Abstract: A tool for running in a liner hanger and a depending lining string comprises a tubular body having telescopically related inner and outer tubular units which are shearably interconnected for co-rotation. A plurality of downwardly projecting tongues are provided on the periphery of the outer tubular unit and respectively engage upwardly facing grooves provided in the liner hanger to impart rotation in either direction to the liner hanger. A downwardly extending mandrel secured to the inner tubular unit extends through the outer tubular unit and provides a mounting for the ring portion of a collet. The collet has spring biased arms mounting head portions which respectively engage in an annular groove provided in the liner hanger to secure the running tool to the liner hanger for run-in purposes. The collet is normally released from the running tool by a fluid pressure actuated piston mounted on the mandrel.

Abstract: An improved setting tool is provided for positioning, setting, and releasing a liner in a subterranean wellbore. The setting tool includes a plurality of fingers, each biased for locking engagement with axially spaced recesses provided in the wall of the tool mandrel axially above a lowermost position of the liner hanger connecting nut. The fingers are automatically forced upward into a release position when interference rollers move radially out of their respective recesses and separate a plurality of axially movable sleeves. Premature release of the liner is avoided by positioning the recesses in the mandrel such that the fingers are in a lock position when the tool string is either in tension or compression. The liner can be rotated after setting the liner hanger, so that the setting tool and drill string can thereafter be reliably retrieved by simple axial pick-up.