METHOD FOR TREATING BOTTOM-HOLE ZONE OF BED Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: this method particularly concerns treatment of bottom-hole zone of salted beds. According to method, injected into bottom-hole zone is fresh water containing hard salt of sodium chloride. Injected initially in volume of bottom-hole zone is water and it is left in quiescent state for period of dissolving salt. After that, well is set for self-outflow. At initial low degree of filling porous space with salt, injection of water is carried out until content of sodium chloride in outflowing water is not over 1%. Then, bottom-hole zone is subjected to acid treatment. Outflow water is utilized by directing it into water line of injection well. Application of aforesaid method allows for excluding treatments by muriatic acid or just allows for enhancing their efficiency. EFFECT: higher efficiency. 2 cl, 1 tbl