METHOD FOR DEVELOPMENT OF ZONAL NONUNIFORM OIL DEPOSIT Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: according to method of development, drilled is pattern of producing and injection wells. Then, additional injection wells are introduced. They are brought in operation in low-permeable zones of bed where permeability is higher than in average through low-permeable zones of bed. Injection pressure in these wells is maintained at level of pressure for opening of vertical fissures. In cycles of injecting displacing agent at pressure, producing wells in low-permeable zones of bed are stopped. Mode of operation of producing and injection wells is employed to change direction of filtration flows in bed. This allows for increasing oil recovery due to enlarging range of influence upon low-permeable zone of bed. EFFECT: high efficiency. 1 tbl, 4 dwg