METHOD FOR CONTROL OF HETEROGENEOUS OIL BED PERMEABILITY Russian patent published in 2009 - IPC E21B43/22 

FIELD: oil and gas production.

SUBSTANCE: invention is related to oil and gas production industry, in particular, to methods for displacement of residual oil, which reduces permeability of watered beds, involves low-permeable oil-saturated sections in development and increases oil recovery. In method for control of heterogeneous oil bed permeability, including injection of water suspension of slurry - waste of soda production from rapidorr settlers in bed between separating fringes of fresh water, its forcing through by fresh water fringe in volume equal to volume of specified suspension, well shutdown for 24 hours, mentioned water suspension of slurry - waste of soda production from rapidorr settlers - is represented by slurry from the last production stage of the following composition, g/l: chemical chalk - 80.0-90.0, calcium oxide hydrate - 2.0-10.0, magnesium hydroxide - 4.0-5.0, calcium sulfate - 0.4-0.6, sodium chloride - 300, sodium hydroxide - 2.0, admixtures and water - the rest, additionally mineralised drain water is pumped with density of 1.107 g/cm³.

EFFECT: creation of efficient method for control of permeability of heterogeneous oil bed due to reduction of permeability in highly permeable zones of water saturated header.

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