METHOD OF OIL DEPOSIT DEVELOPMENT (VERSIONS) Russian patent published in 2000 - IPC

FIELD: oil-producing industry; applicable in restriction of inflow of formation and produced waters to injection and producing wells with high and medium permeability of reservoir irrespective of mineralization of formation waters. SUBSTANCE: method includes injection into formation through injection well of process solution in the form of aqueous solution containing colloidal silica or mixture of water-soluble polymer and colloidal silica, and oil recovery through producing well. Use is made of colloidal silica with silica modulus of 5-7. Process solution is injected into well by 1 to 5 cycles in terms of 1-10 cu.m/m of perforated part of formation. Prior to injection of process solution, displacement fluid is injected into formation. Upon completion of each cycle of injection of process solution and displacement fluid, aqueous solution of mineral salts with ionic force of 0.28 to 5.8 is injected. EFFECT: extended range of means of oil deposit development for provision of high level of oil recovery. 2 cl, 1 tbl, 11 ex