Bridging the Gap Using Gas Assisted Plunger Li5 (GAPL) Presented By: Todd Thrash Technical Data Provided By: Rusty Brown, P.E.
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1 Bridging the Gap Using Gas Assisted Plunger Li5 (GAPL) Presented By: Todd Thrash Technical Data Provided By: Rusty Brown, P.E.
2 Overview What is GAPL? Advantages of GAPL Produc7on Analysis A technical review suppor=ng the implementa=on of GAPL on a well- by- well basis Model flowing gradients Es=mate sta=c and flowing bogom hole pressures Calculate the wells Produc=vity Index Es=mate increase in produc=on Case Studies Increased Produc7on Lowered Injec7on Rates Improving Paraffin Control While Reducing Associated Costs
3 What is GAPL? GAPL, or Gas Assisted Plunger LiD, is a hybrid lid method using both gas li5 and plunger li5 to ar7ficially produce gas and/or oil wells. Gas Li5 Compressor / High Pressure Gas Supply Gas LiD Valves With or Without a Packer Design in place that allows for the deepest possible point of injec7on Plunger Li5 Lubricator Control Box Arrival Sensor Plunger Down- Hole Bumper Spring Design Considera;on: For GAPL design, the down- hole bumper spring should be set so that it s 1 joint above the system s opera7ng valve, or point of injec7on. This will allow for more fluid recovery and drawdown. PLUNGER ARRIVAL SENSOR MANUAL/AUTO CATCH ADJUSTABLE INJECTION CHOKE GAS LIFT VALVE LUBRICATOR HAMMERHEAD CONTROLLER MOTOR VALVE FREE CYCLE PLUNGER BUMPER SPRING TUBING STOP
4 Advantages Bridging the Gap Cost effec7ve method that bridges the gap between gas lid and plunger lid systems, ul7mately prolonging the requirement for more costly ar7ficial lid methods. As BHP s decline in exis7ng gas lid applica7ons, the produc7on also declines. This usually means less efficient liding as gas breaks through the fluid allowing fluid to fall back on the forma7on. The plunger prevents fluid from falling back and allows for further drawdown, maximizing produc7on. A more efficient seal created by the plunger, means less injec7on gas required to lid the same volume of fluid. In some cases, the injected gas can be tapered off, allowing the well to transi7on into plunger lid alone. Effec7ve method on paraffin and scale control, significantly reducing associated costs.
5 Produc>on Analysis Gathering Produc>on Data Produc7on data is gathered, and outliers such as compressor down- 7me or high line pressure are omi^ed GLR s are calculated for both above and below the point of injec7on
6 Produc>on Analysis Modeling Flowing Gradients and FBHP Producing GLR s are used to model mul7- phase flowing gradients and FBHP s FBHP s will be used in helping to determine the well s current IPR Sta7c and Flowing BHP Tests can be used in place of well modeling Mul7- Phase Flowing Gradient Modeled FBHP
7 Produc>on Analysis IPR Curve The FBHP for each flowing gradient is plo^ed against the actual total liquid rate A linear trend- line is drawn to es7mate SBHP The inverse of the slope is used to es7mate PI
8 Produc>on Analysis Region of Slug Flow Turner- Coleman s Cri7cal Rate is plo^ed against the total actual gas rate Liquid loading occurs when the actual gas rate drops below cri7cal, defined as Region of Slug Flow Implemen7ng GAPL would reduce the amount of injec7on gas required to meet the cri7cal rate requirement, reducing the Region of Slug Flow X
9 Produc>on Analysis An>cipated UpliK Calcula7ng how much of an increase in produc7on will take place is hard to accomplish with a plunger in the well 40-50% decrease in FBHP is not uncommon A percentage decrease in FBHP can be used to es7mate the increase in fluid produc7on Decrease in FBHP X Produc7vity Index = Total Fluid UpliD 112 PSI x BPD/PSI = 27.4 bbl Total Fluid UpliD 27.4 bbl Total Fluid UpliD x 0.27 OC = 7.3 bbl Oil UpliD Assuming a constant GLR and taking into account the total fluid uplid, the increase in gas produc7on can be es7mated Form. GLR X Total Fluid UpliD = Gas UpliD 6996 scf/bbl x 27.4 bbl Total Fluid UpliD = 191,690 scf Gas UpliD Table Well #1 Anticipated Uplift Decreased FBHP Decreased FBHP Oil Uplift Gas Uplift psi bpd mscfd 10% % % % % % % % %
10 Case Study Gas LiK Converted to GAPL, to Plunger LiK Operator Confiden7al Well Name Confiden7al Region Permian Basin Forma7on Wolfcamp B Packer Depth 8240 MD / 8120 TVD Tubing Size 2-3/8 Primary goal was reduce inj. gas and keep the tubing clean 2-7/8 GL HIT 2-3/8 GAPL Free Cycle Plunger LiD Significant increase in gas produc7on allowed for tapering of the injec7on gas un7l the plunger could run on its own ROI was less than 1 week
11 Case Study GAPL for Paraffin Control Operator Name Confiden7al Well Name Confiden7al Region Permian Basin Forma7on Wolfcamp Packer Depth 9250 MD Tubing Size 2-7/8 Primary goal was to control paraffin and reduce associated costs Not only did GAPL lower the well s LOE, it doubled both gas and oil produc7on Operator has installed addi7onal systems with similar results Natural Flow Gas LiD GAPL
12 Questions? CONTACT INFORMATION TODD THRASH, PRIORITY ARTIFICIAL LIFT (817)
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