rotaflex 1

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Weatherford International Ltd.

515 Post Oak Blvd., Suite 600

Houston, Texas 77027 USA

Tel: 713-693-4000

www.weatherford.com

Rotaflex ® Long-Stroke Pumping Unit

The Rotafex unit is Weatherford’s long-stroke

pumping unit for sucker-rod pumps. Using proven

technology and design innovations, the unit

provides greater efciency and cost effectiveness

for pumping deep, troublesome, and high-volume

wells; and with the Rotafex unit, sucker-rod

pumps can be used for applications where electric

submersible or hydraulic subsurface pumps wereonce required.

Long pump stroke (up to 366 in., or 9.3 m)

and virtually no minimum speed provide more

complete pump llage and lower dynamic loading.

Dynamometer cards run on Rotafex applications

are similar to a theoretically perfect card. Pumping

with the Rotafex 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 Rotafex unit is safe

and simple. After the bridle and carrier bar are

disconnected from the polished rod, the Rotafex

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 failures

Operations requiring energy savings•

Applications

Reciprocating Rod Lift

© 2007 Weatherford. All rights reserved. 843.02







Tel: 713-693-4000

www.weatherford.com© 2007 Weatherford. All rights reserved. 843.02


Extended stroke length and unique design make the• Rotafex

unit signicantly more efcient 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 efciency and reliability.

Long pump stroke and virtually no minimum speed provide•more complete pump llage and lower dynamic loading.

The• Rotafex 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•eld 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 reducingstress 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 Benefts

Downstroke Position

Upstroke Position






Tel: 713-693-4000

www.weatherford.com


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

Specifcations


© 2007 Weatherford. All rights reserved. 843.02

Model 900 1100 1150 1151

Reducer torque (in.-lbf, kN•m)320,00036.16

420,00047.45

Stroke length (in./m)2887.3

3067.8

3669.3

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 )

9,4004,264

9,8004,445

Auxiliary counterweight (lb/kg )21,9809,969

30,20013,698

Total weight (lb/kg )31,38014,234

40,00018,144

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

6.64 × 2.38 × 12.3423.8 × 8.5 × 44.5

7.25 × 2.59 × 13.56 23.8 × 8.5 × 49.5

7.25 × 2.59 × 15.0923.8 × 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 × 2.7444.5 × 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 ) 42,90019,459

52,30023,723

53,88024,440

55,00024,948

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

7.32 × 2.62

Base weight (lb/kg )29,00013,154

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

Load belt dimensions, L × W (in./m)390.0 × 42.09.91 × 1.07

406.0 × 50.010.3 × 1.27

466.0 × 50.011.84 × 1.27

466.0 × 50.011.84 × 1.27

Load belt tensile strength, PIW (lb/kg )10,0004,536

Automatic brake system Yes







Tel: 713-693-4000

www.weatherford.com© 2007 Weatherford. All rights reserved. 843.02

Weatherford products and services are subject to the Company’s standard terms and conditions, available on requestor at www.weatherford.com. For more information contact an authorized Weatherford representative. Unless notedotherwise, trademarks and service marks herein are the property of Weatherford. Specications are subject to changewithout notice. Weatherford sells its products and services in accordance with the terms and conditions set forth in theapplicable contract between Weatherford and the client.


Weatherford’s hydraulically powered• Rotafex rollback system for moving and repositioning the Rotafex

long-stroke pumping unit is available for new installations of Rotafex long-stroke pumping units and can

also be retrotted to previously installed pumping units.

Gas-engine extensions.•

Wire-mesh safety fences.•

Variable frequency drive.•

Options

rotaflex 1

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