WELL BOTTOM-HOLE PUMP CHAIN DRIVE Russian patent published in 2015 - IPC F04B47/02 

FIELD: oil and gas industry.

SUBSTANCE: drive includes a body, an engine and a reduction gear mounted on the base on a single frame. In the body there is a driving sprocket and an idler sprocket covered by a closed hauling chain coupled to a carriage connected to a counterbalance. The latter is of a flat-topped shape in the cross-section; it is installed in guides with the chain placement in its open cavity. Vertical axes of symmetry of a transforming mechanism, counterbalance and binder are placed in direct vicinity from the same vertical plane. It contains a mechanism for a drive recoiling from the wellhead and a tape of a flexible non-metal elastic material that connects the counterbalance element to the unit of a rod basket. A drum for the communication of the rod basket unit with the tape is set so that it can be rotated around the horizontal axis. Guide pulleys of the counterbalance rollers are made of a non-metal material. The tape of the flexible non-metal elastic material in the rod basket unit is equipped with a whipstock with the total weight bigger than the tape weight and the lower part of this whipsrock is made with a wedge-shaped lower part installed so that it can contact the rod basket unit.

EFFECT: improved operational reliability of the drive.

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