COMPOUND FOR INSULATION OF INFLUX OF STRATAL WATER Russian patent published in 2003 - IPC

FIELD: oil production. SUBSTANCE: compound for insulation of influx of stratal water for period of repair of injection wells, for sealing cracks, washouts formed in its walls includes exopolysaccharide produced by strain Azotobacter vinelandii (Lipman) ФЧ-1 ВКПМ B-5933 in the form cultivated fluid, clayey silicate mineral and water. Compound is injected with chrome-potassium alum in addition and mountain cork is utilized in the capacity of clayey silicate mineral with following proportion of components, mas.%: exopolysaccharide, 50.0-15.0; chrome-potassium alum, 0.05-0.15: mountain cork. 2.5- 7.5; water, the balance. Compound provides for increased resistance to washout of water forced into well, for possibility of conducting insulation operations in wide interval of temperatures and substantially raises efficiency of utilization of chemical reagents. EFFECT: substantially raised efficiency of utilization of chemical reagents. 2 dwg, 2 tbl