FIELD: oil-gas producing industry, particularly, methods of residual oil displacement reducing permeability of water-encroached formations and involving in development of low- permeability oil-bearing sections and increasing oil recovery. SUBSTANCE: method includes injection into formation through injection wells of aqueous suspension of chalk with subsequent injection of aqueous solution of metal salts, and oil recovery through producing wells. Said chalk suspension of slime from Dorr setters. It is injected between fringes of fresh water. Aqueous suspension of slime from Dorr settlers is waste of soda production. Aqueous solution of metal salts is used in form of mineralized sewage water. EFFECT: provided efficient method of control of permeability of nonuniform oil formation due to reduced permeability of high-permeability zones of water-saturated reservoir. 2 tbl, 2 ex
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Authors
Dates
2003-09-20—Published
2002-01-08—Filed