METHOD OF TREATMENT OF WELL BOTTOM-HOLE ZONE Russian patent published in 2003 - IPC

FIELD: oil producing industry; applicable in treatment of well bottom-hole zone. SUBSTANCE: method includes singling-out of oil-bearing interlayer; selective injection into formation oil-bearing interlayer under pressure exceeding formation fracturing pressure of slowly reacting acid solution; forcing of slowly reacting acid solution and pressure drop and acid reaction are waited. With produced oil water cutting in excess of 60%, prior to injection of slowly reacting acid solution, formation water is injected in volume of tubing string cavity. Pure channels formed at fracturing pressure are flushed and coagulation of acid solution is reduced. Products of reaction of acid solution and rock are removed from bottom-hole zone under wellhead pressure. Process is let to stand up for pressure stabilization. EFFECT: higher efficiency of method. 3 cl