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

FIELD: oil production industry. SUBSTANCE: according to method, injected into bottom-hole zone of well is plugging material which is resistant to acid action, also injected is acid solution. Plugging material is injected under higher injection pressure. Acid solution is injected at lower injection pressure. Initial pressure of injecting subsequent solution is taken as being equal to final pressure of injecting previous solution. Plugging material is injected in larger amount than acid solution. On completion of injecting solutions technological delay is undertaken. Injection of plugging material and acid solution is carried out in cyclic procedure. Application of aforesaid method leads to reduced watering of product. EFFECT: higher efficiency. 3 cl