ROD PUMPING UNIT FOR DOWNHOLE LOCAL WATER PUMPING Russian patent published in 2009 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: invention relates to oil production, namely to pumping units to force extracted local water into petroliferous stratum to keep up formation pressure therein. The proposed unit comprises a casing string coupled with a deep-well pump incorporating a cylinder with suction valve and a plunger with pressure valve lowered into operating well string with perforated parts opposite the petroliferous stratum and water producing formation. The wall packer is fitted on the pumping pipe string end and closes the hole clearance above the water producing formation. The tubular pump is arranged in the pumping pipe string above its end. The cylinder is furnished with lateral holes arranged at such a level that, with the plunger in its BDC, the said holes are open and communicate hydraulically the pumping pipe string inner space with the wall hole clearance above the packer, and, with the plunger in TDC, the said holes are blocked.

EFFECT: possibility to use whatever-type pump, to adjust forcing water a integral system of keeping up formation pressure and to exploit petroliferous stratum free areas with weakly-permeable reservoirs thanks to independent pumping in.

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