METHOD OF SHUTOFF OF FORMATION WATER INFLOW Russian patent published in 1998 - IPC

FIELD: methods of shutoff of formation water inflow to injection and producing wells to ensure blocking of water-washed intervals of formation. SUBSTANCE: method includes successive injection of solutions of alkali agent and aluminium salt in ratio of (1-6):1 and subsequent injection of alkali agent or calcium chloride solution. Alkali agent is used in for of sodium salt of polybasic acid or sodium anionic surfactant. Aluminium salt is used in form of aluminium chloride, aluminium sulfate or aluminium-sodium sulfate. Method is realized by injection into formation of reagent aqueous solutions. EFFECT: higher efficiency. 3 cl, 1 tbl