OIL-WELL SUCKER-ROD PUMP DRIVE Russian patent published in 2000 - IPC

FIELD: oil producing industry; oil well operation. SUBSTANCE: drive has engine, mechanism converting rotation into reciprocating motion, driving pulley and curvilinear guide member over which endless flexible member is passed. Flexible member is coupled with carriage connected with counterweight installed in guides and coupled though opened link with sucker rod string. Counterweight is made so that its gravity center is located in plane passing through axis of endless flexible member. Curvilinear surface of guide member, engaging with endless flexible member, is made with variable radius of curvature. Location of counterweight gravity center in plane passing through axis of endless flexible member eliminates additional load in plane perpendicular to plane passing through axis of endless flexible member. Owing to the fact that curvilinear surface of guide member engaging with endless flexible member is made with variable radius of curvature, length of stroke of plunger of sucker-rod pump is increased at constant speed of endless flexible and length of travel of sucker-rod hanger point. EFFECT: enlarged operating capabilities. 2 cl, 6 dwg