METHOD FOR MINE DEVELOPMENT OF OIL FIELD WITH NONUNIFORM FRACTURED RESERVOIRS Russian patent published in 1994 - IPC

FIELD: mine development of oil fields. SUBSTANCE: injection wells are located along and cross fracture spreading. Used as isolating material injected into injection wells is regulating viscoelastic system which is injected after steam breakthrough into producing wells. Injection of said material is alternated with injecting of steam. Simultaneously or after successive injection into injection wells of steam and regulating viscoelastic system, isolating foam compound is injected into producing wells, into which steam has broken through, by intervals of formation from top to bottom up to complete decrease of their intake rate. After that injection of steam is continued into injection wells with pressure exceeding the initial one. Used as isolating foam compound injected into wells is compound containing, mas. % : foamer DS-RAS 0.5-10; magnesium chloride crystal hydrate or bishofite 3.0-6.0; water glass or sodium metasilicate 3.0-6.0; water is the balance; with water glass-to-bishofite ratio of (1-2): 1. EFFECT: higher efficiency. 1 tbl