METHOD FOR ISOLATION OF BRINE WATER INFLOW Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this relates to isolation of brine water inflow in development of oil deposits by flooding. According to method, initially injected is 3-20% solution of muriatic acid salt, into which preliminarily introduced is 20-60% of calcium chloride from equivalent amount, also introduced is equivalent with respect to solution of muriatic acid salt solution of sodium silicate of 5-40% concentration. After that, injected is solution which contains remaining amount of calcium chloride. Application of aforesaid method allows for creation in water-washed intervals of bed of stable substantial sediment which prevents breakthrough of brine and injected water and thus allows for involving in development stagnant and poorly drained zones of bed. EFFECT: higher efficiency. 2 tbl