METHOD OF DEVELOPMENT OF NONUNIFORM ZONE OIL DEPOSIT Russian patent published in 2003 - IPC

FIELD: development of oil deposits; applicable in development of waterflooded nonuniform zone oil deposit with argillaceous reservoirs. SUBSTANCE: method includes drilling of producing and injection wells, cyclic injection of water and periodic withdrawal of product through producing wells, shutting-in of producing well with attaining of formation waterflooding, injection into injection well of surfactant fringe and forcing if over formation by water. Producing well located in argillaceous reservoir is shut-in with attaining of formation waterflooding of 50-99%, injected into injection well is fringe of polymer and forced over formation by water. Then, producing wells being in reciprocal influence are shut-in, and producing well in argillaceous reservoir is opened. Fringe of surfactant solution is forced into injection well by highly mineralized formation water. Then, wells being in reciprocal influence are opened, and products are withdrawn from all producing walls with cyclic injection of highly mineralized water. Polymer may be used in form of cross-linked polymer systems. Surfactant is used in form of compositions based on nonionic and anionic substances. Technical result consists in increased efficiency of oil displacement due to involving into development of argillaceous reservoirs and increased coverage of formation by waterflooding. EFFECT: higher efficiency of method. 2 cl, 4 dwg, 1 tbl, 1 ex