OIL-WELL SUCKER-ROD PUMP Russian patent published in 2004 - IPC

FIELD: oil producing industry; handling of formation fluids. SUBSTANCE: proposed pump contains housing connected by collar to tubing string. Cylinder with piston connected by rod with tubing string is installed in housing to form delivery space. Cylinder is sealed relative to rod in housing. Bypass holes are made in lower part of cylinder. Suction valve contains cylindrical housing with holes on side walls being installed by means of spring in fixed cylindrical cup. The latter is provided with holes in side walls and is installed in oil space formed between bottom of housing and bottom of cylinder. Pump is provided with at least four delivery valves, also made cylindrical, and having holes in side walls. Valves are installed in upper part of cylinder in fixed cylindrical cup with holes. Bypass channels are formed between upper part of cylinder and housing. EFFECT: reduced energy consumption and mechanical loads on tubing string, increased service life of tubing string. 1 dwg