Holddown mechanism for a tubing hanger in a wellhead
A wellhead assembly comprises: a head member adapted to support at least one well casing, said head member haivng an axial bore and a plurality of spaced apart threaded passages extending generally horizontally from the outer surface of said head member to the bore thereof; a hanger bowl supported in the bore of said head member and having a plurality of generally horizontal passages axially aligned with the respective passages of said head member, the passages of said hanger bowl extending from the outside surface of the bowl to a bore thereof; a tubing hanger supported in the bore of said hanger bowl and adapted to receive at least one tubing string extending within the well casing, said tubing hanger having a groove on the outside surface thereof adjacent the inner ends of the passages in said hanger bowl, said groove presenting a camming surface located adjacent the inner ends of the passages in said hanger bowl, said camming surface being inclined from vertical and having an orientation to face generally upwardly and outwardly; a plurality of pins received in the respective passages of said hanger bowl for axial movement therien, each pin having an outer end and an inner end providing a tapered tip extending at least partially into said groove and acting against said camming surface in camming interaction therewith to urge said tubing hanger downwardly in camming fashion; a plurality of screw elements receivied in the respective passages of said head member for threaded axial movement therein, said screw elements being axially aligned with the respective pins and being accessible from the exterior of said head member to effect threaded advancement of the screw elements into the head member and against the outer ends of said pins to force said tapered tips of the pins at least partially into said groove and against said camming surface to hold down said tubing hanger.
- Assignee:
- W K M Wellhead Systems Inc
- Patent Number(s):
- US 4214778
- OSTI ID:
- 6934094
- Resource Relation:
- Patent File Date: Filed date 11 Jan 1979
- Country of Publication:
- United States
- Language:
- English
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