METHOD FOR CUTTING SIDE BORE-HOLE IN ENCASED WELL

摘要

FIELD: bore-hole drilling machinery and equipment. SUBSTANCE: this is intended mainly for restoring idle wells. According to method, lowered into well is cutting device which cuts out required section of casing string in predetermined zone. Operations include cutting off casing string in aforesaid zone, lifting cut-off casing string, cementation, arrangement of cement bridge in open part of well, and starting drilling in of side bore-hole from cement bridge. Cut-off part of casing string can be removed from well for repeated use. EFFECT: higher efficiency. 1 cly