METHOD OF FORMATION OF TEMPORARY BARRIER IN FILTER ZONE OF DEVELOPMENT WELL AND EQUALIZATION OF INJECTIVITY PROFILE OF INJECTION WELLS Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry. SUBSTANCE: method includes injection of aqueous solution of reagent in form of calcium chloride into well. Injected into injection of development well with closed casing-wellbore annular space, through filling head installed on wellhead, is mixture of reagents: 8-20% aqueous solution of calcium chloride and sodium naphthenate dissolved in water in ratio for 1:2 at strict pressure monitoring. Mixture is injected in amount of 0.4-1.5 cu.m per meter of formation thickness, and then, forced into formation. Process of injection of reagent solution is repeated in case of absence of symptoms of reduction of absorption volume. EFFECT: equalized injectivity profile in injection wells for increased coverage of formation by flooding, provided temporary barrier in region of filter zone of development well. 2 cl, 2 ex