rotaflex long-stroke pumping unit specs.pdf · weatherford international ltd. 515 post oak blvd.,...

Weatherford International Ltd.515 Post Oak Blvd., Suite 600Houston, Texas 77027 USATel: 713-693-4000www.weatherford.com

Rotaflex® Long-Stroke Pumping UnitThe Rotaflex unit is Weatherford’s long-stroke pumping unit for sucker-rod pumps. Using proven technology and design innovations, the unit provides greater efficiency and cost effectiveness for pumping deep, troublesome, and high-volume wells; and with the Rotaflex unit, sucker-rod pumps can be used for applications where electric submersible or hydraulic subsurface pumps were once required.

Long pump stroke (up to 366 in., or 9.3 m) and virtually no minimum speed provide more complete pump fillage and lower dynamic loading. Dynamometer cards run on Rotaflex applications are similar to a theoretically perfect card. Pumping with the Rotaflex unit reduces stress on equipment because the rod string is operated at relatively constant velocities. Constant velocity and fewer strokes per barrel increase the life span of the pumping unit, downhole pump, and rod string.

Servicing a well with the Rotaflex unit is safe and simple. After the bridle and carrier bar are disconnected from the polished rod, the Rotaflex unit rolls away from the wellhead without any disassembly. After a workover is completed, the unit is rolled back into place, and the carrier bar is reconnected to the polished rod.

High-volume and high-load wells• Deviated and horizontal wells• Wells that experience frequent downhole • equipment failuresOperations requiring energy savings•

Applications

Reciprocating Rod Lift

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Rotaflex® Long-Stroke Pumping Unit

Extended stroke length and unique design make the • Rotaflex unit significantly more efficient than other pumping units. Savings in energy costs typically range from 15 to 25 percent. Constant velocity and fewer strokes per barrel increase the • life span of the pumping unit, downhole pump, and rod string.Extended stroke length allows for fewer cycles and reversals, • resulting in increased system efficiency and reliability. Long pump stroke and virtually no minimum speed provide • more complete pump fillage and lower dynamic loading.The • Rotaflex unit is shipped in one piece for ease of service and installation.Longer downhole stroke provides better pump compression • ratio to help eliminate gas-lock problems.The unique mechanical reversing mechanism is proven in the • field for over 20 years. Long-life, heavy-duty load belt, used to link the power train to • the rod string, acts as a shock absorber, effectively reducing stress on the entire system.The short radius of the torque arm markedly reduces required • torque demand and allows the use of a smaller prime mover and gear reducer, which are less expensive to buy and operate.

Features, Advantages and Benefits

Downstroke Position

Upstroke Position



*Higher speeds are attainable with variable frequency drive, increasing production by as much as 25%.

Specifications



Model 900 1100 1150 1151

Reducer torque (in.-lbf, kN•m) 320,000 36.16

420,000 47.45

Stroke length (in./m) 288 7.3

306 7.8

366 9.3

Maximum polished rod weight (lb/kg) 36,000 16,329

50,000 22,680

Maximum speed* (spm) 4.50 4.30 3.64 3.75

Minimum speed (spm) No absolute minimum

Weight of counterweight assembly (lb/kg)

9,400 4,264

9,800 4,445

Auxiliary counterweight (lb/kg) 21,980 9,969

30,200 13,698

Total weight (lb/kg) 31,380 14,234

40,000 18,144

Unit dimensions, L × W × H, (ft/m) 21.8 × 7.8 × 40.5 6.64 × 2.38 × 12.34

23.8 × 8.5 × 44.5 7.25 × 2.59 × 13.56

23.8 × 8.5 × 49.5 7.25 × 2.59 × 15.09

23.8 × 8.5 × 49.5 7.25 × 2.59 × 15.09

Unit shipping size, L × W × H, (ft/m) 40.5 × 7.8 × 9.0 12.34 × 2.38 × 2.74

44.5 × 8.5 × 10.5 13.56 × 2.59 × 3.20

49.5 × 8.5 × 10.5 15.09 × 2.59 × 3.20

49.5 × 8.5 × 10.5 15.09 × 2.59 × 3.20

Unit shipping weight (lb/kg) 42,900 19,459

52,300 23,723

53,880 24,440

55,000 24,948

Base dimensions, L × W (ft/m) 24.0 × 8.5 7.32 × 2.62

Base weight (lb/kg) 29,000 13,154

Working temperature (°F/°C) –40° to +140° –40° to +60°

Load belt dimensions, L × W (in./m) 390.0 × 42.0 9.91 × 1.07

406.0 × 50.0 10.3 × 1.27

466.0 × 50.0 11.84 × 1.27

466.0 × 50.0 11.84 × 1.27

Load belt tensile strength, PIW (lb/kg) 10,000 4,536

Automatic brake system Yes




Weatherford products and services are subject to the Company’s standard terms and conditions, available on request or at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless noted otherwise, trademarks and service marks herein are the property of Weatherford. Specifications are subject to change without notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in the applicable contract between Weatherford and the client.


Weatherford’s hydraulically powered • Rotaflex rollback system for moving and repositioning the Rotaflex long-stroke pumping unit is available for new installations of Rotaflex long-stroke pumping units and can also be retrofitted to previously installed pumping units. Gas-engine extensions.• Wire-mesh safety fences.• Variable frequency drive. •

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rotaflex long-stroke pumping unit specs.pdf · weatherford international ltd. 515 post oak blvd.,...

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