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. Increasing efficiency of method is achieved due to enlarged area covered by treatment as to depth and thickness of oil bed and also due to reduced specific consumption of gas-creating agent. According to method this is achieved by injecting gasified acid solution into bottom-hole zone. Amount of gas-creating agent is selected basing on condition of complete saturation of acid solution with gas-creating agent at bed pressure and temperature. Ratio of bottom-hole pressure in process of injection to bed pressure is maintained at level below 2. In addition, prior to injection of acid solution, added to acid solution is cationic surface-active agent in amount of 0.01-1%. EFFECT: higher efficiency. 1 tbl