Casing hanger running tool
US4674576A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Aug 16, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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) be…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.