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

FIELD: oil and gas industry.

SUBSTANCE: drive comprises an engine, reducing gear, rotary-to-reciprocating mechanism that includes head pulley and driven pulley. The top pulley is mounted in the case so that it may rotate and move in limited way along the axis of the rotary-to-reciprocating mechanism in order to regulate tension of a continuous flexible link by means of tightening device consisting of a movable case with the pulley axis coupled to pusher. The pusher of tightening device is made as a hydraulic pair of a cylinder and piston, which movable part supports the top pulley case. The tightening device is made as hydraulic plunger or piston pump interconnected with cavity of the pusher cylinder. The pusher is interconnected with a feeding vessel related to the pump, which movable part is connected to crank mechanism. Rotary part of the mechanism is coupled to a fixed element of the drive case and may interact with movable element of the drive. Service life of the flexible link and rive as a whole is increased, dynamic loads to downhole equipment are reduced.

EFFECT: reduced labour intensity and costs for drive maintenance.

3 dwg