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Continuous Flow (IPO) Valves
Dual Gas Lift Continuous Flow (IPO) Valves Offshore West Africa Well X-1 (long) and X-1D (short)
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RCF Series - IPO Valves for Continuous Flow
Special IPO gas lift valves for continuous flow (R-1CF & RCF-2) used in redesign of well, X-1 RCF series valves are simply IPO valves with gas chokes positioned upstream of valve port or seat Valve configuration maintains tubing sensitivity after valve is in open position
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Formation Tops W/ Pay Orig. KB TH 59’ Curr. KBTH 59’
Orig. KB Elev. 91’ (Above Sea Level) Jkt TVDSS 6422 ’ TD WLM Zero MD Directional Well Max Angle ft LONG STRING – 2-7/8” MD TVD SS SCSSV ’ ’ N-Nip ’ ’ GLM # ’ ’ GLM # ’ ’ GLM # ’ ’ GLM # ’ ’ GLM # ’ ’ GLM # ’ ’ GLM # ‘ ’ GLM # ’ ’ GLM # ’ ’ GLM # ’ ’ GLM # ’ ’ 2 7/8” X-LN ’ ’ 9 5/8” U-Pkr Ext 5588’ ’ 9 5/8” 51.B Pkr ’ ’ 9 5/8” L-Pkr Ext 5596’ ’ Blast Jts ’ ’ 2 7/8” X-LN ’ ’ 9 5/8” FHL Pkr ’ ’ 2 7/8” X-LNp ’ ’ Perf Pup Jt ’ ’ 2 7/8” XN-LNp ’ ’ EOT ’ ’ 2 7/8” 6.50 #, L-80 CSH Tubing SHORT STRING – 3-1/2” MD TVDss SCSSV 496’ 404’ X-LNp 1001’ 902’ GLM # ’ 1282’ GLM # ’ 1892’ GLM # ’ 2357’ GLM # ’ 2707’ GLM # ’ 3056’ GLM # ’ 3407’ GLM # ’ 3700’ GLM # ’ 3993’ GLM # ’ 4316’ GLM # ’ 4609’ GLM # ’ 4902’ 3 1/2” X-LNp 5580’ 5141’ 9 5/8” U-Pkr Ext 5591’ 5152’ 9 5/8” 51.B Pkr 5591’ 5152’ 9 5/8” L-Pkr Ext 5597’ 5157’ 3 1/2” X-LNp 5612’ 5171’ Perf Pup Jt 5613’ 5172’ 3 1/2” XN-LNp 5619’ 5177’ EOT 5629’ 5187’ Formation Tops W/ Pay MD TVDss 4523’ ’ 4740’ ’ 4946’ ’ 5595’ ’ 5640’ ’ 6188’ ’ 6659’ ’ 6830’ ’
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Well X1 (Dual) History Well completed as common annulus dual; G/L mandrels contained dummy valves; both wells came in flowing naturally Waterflood injection initiated into reservoirs Due to increasing water cut and declining production, R-2 IPO valves were installed in 3.5” short string; valves were designed for 800 psi KO, 750 psi OP Due to increasing water cut and declining production, R-1CF IPO valves were installed in 2-7/8” long string; valves were designed for 750 psi OP July 1996 June 1998 Sept. 1998 Mar. 2000
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X-1D (short) Sept 1998 – R-2 IPO gas lift valves installed for unloading and gas lift operation, if required PI = 3.35 B/D/psi BHT = 165 deg F Design Rate = 2000 B/D %WC = 80% GL Pressure = 800 psi Recorded SBHP = 1600 psi (26 Sept 98)
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Well X-1 (Dual) History High lift gas usage to both strings and production decline from short string prompted re-design of both strings; higher available gas lift pressure supply of 1150 psi allowed both strings to be designed for PSO pressure of 1050 psi R-1CF and R-2CF continuous flow valves were installed by slick-line Tests showed lift gas reduction in both strings, with oil increase of 560 barrels from short string Jan. 2002 Feb. 2002
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X-1 (Long) After GLV redesign and installation, well producing 1,750 bfpd with Qi = 500 mcfpd and lifting from GLV depth (4104 ft TVD)
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X-1D (short) Jan 2002 – redesign with RCF-2 valves for 1050 psi Operating Pressure BFPD = 2500 [+1000 bfpd] Qi = 750 Mcfpd [-500 Mcfpd] Injection Depth = 4993’ TVD
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Well Test Data X-1
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Well Test Data – X-1D
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X-1 GLV Installation
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X-1D GLV Installation
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X-1 Results R-1CF & RCF-2 gas lift valves allow GL designer to maintain higher injection pressure, thus deeper injection depth Different Injection Depths for each tubing string ’ TVD for X-1 and 4993’ TVD for X-1D X-1 - increase in fluid rate by 10% X-1D - increase in fluid rate by 65% Combined (Qi) gas injection rate was reduced by 25% Combined oil gain was 560 bopd
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Continuous Flow (IPO) Valves
Dual Gas Lift Continuous Flow (IPO) Valves ?? QUESTIONS ??
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