Downhole pump drive head assembly

Wells – With below and above ground modification – Eduction pump or plunger in well

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E21B 4300, F16D 910

Patent

active

057494169

ABSTRACT:
A downhole pump drive head assembly for driving the rod string which rotates the rotor of a downhole pump, includes a body 12 provided with upper and lower bearings 14,16, in which is rotatably mounted a drive shaft 22, which carries, for rotation therewith, a polish rod 20 of the rod string. A hydraulic retarder 28 is mounted on the body 12 and includes a stator turbine 30, and a rotor turbine 32, the rotor turbine being mounted with respect to the shaft 22, for example by means of a free wheel mechanism 42.
The hydraulic retarder, therefore, operates to control rotation and prevent back-spin of the rod string.

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patent: 5573063 (1996-11-01), Morrow

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