METHOD FOR TREATING DOWN-HOLE ZONE OF INJECTION WELL Russian patent published in 1997 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, undertaken is renewal of perforation of up to 10 holes per linear meter of perforation interval. Powder charge is burnt at bottom hole. Acid solution is injected in portions. Injected in first portion is acid solution of high concentration and in small volume, injected in second portion is acid solution of low concentration and in large volume. Pressure of injecting portions is maintained close to value of well casing string testing pressure. Injected is working agent which is used in development, and injection flow rate is 6-10 l/s in injection mode of 2-4 h, injection time 0.12-0.5 h. Technological delay is continued until reaching required injectivity of well with subsequent transfer to agent injection procedure in mode of deposit development operation. EFFECT: high efficiency.