Lockdown ring assembly for wellhead seal

Details Lockdown ring assembly for wellhead seal Lockdown ring assembly for wellhead seal

1987-01-15

1988-01-12

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277120, 277193, 277198, F16J 1518, F16J 1524

Patent

active

047186798

ABSTRACT:
A lockdown loading ring mechanism for a dual crossover seal in a pressurized wellhead which comprises a segmented loading ring assembly 60 of a plurality of arcuate segments 60a arranged in circular fashion within the wellhead annulus between the dual sealing devices of a dual crossover seal assembly 40. The ends of adjacent segments are spaced to allow for contraction and expansion of the assembly. Each segment is actuated by at least one holddown screw 66 of a plurality of holddown screws disposed in radial array about the wellhead axis in equiangular spacing and an equal number of holddown screws are employed to actuate each segment. The nose ends 70 of the holddown screws are in abutting engagement with the outer surfaces 63 of the ring segments whereby actuation of the holddown screws drives the ring segments radially inward to where upward and downward facing frustoconical annular surfaces 62, 61 of the loading ring segments engage cooperative camming surfaces 83a, 51a of the energizer rings 83, 51 of the upper and lower sealing devices respectively, and simultaneously apply balanced axially compressive forces to the dual sealing devices to effect their energization and sealing of the wellhead annulus.

REFERENCES:
patent: 1973809 (1934-09-01), Heggem
patent: 2456081 (1948-12-01), Penick
patent: 4349205 (1982-09-01), McGee et al.
patent: 4384726 (1983-05-01), Meyer
patent: 4556224 (1985-12-01), Le

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