OIL WELL PUMPING UNIT Russian patent published in 1999 - IPC

FIELD: oil producing industry. SUBSTANCE: tubing string and pump installed on string. Tubes are made of polymeric material with multiple layer high-strength perforated frame placed inside tubing walls along their generatrices. pump is made of polymeric material reinforced by high strength frame. Roughness of working surfaces of tubes and pump is from Ra 1.0 to Ra 0.25, and ultimate strength of material used for manufacture of frame is not less than 1000 MPa. EFFECT: increased corrosion resistance of main members of pumping unit, reduced hydraulic losses. 2 dwg