METHOD OF DEVELOPMENT OF WATER-ENCROACHED OIL POOLS WITH ZONAL NONUNIFORM AND DIFFERENT IN PERMEABILITY FORMATIONS Russian patent published in 2003 - IPC

FIELD: development of oil deposits; applicable in development of water-encroached zonal nonuniform oil deposits with argillaceous reservoirs. SUBSTANCE: method includes tapping of oil pool by, at least, one injection and several producing wells. Injected into injection well are fringes of agent increasing filtration resistance of porous medium, and water. During injection of reagents, operating conditions of producing and injection wells are varied. In this case, producing well located in argillaceous reservoir is disconnected. Injected successively into injection well are fringe of agent increasing the filtration resistance of porous medium and a portion of fringe of stabilizing composition. Then, injection well is disconnected and time is delayed sufficient for redistribution of filtration flows. After said time interval, producing well located in argillaceous reservoir and injection well are opened. The second portion of stabilizing composition is injected and common waterflooding is undertaken. Injection pressure in injection well is maintained invariable and corresponding to pressure of product withdrawal from producing wells. EFFECT: higher efficiency of offered method and its extended potentialities due to involving into development of argillaceous reservoirs and increased covering of formations by waterflooding. 4 dwg, 1 tbl