METHOD FOR WELL CASING Russian patent published in 1996 - IPC

FIELD: well drilling. SUBSTANCE: upon completion of drilling, run into well is casing string which is cemented, secured relative to well walls and its upper part is suspended from wellhead with calculated force. Casing string is secured relative to well walls in two stages:lower part of casing string is secured at the moment of beginning of cement setting, and its upper part is secured in the period after beginning of cement setting, but not later than 2/3 of setting period. Upper part of casing string is suspended during the second period. EFFECT: provided proper sealing of casing string-borehole annulus.