LINER HANGER, RUNNING AND SETTING TOOL

A delayed action hydraulic well liner hanger and running tool for running, setting, and anchoring a string of tubular well bore liner within a well casing as in an oil and gas well including a liner hanger device having expandible slips for anchoring the device in a well casing, slip expanders for expanding the slips, an annular seal element for sealing around the device with the inner wall of the casing, locking slips for holding the casing anchor slips at locked positions and locking slips for holding the annular seal expanded against the casing wall and a running tool for running, setting and anchoring the liner device including a hydraulic piston assembly having a piston operated coupling connectible by shear pin means with an outer sleeve portion of the liner hanger device, a coupling assembly having a threaded nut and a load bearing thrust plate connectible with an inner sleeve portion of the liner hanger device and an expandible dog assembly for engaging the upper end of the outer sleeve portion of the liner hanger device. The liner hanger device is run into a well bore with the running tool connected through the threaded nut with the inner sleeve portion of the hanger device and the hydraulic piston assembly shear pinned with the outer sleeve of the hanger device. Hydraulic fluid pressure communicated to the hydraulic piston assembly first sets the liner slips against the well casing and severs the shear pin connection between the running tool and the liner hanger. The running tool is then lifted and lowered in the liner hanger engaging the running tool dog assembly with the liner hanger expanding and setting the annular seal.