METHOD OF DEVELOPMENT OF NONUNIFORM FORMATIONS WITH CYCLIC WATERFLOODING Russian patent published in 1997 - IPC

FIELD: oil producing industry. SUBSTANCE: method of development of nonuniform formations with cyclic waterflooding includes cyclic reduction and increase of pressure in formation by injection of water through injection wells, injection of polymer aqueous solution with subsequent oil withdrawal from producing wells, and additional injection of suspension of dispersed particles. In so doing, injection of polymer aqueous solution is alternated with injection of suspension of dispersed particles. EFFECT: higher efficiency of the method of development of nonuniform formations by waterflooding due to alternation of cyclic water flooding with injection of polymer aqueous solution with suspension of dispersed particles, fuller oil recovery from waterflooded nonuniform formation. 2 tbl