Holddown mechanism for a tubing hanger in a wellhead

Details Holddown mechanism for a tubing hanger in a wellhead Holddown mechanism for a tubing hanger in a wellhead

1979-01-11

1980-07-29

Arola, Dave W.

Pipe joints or couplings

With assembly means or feature

Particular tool-engaging means or with tool

166 89, 285143, 285137A, 285404, F16L 3500

Patent

active

042147786

ABSTRACT:
A mechanism for releasably holding down a tubing hanger received within a hanger bowl of a wellhead. Pins mounted for axial sliding movement in horizontal passages of the hanger bowl are forced inwardly by screws which are threaded into passages of the wellhead and against heads formed on the outer ends of the pins. The pins have tapered inner ends which are forced into a groove of the tubing hanger and against a camming surface of the groove in order to press the tubing hanger downwardly within the hanger bowl. Each screw has a blade on its inner end which enters a slot in the head of the corresponding pin to rotate the pin as it is pushed against the camming surface of the groove. Springs urge the pins outwardly to facilitate entry of the blades into the slots, and retainer rings maintain the pins in their passages in the hanger bowl.

REFERENCES:
patent: 1008424 (1911-11-01), McKinney et al.
patent: 1965907 (1934-07-01), Pierce
patent: 1978991 (1934-10-01), Dailey et al.
patent: 3151892 (1964-10-01), Word et al.
patent: 3489439 (1970-01-01), Word
patent: 3606393 (1971-09-01), Huntsinger et al.
patent: 3821984 (1974-07-01), Lee
patent: 3863959 (1975-02-01), Blaschke

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