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 injection of grouting material resistant to acid and acid solution. Grouting material is injected in volume larger than that of acid solution. Mixture is allowed to stand for curing. Cement mortar is injected to producing interval. Grouting material and acid solution are injected by cycles. Curing is conducted under pressure at wellhead of 7-11 MPa. Just after injection of cement mortar to producing interval, excessive cement mortar is washed out by flushing fluid supplied to annular space in amount of 2-4 volumes of tubing string cavity. EFFECT: higher efficiency of treatment of well bottom-hole zone. 1 ex