OIL-WELL SUCKER-ROD PUMP Russian patent published in 2006 - IPC F04B47/00 

FIELD: oil producing industry.

SUBSTANCE: invention is designed for use in inclined wells with high gas-oil ratio. Proposed oil-well sucker-rod pump contains cylinder with suction valve installed on lower end of tubing, hollow plunger with delivery valve of lower arrangement installed in cylinder for reciprocating and connected with sucker-rod string. Hollow plunger has longitudinal inner closed channel whose lower end communicates with underplunger space of cylinder and upper end, with overplunger space of tubing at moment of getting out of upper end of channel from cylinder when hollow plunger approaches its upper operating position. Proposed pump is easy to manufacture and makes it possible to increase reliability and efficiency of inclined well at high oil-gas ratio and it can be used both for pumping liquid with high content of free gas and high viscosity oil and emulsion owing to provision of hydromechanical forced closing of pump operating valves.

EFFECT: improved reliability and efficiency in operation.

3 dwg