METHOD FOR SELECTIVE ISOLATION OF WATER INFLOW IN WELL Russian patent published in 1997 - IPC

FIELD: oil and gas production industry. SUBSTANCE: this relates to water inflow of producing and injection wells. Effective isolation is achieved due to wider embracing, plugging ability and expansion of technological potentialities. According to method, injected into well is mineralized water of chlorine calcium type and 5-7% water solution of sodium aluminate. Prior to injection of sodium aluminate, injected into well is dividing fluid at following relation of components, mass %: mineralized water 40; dividing component 10; 3-5% solution of aluminate 50. Used as dividing component is light oil. EFFECT: high efficiency. 1 cl, 1 tbl