METHOD OF OIL POOL DEVELOPMENT Russian patent published in 2003 - IPC

FIELD: oil producing industry, methods of development of oil pools presented by nonuniform formations. SUBSTANCE: method includes injection into formation of aqueous solution of sodium silicate and suspension of zeolite-containing rock preliminarily treated with hydrochloric acid, allowing the process to stand for some time and injection of displacement agent, and additional injection of aqueous solution of cellulose ether. Displacement agent is used in form of water or of aqueous solution of surfactant. Injection of aqueous solutions of cellulose ether and sodium silicate, suspensions of zeolite-containing rock preliminarily treated with hydrochloric acid is carried out simultaneously or successively. EFFECT: increased oil recovery from formations and reduced water-encroashment of wells at late stage of pool development. 2 cl, 1 tbl