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

FIELD: oil and gas production industry. SUBSTANCE: this can be used in treating bottom-hole zones of wells by blocking-off water-permeable interlayers. According to method, before injecting water solution of surface-active substance, solution is aerated. Aeration is performed at ratio of 3.1 to 4.4 at bed conditions. Injection of solution into bottom-hole of well is effected in cyclic manner, that is injection of solution is alternated with injection of non-aerated liquid under pressure which is not below difference between values of 1.3 of bed pressure and hydrostatic pressure of aerated solution in amount needed for filling not less than 1 m of bottom-hole zone of receiving bed interval. EFFECT: higher efficiency. 3 ex