Patent ID: 9567818
Date: 2017-02-14
CPC Classifications: E21B

Claim:
1. A method of drilling and lining a wellbore, comprising: providing a liner hanger, the liner hanger being secured in use on a liner, operable selectively to be set and unset, and adapted to support the liner within an existing casing when set and to release the liner from the casing when unset; providing a liner hanger setting tool, the liner hanger setting tool being secured in use on a drill string, actuatable selectively to mechanically set and unset the liner hanger, operable selectively to be activated and deactivated, and adapted to attach to the liner and/or liner hanger when activated, to support the liner, and to release from the liner and/or liner hanger when deactivated; and further comprising: (a) setting the liner hanger by actuating the liner hanger setting tool, wherein actuating the liner hanger setting tool for setting the liner hanger comprises rotating a part of the liner hanger setting tool in a first direction; (b) deactivating the liner hanger setting tool; (c) extending the borehole using the drill string while the liner hanger is set; (d) returning the drill string to its position at the setting step or the deactivating step; (e) activating the liner hanger setting tool; (f) unsetting the liner hanger by actuating the liner hanger setting tool, wherein actuating the liner hanger setting tool for unsetting the liner hanger comprises rotating said part of the liner hanger setting tool in a second direction, the second direction being opposite to the first direction; and (g) lowering the liner down the extended borehole on the drill string.