METHOD FOR NON-UNIFORM OIL RESERVOIR DEVELOPMENT Russian patent published in 2007 - IPC E21B43/22 C09K8/88 

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons with the use of chemicals or bacterial activity to increase oil output from non-uniform reservoirs and to isolate drowned wells.

SUBSTANCE: method involves injecting dispersion of colloid polyacrylamide or polysaccharide particles, or cellulose ester particles including aluminum poly-oxychloride in reservoir. Above components are taken in the following amounts (% by weight): polyacrylamide or polysaccharide, or cellulose ester - 0.005-0.5, aluminum poly-oxychloride - 0.0015-0.1, remainder is water. Volume of above dispersion is determined as V=π·R²mh, where R is radius of dispersion penetration in reservoir, m, m is mean porosity, parts, h is summary thickness of accommodating intervals, m.

EFFECT: increased reservoir coverage by injection of colloid particle dispersion obtained by intromolecular cross-linking of aqueous suspension of polyacrylamide or polysaccharide, or cellulose ester and aluminum poly-oxychloride, and, as a result, filtering and oil-sweeping properties change in non-uniform reservoir, improved ecological safety and technological efficiency.

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