DEVICE FOR SIMULTANEOUS SEPARATE EXTRACTION OF WELL PRODUCT AND FOR FORCING WATER INTO FORMATION Russian patent published in 2007 - IPC E21B43/14 

FIELD: oil extractive industry, possible use during extraction of oil deposit with extraction of oil and water from its upper formation and forcing of incidentally extracted water into lower formation without raising it to the surface.

SUBSTANCE: device includes casing column perforation in interval of upper productive and lower receiving formations, column of tubing pipes, upper and lower pumps and accumulating chamber. Column of tubing pipes from watered section of productive formation to lower pump is perforated. As dividing chamber, space of well between pumps is used, and as oil accumulating chamber, upper part of well space is used. Used as lower pump is electric centrifugal pump, facing downwards, located below productive formation and having a tail underneath with reverse valve and packer, mounted in well above the ceiling of receiving formation. Upper pump is located in the column of tubing pipes under dynamic level of accumulated oil. Upper and lower pumps are located in the well at distance from each other at maximal possible distance with positioning of perforated section of column of tubing pipes between them as well as of separator pools with inlet and outlet channels. Total productiveness of pumps is selected based on productive capabilities of productive formation liquid-wise, while ratio of productiveness of upper and lower pumps is selected based on amount of water and oil coming into well with condition of ensured gravitational separation of formation liquid on ascending stream of oil and descending stream of water near perforation apertures of productive formation and draining of separated water by means of electric centrifugal pump.

EFFECT: minimization of water saturation of oil being extracted and of oil content in incidentally extracted water forced into lower levels for maintaining formation pressure.

1 ex, 1 dwg