METHOD FOR TREATING BOTTOM-HOLE ZONE OF OIL BED Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this is intended for treating bottom-hole zone of injection wells and producing oil wells in bed. Increased efficiency of method is achieved due to enlarged area covered by treatment as to depth and thickness of oil bed. For this purpose according to method successively injected into well are acid solution and gas-emitting solution. Concentration of gas-emitting agent in gas-emitting solution is selected with taking into consideration complete saturation with gas of solutions being injected under condition of bed pressure and temperature. Ratio of bottom-hole pressure to bed pressure in process of injection is below 2. In addition, prior to injecting acid solution into well, injected is light hydrocarbon liquid with addition of 0.01-1% of cationic surface-active material. EFFECT: higher efficiency. 1 tbl