SUCKER-ROD PUMP Russian patent published in 1996 - IPC

FIELD: oil producing industry; pumping out liquid from overlying water-bearing bed to lower pay-out bed at maintenance of reservoir pressure at oil field. SUBSTANCE: pump has cylinder 1 with plunger 2 located in it forming above-plunger chamber 3 and under-plunger chamber 4. Pump is also provided with ball valves 5 and 6. Cylinder 1 is located in casing 7 forming circular chamber 8 between them lower ends of cylinder and casing are rigidly connected with clutch 9 provided with longitudinal passages 10 and radial passages 11. Upper end of cylinder 1 is connected with perforated branch pipe 12 which communicates above-plunger chamber 3 with zone below clutch through circular chamber 8 and longitudinal passages 10 of clutch 9. Radial passages 11 are brought in communication with under-plunger chamber 4. Upper end of casing 7 is rigidly connected with adapter 13. EFFECT: enhanced reliability. 1 dwg