METHOD FOR DEVELOPMENT OF OIL FIELDS WITH NONUNIFORM HIGHLY AND LOW PERMEABLE RESERVOIRS Russian patent published in 1995 - IPC

FIELD: oil producing industry. SUBSTANCE: oil is recovered through producing wells and displacing agent is injected through injection wells. Injected in formation are calculated volumes of fringes of low viscosity (up to 5 mPas) of first component, displacement fluid - second component. At preset distance from injection line, highly viscous solution (up to 200 mPas) in intercalation with high permeability is generated. In this case, density of first component is taken higher than the second component, and their initial viscosity values are taken on the condition ensuring maximum pressure differential between intercalations. EFFECT: higher efficiency. 2 dwg