METHOD OF DEVELOPMENT OF MULTIHORIZON OIL DEPOSIT Russian patent published in 2000 - IPC

FIELD: oil producing industry. SUBSTANCE: method provides for location of wells by cluster method on allocated area of deposit development according to authorized program; determination of reservoir properties of horizons in section; cyclic injection of formation water through injection wells and oil withdrawal through producing wells. In this case, first, injection wells are drilled with deepening of bottom under lower operated object up to drilling-in of water-bearing horizon. Then, producing wells are drilled. In so doing, if depth marks of producing formations proved to be below water-oil contact, or zones of lithological replacement with nonreservoir are drilled-in, bottom of well is deepened up to drilling-in of said water-bearing horizons. Upon completion of drilling of area of well cluster, with consideration of obtained maximum possible well geological information, wells are grouped in single development system with respect to lower horizon, and flooding, in this case, through injection wells is accomplished by intrawell or interwell pumping of water from said water-bearing horizon, or saline drinking waters from upper horizons found on territory of developed area. EFFECT: reduced technogenic load on upper drinking water complex and also on grouping of wells into single development system with consideration of geological factors. 2 cl, 2 dwg