METHOD FOR TREATING DOWN-HOLE ZONE OF OIL BED Russian patent published in 1997 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, injected into well is solution of acid and solution of surface-active matter in which used are solutions on accompanying brine water. Before injection of acid solution, bottom-hole of well is filled with 3-15% solution of muriatic acid on accompanying brine water. Technological delay is undertaken until level of muriatic acid is reduced. Level of filling bottom-hole is raised by new portion of muriatic acid solution. Operations of reducing-raising level are repeated. Injected into down-hole zone are acid solution and solution of surface-active matter until well injectivity reaches at least 70% of injectivity of closest injection wells. Injection of solutions is performed in mode of their continuous motion in down-hole zone of well. EFFECT: high efficiency.