Wellhead equipment
Wellhead equipment is described comprising: a casing head connectible to an outermost casing string and having a bore therethrough, a casing hanger lowerable through and landable within the bore of the head and connectible to an outer casing string for suspending it within the outermost string, a seal assembly, and a running tool including: a mandrel connectible to a drill pipe for raising and lowering therewith, a first sleeve supported by the mandrel for vertical movement with respect thereto and supported on and sealably engaged with the hanger, means holding the first sleeve against rotation with respect to the hanger when supported thereon, a tubular body carried by the mandrel for rotation therewith and releasably connected to the seal assembly for lowering the seal assembly with the mandrel, a second sleeve, means connecting the first sleeve to the hanger, when the second sleeve is in the first position, and releasing the first sleeve from the hanger when the second sleeve is moved toward its second position, and means for locking the seal assembly against vertical movement to permit the running tool to be raised from the seal assembly and hanger upon release of the seal assembly from connection to the tubular body.
- Assignee:
- Dril-Quip, Inc., Houston, TX
- Patent Number(s):
- US 4757860
- OSTI ID:
- 6986568
- Country of Publication:
- United States
- Language:
- English
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