BOREHOLE PUMP UNIT Russian patent published in 2014 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to oil production and may be used for oil extraction from deep wells at simultaneous operation of two and more seam at high content of solids in pumped fluid, fluid high thickness, etc. Proposed unit comprises tubing, parker and two pumps with appropriate housings, suction and discharge valves and working tools. Lower pump intake communicates via its suction valve under-parker space while upper pump intake communicates with above-parker space via its suction valve. Pump are equipped fluid drives working fluid is contained in pipes communicated with bypass channel to feed said fluid to drive unit. Heavy buffer fluid is arranged at pumps bottoms, downstream of suction valve, to make hydraulic locks. And, to interact with pumped fluid in pump chambers and with working fluid in piping. Valves with seats of positive buoyancy in heavy buffer fluid are fitted in pumps pipes at interface between heavy buffer fluid and working fluid. Note here that said seats are arranged at working pipes bottom parts.

EFFECT: higher reliability and efficiency, lower costs, and longer life.

1 cl, 4 dwg