UNIT BOREHOLE ROD PUMPING WITH DOUBLE-ACTING PUMP Russian patent published in 2009 - IPC E21B43/00 E21B43/38 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to petroleum industry and can be used for operation of high-flooded wells. Unit with double-acting pump for well with boring casing, two uncovers and packer, located between uncovers, contains piston, cylinder with bottom forcing valve, top and bottom inlet openings with suction valves, located over packer and, agreeably, higher and lower the piston, plunger with top delivery valve, implemented, as the piston, with ability of reciprocating motion, pipe string, on which into well it is chuted sucker-rod pump, inlet of which by means of pipe string is communicated through the top pressure valve to the wellhead, and through the bottom pressure valve - to under packer space. According to the invention piston is implemented with the ability of sequence for plunger upward ensured by pressure drop over this piston and under this piston up to intercommunication of piston chamber to top inlet opening for inflow through this hole of oil into piston chamber until, plunger would stop uppermost position, and its following displacement downward by plunger under weight action of strings up to its downward most position. Additionally at increasing of water cut of oil it is provided ability of strings allowance downward, and at reduction of water cut - grasp of strings.

EFFECT: effectiveness increase of oil extraction from watered field well ensured by ability of changing during the process of well operation of liquid amount percentage, elevated into mouth, and liquid amount, pumped into underseam at changing of water cut of well products.

2 cl, 3 dwg