DEVICE FOR SIMULTANEOUS SEPARATE RECOVERY OF WELL PRODUCTION AND PUMPING WATER INTO RESERVOIR Russian patent published in 2011 - IPC E21B43/12 E21B43/14 

FIELD: gas and oil production.

SUBSTANCE: device consists of perforated casing and of chamber-divider with channels for supply of mixture of water and oil and for water removal. Also, the chamber-divider is made in form of a case containing upper and lower chambers divided with a bridge equipped with an axial channel and a shank end wherein there is installed a back spring valve. At least two spring loaded back valves are installed in the said bridge. The lower chamber of the case is equipped with pressure tight secured bush forming a cavity between a low end of the said bridge and an upper end of the said bush. The said cavity is communicated with a lower section of circular space by means of channels made in a lower section of the case. Circular space is formed with internal surface of the casing and external surface of the case. Upper and lower sections of the case have circular cylinder lugs. Also, the upper part of the case is pressure tight connected with a hollow cover in axial channel of which there is installed the back unidirectional spring loaded valve. Back unidirectional spring loaded valves are installed in a side wall of the upper section of the upper chamber of the case. A hollow tube is set inside the upper chamber resting on the bridge of the case and a lower end of its cover. The hollow tube has a row of through orifices. A float equipped with lock valves on ends is positioned inside the tube.

EFFECT: raised efficiency of operation due to self-regulation of water evacuation into water bearing reservoir and discharge of hydrocarbons - into production string.

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