Importance

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Abstract

A running tool (RT) comprising a stem (10) with a torque ring (44), a running nut (36), an engagement sleeve (40), and a lock ring (42) to releasably connect and support a casing hanger (C), a two piece (16,20) wear bushing (WB) and packoff assembly (P) thereon. The lock ring (42) is wedged into engagement with one piece (16) of the wear bushing (WB) by downward axial movement of the running nut (36). The casing hanger (C) is threaded on the packoff assembly (P) and supported thereby and arranged so that rotation of the torque ring (44) and stem (10) rotates another piece (20) of the wear bushing (24) and the packoff assembly (P) to set the packoff. The casing hanger (C) and one piece of the wear bushing (WB) are lowered on the running tool (RT) into final position within the wellhead (W). The running tool (RT) is released by rotation of the stem (10) which raises the running nut (36), disengages the engagement sleeve (40), allowing the lock ring (44) to disengage the wear bushing (WB). A dead band between the engagement sleeve (40) and running nut (36) prevents accidental release of the running tool (RT) from the wear bushing (WB), and, on further rotation, the running nut (36) becomes a driving element for piece (20) of the wear bushing (WB) and for threading packoff drive nut (32) of the packoff assembly (P) so as to set the packoff. During rotation, the packoff nut (32) becomes disengaged from piece (16) of the wear bushing (WB). The apparatus is characterized by not having the lock ring (42) engage the casing hanger (C) and in that one running tool is usable with several sizes of casing hangers.

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First Claim