Horse Casing Slipstream

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Horse Casing Slipstream

  1. 1. Casing Slipstreamers – From Idea to Reality <ul><li>Leland Horse Area – Deep Basin </li></ul><ul><li>Rob McPike C.E.T. </li></ul>
  2. 2. Area of Interest: Canadian Map NYSE: DVN www.devonenergy.com page B.C. SASK. Pacific Ocean Deep Basin South Area of Interest ALBERTA Karr Placid Wild Resthaven Horse Olsen/Pinto 41 Prod Wells Average 60% WI Net Sales of 27 mmscfd
  3. 3. Remote Operations Area – Limited Access to Well Sites NYSE: DVN www.devonenergy.com page
  4. 4. Deep Basin South: Multi-zone Potential NYSE: DVN www.devonenergy.com page <ul><li>Thrusted Cardium : middle to upper shoreface sands. Productive formation in Smokey </li></ul><ul><li>Dunvegan : middle shoreface sands of prograding delta. Regionally mappable and seismically definable and local production </li></ul><ul><li>Cadotte : upper shoreface sands. Regional defined </li></ul><ul><li>Falher : channel deposits to shoreface sands Falher F and Falher E locally and regionally defined, seismically mappable (Falher F) </li></ul><ul><li>Bluesky : Delta sands marks regional transgression </li></ul><ul><li>Gething : Upper and Lower fluvial channels regionally mappable and locally productive. </li></ul><ul><li>Cadomin : Alluvial plain to braided channel deposits with fracture enhancement. Regionally mappable near offset gas test. </li></ul>885 m 5-22-58-2w6 CRDZ 8-16-58-2w6 Thrusted CRDM sand Dunvegan Bsl Dunvegan Cadotte lower FLHR CDMN
  5. 5. 102/7-2-59-25W5M Well Summary Sheet NYSE: DVN www.devonenergy.com page Tubing – 2 3/8 ” Casing - 5 ½”
  6. 6. Area History <ul><li>Original Leland Horse wells (100% WI) originally started out at production rates of up to 450 e3m3/d producing both the tubing and casing in a competitive drainage reservoir </li></ul><ul><li>Once critical lift was reached flowing the casings they were shut in and only tubings were produced with a noticeable production loss (30 e3m3/d) due to tubing friction </li></ul>NYSE: DVN www.devonenergy.com page
  7. 7. Critical Rate Graph for 60.3 mm TBG & 139.7mm CSG producing @ 3000 kPa NYSE: DVN www.devonenergy.com page Casing critical rate 100e3m3/d Tubing critical rate 24 e3m3/d
  8. 8. 102/7-2-59-26W5M IPR / Tubing Performance Curve NYSE: DVN www.devonenergy.com page
  9. 9. How can we mitigate the production loss? <ul><li>PROBLEM </li></ul><ul><li>Reduced flow up tubing due to friction </li></ul><ul><li>Maintaining critical rate up tubing flow path to lift liquids </li></ul><ul><li>SOLUTIONS </li></ul><ul><li>Do nothing and accept the reduced production – not an option as this is a competitive drainage reservoir </li></ul><ul><li>Investigate methods of producing the casing without liquids loading the well bore </li></ul><ul><li>What is casing slipstreaming? </li></ul>NYSE: DVN www.devonenergy.com page
  10. 10. Theory of Casing Slipstreaming <ul><li>Produce the maximum amount of gas the well can deliver without entering a liquids loaded condition </li></ul><ul><li>Intermittently produce the casing to allow “extra” production that is “trapped”, due to friction losses in the tubing, to flow up the casing while constantly maintaining critical rate up the tubing string to not enter a liquids loaded condition </li></ul>NYSE: DVN www.devonenergy.com page
  11. 11. Simplified Flow Schematic NYSE: DVN www.devonenergy.com page
  12. 12. 102/7-2-59-26W5M Gas Production NYSE: DVN www.devonenergy.com page
  13. 13. Incremental Volume
  14. 14. Attempted to find solutions to this production loss <ul><li>First attempt was to tie in casing with 1” piping and control flow with a globe valve </li></ul><ul><li>This failed due to liquids loading of the tubing because there was no monitoring of the critical rate </li></ul><ul><li>This experience determined that the tubing flow needed to be monitored to maintain critical rate up the tubing and that the flow from the casing needed to be controlled with some degree of automation due to remote locations </li></ul>NYSE: DVN www.devonenergy.com page
  15. 15. Developing A Solution <ul><li>Current casing spool to be modified to incorporate all of the required equipment. </li></ul><ul><li>AGA quality flow measurement for the casing not required as it was only a reference flow </li></ul><ul><li>Wet fuel gas instrument lines have been an issue in the past - led to investigating an electric actuated controller </li></ul>NYSE: DVN www.devonenergy.com page
  16. 16. Control Philosophy <ul><li>Use simple cost effective meter run to measure casing flow </li></ul><ul><li>Continually monitor tubing flow to insure it is above critical rate – no access for swabbing equipment 8 months a year </li></ul><ul><li>Utilize SCADA control and all automation available due to remote locations </li></ul>NYSE: DVN www.devonenergy.com page
  17. 17. Simplified Casing Slipstreamer P&ID NYSE: DVN www.devonenergy.com page
  18. 18. 102/7-2-59-25W5M prior to piping modifications NYSE: DVN www.devonenergy.com page
  19. 19. Overview of the 102/7-2-59-26W5M site. NYSE: DVN www.devonenergy.com page RTU and Solar Panels Separator Package Line heater Thermoelectric Generator (use propane for added reliability) Casing Slipstreamer assembly
  20. 20. 102/7-2-59-25W5M after required piping modifications NYSE: DVN www.devonenergy.com page Orifice flanges -simple meter run Baker choke with Electronic actuator Bristol Flow Computer
  21. 21. SCADA Wellsite Overview Page NYSE: DVN www.devonenergy.com page Casing Flow Tubing + Casing Flow
  22. 22. SCADA Casing Flow Controller Screen NYSE: DVN www.devonenergy.com page Calculated TBG Critical Rate Control Setpoint
  23. 23. Casing Slipstreamer Approximate Costs NYSE: DVN www.devonenergy.com page <ul><li>$ 2800 actuator assembly </li></ul><ul><li>$2000 orifice plate and required flanges </li></ul><ul><li>$4000 choke assembly </li></ul><ul><li>Upgraded the Bristol 3305 RTU to a Control Wave Micro (most expensive cost @ $18,000) </li></ul><ul><li>Piping modifications $8000 </li></ul><ul><li>Total estimated costs = $40,000 </li></ul>
  24. 24. Valuation <ul><li>Current net back- $3.60/mcf </li></ul><ul><li>25 3eme/d of “extra” production = $3180/day </li></ul><ul><li>Potential added “extra” revenue of 1,160,777 over the course of a year. </li></ul><ul><li>Cost of installation approximately $40,000 . </li></ul><ul><li>PROJECT PAYOUT OF LESS THAN </li></ul><ul><li>13 DAYS </li></ul>NYSE: DVN www.devonenergy.com page
  25. 25. TODAY AT LELAND HORSE <ul><li>Currently there are 17 wells equipped with casing slipstreamers in the Horse Field </li></ul><ul><li>The added incremental production has been between 5 e3m3/d and 25 e3m3/d </li></ul><ul><li>Now standard on all new Horse wells – facilities installation </li></ul><ul><li>Have recently installed in Resthaven area with similar success </li></ul>NYSE: DVN www.devonenergy.com page
  26. 26. Conclusions and Learning's <ul><li>There are production gains to be had – TIMING IS CRITICAL TO TAKE ADVANTAGE OF ANY PRODUCTION GAINS. Equipment needs to be in place before critical rate becomes a factor to maximize return </li></ul><ul><li>CANDIDATE SELECTION </li></ul><ul><li>- Tubing / Casing differential pressures </li></ul><ul><li>– IPR curves </li></ul><ul><li>- Tubing performance curves </li></ul>NYSE: DVN www.devonenergy.com page
  27. 27. Conclusions and Learning's <ul><li>Sites must be as automated as possible due to remoteness of location </li></ul><ul><li>The electric actuator has been a huge success – investigating other possible applications </li></ul><ul><li>Proven method of increasing production </li></ul>NYSE: DVN www.devonenergy.com page
  28. 28. QUESTIONS? NYSE: DVN www.devonenergy.com page
  29. 29. THANK YOU NYSE: DVN www.devonenergy.com page Special thanks to Dave Stokes who was a huge believer and proponent of this project

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