METHOD FOR ISOLATION OF BRINE WATER INFLOW Russian patent published in 1997 - IPC

FIELD: oil and gas industry. SUBSTANCE: method implies equalization of injectivity profile of injection and production wells by isolating water-saturated zones and pool intervals which is achieved by injection of 0.05-2.0% of dispersing filler suspension in carrier liquid and calcium chloride solution. Used in function of dispersing filler is calcium sulfate, technical carbon or silicon dioxide, and used in function of carrier liquid is 0.1-20% solution of polybasic acid salt and monovalent cation, for example ammonia sulfate or sodium silicate. Relation of polybasic acid salt and calcium chloride is taken as equal to 1-(0.5-2.0). Method is realized by successive injection of dispersing filler suspension in carrier liquid and solution of calcium chloride. EFFECT: high efficiency. 2 cl, 1 tbl