METHOD OF WELL COMPLETION Russian patent published in 1999 - IPC

FIELD: mining industry; applicable in completion of oil and gas wells. SUBSTANCE: method includes jig drilling, lowering and cementing of intermediate casing string, primary opening of producing formation, lowering and cementing of casing liner, lowering of fluid level in well and secondary opening of producing formation. In this case, jig drilling and lowering of intermediate casing string are carried out down to roof of producing formation. Cementing of intermediate casing string is effected to wellhead. As a result, intermediate casing string overlaps high-pressure water-showing beds. primary opening, liner cementing and secondary opening are carried out at equalizing conditions, or at negative differential pressure. EFFECT: higher quality of opening of producing deposits by reduction of value of repressing in performance of process operations in well completion. 1 cl