Casing hanger wear bushing
This patent describes improvement in a subsea well of the type having a wellhead housing which supports a casing hanger secured to the upper end of a string of casing, the casing hanger having an axial bore and being surrounded by an annulus for receiving a seal between the casing hanger and the wellhead housing. The improvement comprises a wear bushing; an annular profile formed in the bore of the casing hanger; means for securing the wear bushing to the annular profile for releasably mounting the wear bushing within the bore of the casing hanger; means for releasably securing the wear bushing to a running tool for lowering the wear bushing and casing hanger into the wellhead housing; a ring mounted to the exterior of the wear bushing for axial movement relative to the wear bushing, the ring having a lower end; means for releasably securing the seal to the lower end of the ring; and means for securing the running tool to the ring for moving the ring axially downward after the casing hanger lands in the wellhead, for setting the seal. This patent also describes a method of mounting a casing hanger within a subsea well of the type having a wellhead housing, the casing hanger having an axial bore and being surrounded by an annulus for receiving a seal between the casing hanger and the wellhead housing.
- Assignee:
- Vetco Gray, Inc., Houston, TX (United States)
- Patent Number(s):
- A; US 5025864
- Application Number:
- PPN: US 7-500146
- OSTI ID:
- 5797110
- Country of Publication:
- United States
- Language:
- English
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