1 / 34

Development and field experience of 7/8” with 1” pin sucker rods Use of UHS couplings

Development and field experience of 7/8” with 1” pin sucker rods Use of UHS couplings. Alejandro F. Ameglio – Head Technical Services Tenaris Rods Division. 7/8” with 1” pin sucker rods – UHS Couplings. Contents. 7/8” with 1” pin sucker rods. Field statistics - History Concept Development

hovan
Download Presentation

Development and field experience of 7/8” with 1” pin sucker rods Use of UHS couplings

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Development and field experience of 7/8” with 1” pin sucker rodsUse of UHS couplings Alejandro F. Ameglio – Head Technical Services Tenaris Rods Division

  2. 7/8” with 1” pin sucker rods – UHS Couplings Contents 7/8” with 1” pin sucker rods Field statistics - History Concept Development Field experiences Field evolution Conclusions UHS Couplings Concept Derating factors Technical Data Field experience Conclusions 7/8” with 1” sucker rods – UHS Couplings

  3. 7/8” with 1” pin sucker rods Introduction • This idea is a result of a team work between a major operating company from Argentina (Pan American Energy) and Tenaris • Pan American Energy operates Cerro Dragón Field (south of Argentina) • Field data • Total amount of producing wells: 2193 (7200-8500 ft) • Total Production rate: 123 Mm3/d (774 Mbfpd) • Total oil rate: 13,7 Mm3/d (86,2 Mbfpd) • Total rod pumping wells: 1718 7/8” with 1” sucker rods – UHS Couplings

  4. 7/8” with 1” pin sucker rods Introduction Rod pumping wells Depths: 2193 (7200-8500 ft) Production rates: 120-200 m3/d (750-1250 bfpd) 7/8” with 1” sucker rods – UHS Couplings

  5. 7/8” with 1” pin sucker rods Introduction Due to a secondary recovery process started in 1988, fluid production rates have been continuously raising. This increased the loads levels, and the failures rates at rod strings 7/8” with 1” sucker rods – UHS Couplings

  6. 7/8” with 1” pin sucker rods Field History 7/8” with 1” sucker rods – UHS Couplings

  7. 7/8” with 1” pin sucker rods Field History 7/8” with 1” sucker rods – UHS Couplings

  8. 7/8” with 1” pin sucker rods Field History Main problem to solve 7/8” pin failures 7/8” with 1” sucker rods – UHS Couplings

  9. 7/8” with 1” pin sucker rods Concept - Ideas 7/8” with 1” sucker rods – UHS Couplings

  10. 7/8” with 1” pin sucker rods Analyzing the problem • As a first step, all the factors involved in the problem were analyzed • Training program applied / Control and Inspection at wellhead • Make up practices • Use of displacement cards (API circumferential displacement method) • Make-up torque control method • Lab studies to determine the optimum circumferential displacement for Grade D rods • Pin pre-tension increment (new torque card) After all 7/8” pin failures rates still going up!!! 7/8” with 1” sucker rods – UHS Couplings

  11. 7/8” with 1” pin sucker rods Analyzing the problem • At second stage, different alternatives were evaluated • New threaded connection for sucker rods • Not easy. Long times of development required • There were as much pin failures in HS rods as in Grade D • Material’s resistance increasing THE OIL MEN’S SOLUTION MAKE IT BIGGER!!! 7/8” with 1” sucker rods – UHS Couplings

  12. Solution “The objective was to strenghten the cross section at the stress relief zone for the 7/8” rods” Concept - Ideas 7/8” with 1” pin sucker rods 7/8” with 1” sucker rods – UHS Couplings

  13. Concept - Ideas 7/8” with 1” pin sucker rods HOW? Making a 7/8” rod with 1” pin Development of a new forging technique For fatigue resistance, steel fibers must “copy” the external shape of the element Cutted or whirled steel fibers result in a fatigue failure 7/8” with 1” sucker rods – UHS Couplings

  14. 7/8” with 1” pin sucker rods 7/8” with 1” pin rods – First attempts 7/8” with 1” sucker rods – UHS Couplings

  15. 7/8” with 1” pin sucker rods 7/8” with 1” pin rods – Forging process 7/8” with 1” sucker rods – UHS Couplings

  16. 7/8” with 1” pin sucker rods 7/8” with 1” pin rods Detail of a 7/8” with 1” pin sucker rod showing the steel fibers 7/8” with 1” sucker rods – UHS Couplings

  17. 7/8” with 1” pin sucker rods 7/8” with 1” pin rods Comparison between 7/8” API vs. 7/8” with 1” pin rods 7/8” with 1” sucker rods – UHS Couplings

  18. 7/8” with 1” pin sucker rods Field experience Wells installed – First Lot of field tests A first lot of 1000 7/8” with 1” pin were installed 7/8” with 1” sucker rods – UHS Couplings

  19. 7/8” with 1” pin sucker rods Field experience – Well #A IPA (index) before the installation of 7/8” – 1” pin rods: 0.66 IPA (index) after the installation of 7/8” – 1” pin rods: 0.24 Average running time of conventional API 7/8” rods: 502 days Running time of 7/8”-1” pin rods: 1499 days – 17 MM cycles 7/8” with 1” sucker rods – UHS Couplings

  20. 7/8” with 1” pin sucker rods Field experience – Well #B IPA (index) before the installation of 7/8” – 1” pin rods: 1.30 IPA (index) after the installation of 7/8” – 1” pin rods: 0.21 Average running time of conventional API 7/8” rods: 368 days Running time of 7/8”-1” pin rods: 1684 days – 19 MM cycles 7/8” with 1” sucker rods – UHS Couplings

  21. 7/8” with 1” pin sucker rods Field experience Wells installed – Second lot of field tests 7/8” with 1” sucker rods – UHS Couplings

  22. 7/8” with 1” pin sucker rods Field evolution 7/8” with 1” sucker rods – UHS Couplings

  23. 7/8” with 1” pin sucker rods Conclusions • The new product, fruit of the teamwork between Pan American Energy and Tenaris, has largely overcome the most optimistic expectations. • A 30% reduction in the pin failures was achieved, considering the total amount of oil wells with rod pumping lift systems. • If we referred only to the wells that have this solution, we have reduced the IPA (index of intervention per well per year) approximately in five (5) times. • Today the use of these rods has became standard for all oil well deeper than 2000 mts and with high producing rates, • An increasing of 30% in the fatigue resistance capacity of this rods is only the first step. That conduct us to develop a new premium threaded connection applicable to all of the API conventional rods. 7/8” with 1” sucker rods – UHS Couplings

  24. UHS Couplings (Ultra High Strength) Introduction • Another problem to solve was the one related with failures in 1” SH (Slim Hole) couplings • This problem could be analyzed according with: • Use of 1” SH Class T couplings with Grade D rod strings • Use of 1” SH Class T couplings with HS (High Strenght) sucker rod strings It is well known that SH (Slim Hole) couplings has to be affected by a derating factor in their allowable stress calculations 7/8” with 1” sucker rods – UHS Couplings

  25. UHS Couplings (Ultra High Strength) Derating Factors for SH couplings According to Bradley (Petroleum Engineering Handbook) and Hermanson (LTV Energy), use of SH couplings requires the use of a derating factor that affect the max. allowable stress of the string 7/8” with 1” sucker rods – UHS Couplings

  26. UHS Couplings (Ultra High Strength) No derating factors required Possibility to use 1” API FS Couplings Geometry problems (Tubing 2 7/8”) NO YES Increase the Couplings resistance UHS Couplings Analyzing the problem Problem to solve: 1” API SH Couplings failures 7/8” with 1” sucker rods – UHS Couplings

  27. UHS Couplings (Ultra High Strength) Technical Data UHS Couplings (Ultra High Strength) 7/8” with 1” sucker rods – UHS Couplings

  28. UHS Couplings (Ultra High Strength) Field experience – Field “A” A major independent producer from Argentina operates a field in Neuquén Basin. Well Characteristics • Depths: 6500-8500 ft (2000-2600 m) • Fluid rates: 310-890 bfpd (55-140 m3/d) This field is operated by rod pumping system (250 wells). Main problems to solve are related with 7/8” pins and 1” API Class T SH couplings failures 7/8” with 1” sucker rods – UHS Couplings

  29. UHS Couplings (Ultra High Strength) Field experience – Field “A” 7/8” with 1” sucker rods – UHS Couplings

  30. UHS Couplings (Ultra High Strength) Average service life for 1” SH API Class T couplings 350 days Service life for 1” UHS SH couplings 1350 days Field experience – Well #A IPA (index) before the installation of UHS 1” SH couplings: 1.03 IPA (index) after : 0.8 Largest time in service before UHS couplings: 540 days Running time of UHS 1” Sh Couplings pin : 1350 days – 23 MM cycles 7/8” with 1” sucker rods – UHS Couplings

  31. UHS Couplings (Ultra High Strength) Average service life for 1” SH API Class T couplings 408 days Service life for 1” UHS SH couplings 1125 days Field experience – Well #A Largest time in service before UHS couplings: 940 days Running time of UHS 1” Sh Couplings pin : 1125 days – 14.7 MM cycles 7/8” with 1” sucker rods – UHS Couplings

  32. UHS Couplings (Ultra High Strength) Field experience – Total of wells 7/8” with 1” sucker rods – UHS Couplings

  33. UHS Couplings (Ultra High Strength) Conclusions • Rod pumped wells with high loads could experience failures at sucker rod strings that increase the operative costs of the field. • Assuming a good h&c and make-up practices, that failures are (in general) related with the mechanical resistance of the materials involved. • Both experiences presented are the result of a task force that involves the operators and suppliers (manufacturers). • Those products had shown a very good performance. An important reduction in the number of well interventions, as well as downtimes associated result in a cost reduction for those fields. • The simplicity of these solutions make them easily applicable to diverse well conditions. 7/8” with 1” sucker rods – UHS Couplings

  34. Questions THANKS !!! 7/8” with 1” sucker rods – UHS Couplings

More Related