METHOD OF TREATMENT OF BOTTOMHOLE ZONE OF WELL IN MULTILAYER OIL POOL Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in shutoff of water inflows to producing wells. SUBSTANCE: method includes injection into oil formation of acid solution, injection into water-encroached formation of solution of acid and acid proof plugging material and communication of formations in well. First, acidproof plugging material and acid solution are injected cycle, acidproof plugging material is the first to be injected with single injection of acidproof plugging material in the last cycle. Volume of injected acid solution into oil formation is not in excess of volume of injected acidproof plugging material into water-encroached formation. EFFECT: higher efficiency of bottomhole zone treatment due to shutoff of water-encroached formation. 1 ex