DEVELOPMENT METHOD OF MULTILAYER NON-HOMOGENEOUS OIL DEPOSIT Russian patent published in 2012 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of injection and production wells with vertical and horizontal shafts, pumping of displacement fluid, installation of packers at the boundary of zones of manifolds with various permeability, which is separated with non-permeable interlayers and extraction of products from wells. Shafts of production wells are made in inclined direction and directed at an angle of 45-87°. Opposite all zones of manifold with various permeability there performed is differently directed mining (with total section) of perforation channels of not less than 3×10⁴ mm. After that, filtration-capacitance properties are determined in each mined zone of manifold. If filtration-capacitance properties differ by 1.8-2 times and more, process operations on equalisation of filtration-capacitance properties of manifold zones are performed to provide uniform recovery of field reserves. Each process operation in each of manifold zones is performed by its tight cutout from the rest manifold zones. After that, to the well shaft there lowered is production tubing equipped with water-swellable packers, with perforated holes arranged between them, and those packers are installed at boundaries of manifold zones with various permeability. Then, production tubing is equipped with pump equipment, and the well is brought into operation. At watering-out of manifold zones water-swellable packers are expanded and overlap the perforation holes corresponding to the watered-out zone of manifold. Product extraction is continued from other manifold zones till full watering-out of all manifold zones.

EFFECT: simpler technology and improved efficiency of the method due to equalisation of filtration-capacitance properties of various permeability.

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