COMPOUND FOR ISOLATION OF HIGH-PERMEABLE ZONES OF RESERVOIR Russian patent published in 1997 - IPC

FIELD: oil and gas industry. SUBSTANCE: this relates to isolation of high-permeable water-saturated intervals in carbonate reservoir. Isolating compound intended for injection into reservoir is liquid which directly inside reservoir is frothing with creation of solid-phase foam possessing high structural-mechanical properties due to action of aluminium hydrogel and mineral particles. In case of necessity, solid-phase foam can be completely destroyed by injecting acid into well. Isolating compound contains used liquid drilling clay mud of 12.5-27% concentration, mineral particles and 17-25% water solution of aluminium oxichloride which is waste from catalytic complex of alkylation process. Aluminium oxichloride solution is used in amount of 0.5-1.5 volumes for 10 volumes of used drilling mud. EFFECT: high efficiency. 1 tbl