OIL-WELL SUCKER-ROD PUMP WITH CONTROLLABLE VALVE Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry. SUBSTANCE: proposed pump contains cylinder, plungers, suction valve and sucker rod string. Pump cylinder is made movable relative to tubing string and is furnished with controllable delivery valve and cross-shaped travel limiter connected with pump sucker rod string. Plungers arranged in cylinder are made movable and fixed. Lower end of fixed plunger is connected with hollow rod, and upper end, with suction valve. Lower end of movable plunger is connected with seat of suction valve, and upper end is in contact of cross-shaped travel limiter of movable plunger through suction valve stroke value. Cross-shaped travel limiter of movable plunger is connected by tie-rod with suction valve. Invention improved reliability of pump in operation and pump fill factor owing to prevention of failures at closing of suction and delivery valves by means of forced operation of valves caused by reciprocation of sucker-rod string. EFFECT: improved operation and faultlessness of pump. 2 dwg