance
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West Java Dual Completionoptimise oil productionavoid cross flowbe able to allocate production dataperform well workdo reservoir monitoring Dual completion was selected to :
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Why redesign gas lift valves Periodically gas lift valve design is needed to : maintain liquid production due to declining reservoir pressure.response to the change of gas lift source pressure.increase gas injection rate due to increasing water cut.solve gas lift robbing problemLiquid production keep decliningGLV redesign was done
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Process flow to redesign Survey current gas lift performanceObtain field and reservoir dataMatching well test to estimate- gas oil ratio - productivity indexRedesign for best point of injection, setting valve pressure Optimize injection rate on short and long string
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Process flow to redesign Survey current gas lift performance
Gas lift gradient survey should be done prior to redesign gas lift to make sure there is no leaking in the tubing and to check gas lift performance.Dummy valves are leaking(~ 20% of wells)
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Process flow to redesign Field and Reservoir Data
To redesign gas lift, the following data is required :
Current reservoir pressure data Flowing gradient survey Well test data Latest gas lift valves report Setting pressure report Productivity Index Latest gas oil ratio
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Process flow to redesign Matching well test
Stable well test is selected for well test matching.For the dual completion, well test data does not give gas lift injection rate data.
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Process flow to redesign Matching well test
To estimate productivity index, well modeling is built using nodal analysis with the input :
total liquidwater cutflowing tubing pressure total GLR reservoir pressure
Injection rate estimated from
Qgas,inj = Qgas,total GORform x Qoil
Sensitivity on productivity index is performed to match liquid rate with well test.
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Process flow to redesign Matching well testProductivity index from well test matching is used to estimate gas oil ratio.
If GORform not available, then sensitivity on GLR until no intersection between IPR and tubing hydraulic was reached.
Then, current gas oil ratio could be calculated based on the result of the GLR sensitivity.
Gas liquid ratio with no intersection,GOR = GLR*Liquid/oil
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Process flow to redesign Design best point injection and setting pressure
Once productivity index and gas oil ratio could be estimated, the gas lift curve is generated to determine optimum gas injection rate.
Optimum injection rateShortLong
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Process flow to redesign Design best point injection and setting pressure
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Process flow to redesign Design best point injection and setting pressure
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Process flow to redesign Dual strings gas lift injection rate optimisation
Spreadsheet to check valve performance after new design is installed.
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Process flow to redesign Case I (operating valve depth and flowing tubing pressure are similar )
Gas robbing potentially occur To avoid gas robbing use similar port size
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Process flow to redesign Case II (operating valve depth and flowing tubing pressure are not similar )
Gas robbing potentially occurUse different port size to avoid gas robbing
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Process flow to redesign Example
Redesign Result
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Process flow to redesign Example
Well Test after and before gas lift redesignTarget: 6 redesigns/monthProduction~ 80 bopd increase Injection Gas~ 200 mscf/d decrease
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Summary Uncertainty on gas lift injection rate each string, current gas oil ratio and productivity index in dual strings completion could be estimated using nodal analysis.It is difficult to reach optimum gas lift injection rate in both string as gas injection rate in both string should be balance.Gas lift robbing is the main problem in dual completion but it could be avoided by:using similar port size in both string when flowing tubing pressure and operating injection point depth are similar.using different port size between short and long strings when flowing tubing pressure is different.Ideally, gas lift gradient survey is performed regularly to prevent gas lift robbing.
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Contact for further information:
Wahyu [email protected]
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