Double String Pumping Systems *Patent Pending Dennis R. Wilson, Advisor, Artificial Lift Engineering ConocoPhillips, Lower 48, San Juan Business Unit

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1 6 th Annual Sucker Rod Pumping Workshop Wyndham Hotel, Dallas, Texas September 14 17, 2010 Double String Pumping Systems *Patent Pending Dennis R. Wilson, Advisor, Artificial Lift Engineering ConocoPhillips, Lower 48, San Juan Business Unit

2 Double String Pumping System Simple Hollow rod pump adapted to a larger wellbore with solids problems Uses existing rod pump technology and metallurgy. Only changes way liquid exits downhole rod pump and travels to surface. Provides a tubing/hollow rod annulus Sucker Rod Pumping Workshop 2

3 Double String Pumping System Development In 2006 my Engineering Manager Rob Stanfield challenged me to develop artificial lift for slimhole wells with 2-7/8 casing. In developed Slim Hole Hollow Rod Pump concept solution Installed five Slim Hole Hollow Rod Pumps and tested Developed Double-String System Concept Installed two with fifteen more scheduled to install Sucker Rod Pumping Workshop 3

4 Slim hole Hollow Rod Pump Rod Pump 4-1/2 casing or larger Gas is produced up casing annulus. Production Tubing Water is pumped up 2-3/8 tubing string. Sucker Rods Reciprocate 2010 Sucker Rod Pumping Workshop 4

5 Slim Hole Hollow Rod Pump Mcfd 2010 Sucker Rod Pumping Workshop 5

6 Double String Pump Rod Pump Gas is produced up casing annulus. Water is pumped up 2-3/8 tubing string Sucker Rod Pumping Workshop 6

7 Double String Pumping System Low Liquid Volume Intermittent Pumping Developed to facilitate intermittent pumping of low liquid volumes laden with solids (coal fines or sand). Lifts solids due to higher liquid velocity in small diameter hollow rod string. Prevents solids from falling back onto and into the pump. Advances liquid and solids upward every stroke or POC cycle due to ball checks. Provides rod/tubing annulus for many uses. Can be configured to eliminate gas locking Sucker Rod Pumping Workshop 7

8 Sucker Rod Pumping Solids Rod Pump Gas is produced up casing annulus. Water is pumped up 2-3/8 tubing string Sucker Rod Pumping Workshop 8

9 Sucker Rod Pumping Solids Rod Pump Low Liquid Rates Intermittent Pumping Solids begin to settle and build on top of pump Sucker Rod Pumping Workshop 9

10 Sucker Rod Pumping Solids Rod Pump 2-3/8 tubing BPD = ½ FPS 32% of our coal well failures are due to stack outs, wear, and tubing failures. 68% of our coal well pump failures are due to fill Sucker Rod Pumping Workshop 10

11 Double String Pumping Solids Double String Pump Clean chemically treated liquid to control pump environment in tubing annulus. 1 IJ tubing - 46 BPD = ½ FPS Gas is produced up casing annulus. Liquid is pumped up hollow rod/tubing string Sucker Rod Pumping Workshop 11

12 Double String Pumping System Pumping Liquid with Solids Solids such as coal fines and or sand pass through the pump up through the hollow rods to surface Liquid velocity in small diameter hollow rod string keeps solids moving. Multiple checks keep solids from falling down to the pump. Clean liquid slippage (from surface down tubing/hollow rod annulus) flushes and lubricates plunger/barrel contact. Balanced pressures at the pump (hollow rod vs. tubing annulus) prevents solids invasion between barrel and plunger 2010 Sucker Rod Pumping Workshop 12

13 Hollow Rod Ball Checks Double String Pump Ball checks enable intermittent pumping Sucker Rod Pumping Workshop 13

14 Norris Mold On Rod Guides Pulled hollow rod/tubing string from slimhole well after 2-1/2 years service the only hollow rod string we have pulled to date. 4/22/ Sucker Rod Pumping Workshop 14

15 Norris Mold On Rod Guides 2010 Sucker Rod Pumping Workshop 15

16 Double String Pumping System Uses of the Double String Annulus Balance system to flush, lubricate, and directional slippage control. Provide additional liquid to slurry solids. Closed loop chemical treatment. Chemical treatment delivery anywhere in the wellbore eliminates need for capillary string. Filled with lubricant to reduce wear and friction Sucker Rod Pumping Workshop 16

17 Acknowledgements Thanks to contributors Rob Stanfield, Manager Artificial Lift Engineering COP Dave Allison, Beam Unit Specialist, COP Tom Cochrane, and Rod Pump Team, COP Gary Noyes, Energy Pump, Farmington, NM 2010 Sucker Rod Pumping Workshop 17

18 Hollow Rod Surface Configuration 2010 Sucker Rod Pumping Workshop 18

19 Copyright Rights to this presentation are owned by the company(ies) and/or author(s) listed on the title page. By submitting this presentation to the Sucker Rod Pumping Workshop, they grant to the Workshop, the Artificial Lift Research and Development Council (ALRDC), and the Southwestern Petroleum Short Course (SWPSC), rights to: Display the presentation at the Workshop. Place it on the web site, with access to the site to be as directed by the Workshop Steering Committee. Place it on a CD for distribution and/or sale as directed by the Workshop Steering Committee. Other use of this presentation is prohibited without the expressed written permission of the author(s). The owner company(ies) and/or author(s) may publish this material in other journals or magazines if they refer to the Sucker Rod Pumping Workshop where it was first presented Sucker Rod Pumping Workshop 19

20 Disclaimer The following disclaimer shall be included as the last page of a Technical Presentation or Continuing Education Course. A similar disclaimer is included on the front page of the Sucker Rod Pumping Web Site. The Artificial Lift Research and Development Council and its officers and trustees, and the Sucker Rod Pumping Workshop Steering Committee members, and their supporting organizations and companies (here-in-after referred to as the Sponsoring Organizations), and the author(s) of this Technical Presentation or Continuing Education Training Course and their company(ies), provide this presentation and/or training material at the Sucker Rod Pumping Workshop "as is" without any warranty of any kind, express or implied, as to the accuracy of the information or the products or services referred to by any presenter (in so far as such warranties may be excluded under any relevant law) and these members and their companies will not be liable for unlawful actions and any losses or damage that may result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information which therein may be contained. The views, opinions, and conclusions expressed in these presentations and/or training materials are those of the author and not necessarily those of the Sponsoring Organizations. The author is solely responsible for the content of the materials. The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources. The Sponsoring Organizations provide these presentations and/or training materials as a service. The Sponsoring Organizations make no representations or warranties, express or implied, with respect to the presentations and/or training materials, or any part thereof, including any warrantees of title, non-infringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose Sucker Rod Pumping Workshop 20

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