METHOD FOR DEVELOPMENT OF STRATIFIED NON-UNIFORM OIL DEPOSITS Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: method can be used in treatment of down-hole zones of producing or injection wells in development of oil deposits and also in isolation of interflows beyond strings in wells and in liquidation of old wells. According to method, working agent is injected through injection wells. Oil is recovered through producing wells. At flooding of producing wells, injected into wells is isolating agent based on sodium silicate and muriatic acid. Composition of isolating agent is as follows, mass%: sodium silicate 0.2-10; concentrated muriatic acid 0.2-1.0; polymer 0.011-0.5; wood flour 0.01-3.0; fresh water - the balance. Well is kept under treatment during 24 h and then it is put in operation. EFFECT: higher efficiency. 2 cl, 2 dwg