Variable speed well head drive

Details Variable speed well head drive Variable speed well head drive

E - Fixed Constructions

21

B

E21B 33/03 (2006.01)

Patent

CA 2119103

An oil well has a rotary pump driven by a rod string. The rod string is driven by a well head drive including a prime mover, such as an internal combustion engine, a variable ratio transmission and a drive shaft. The system eliminates the high initial cost and high losses associated with hydraulic drives. The drive speed is readily changed using the variable ratio transmission. A shear pin is incorporated in the drive shaft to limit the torqueapplied to the pump drive.

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