METHOD OF CASING LINER INSTALLATION IN WELL Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry, particularly, methods of suspension of casing strings in casing of oil and gas wells, both vertical and inclined. SUBSTANCE: casing liner with hanger in its upper part is run into well and installed on hanger in uncased borehole below shoe of previous casing string; and undoing and lifting of drill pipes are performed directly after injection of cement slurry to casing string-wellbore annulus and washing of wellbore from cement in upper part of liner. The method provides for considerable simplification of lining of well by liner and fully excludes possibility of sticking of drill pipes during injection of cement slurry, especially in side wellbores of inclined wells. EFFECT: higher efficiency and quality of well lining, simplified technology in operations involved in used of suspending devices. 1 dwg