Wells – Processes – Placing or shifting well part
Patent
1990-05-04
1991-03-19
Dang, Hoang C.
Wells
Processes
Placing or shifting well part
166136, 166182, 166208, E21B 3304, E21B 2300
Patent
active
050002660
ABSTRACT:
An improved wellhead annulus seal installation tool and preload retention apparatus is disclosed particularly adapted for metal-to-metal seals. The seal installation tool includes a telescoping mandrel with a torsion spring attached and a torque sleeve rotatably mounted thereon with a pair of antirotation pins for limiting the rotation of the torque sleeve, a resilient seal for sealing the lower portion of the tool inside the hanger and torque pins for transmitting the torque and axial movement of the tool to the preload retention apparatus. The preload retention apparatus includes an upper body with an annulus packoff seal which may be resilient or metal-to-metal and a driving ring threaded thereon. An expansible lock ring in carried on the driving ring with an expander ring thereabove which coacts with the seal installation tool to thereby lock the annulus packoff seal inside the wellhead.
REFERENCES:
patent: 2998072 (1961-08-01), Crowe
patent: 3350130 (1967-10-01), Ahlstone et al.
patent: 3357486 (1967-12-01), Brown
patent: 3543847 (1970-12-01), Haeber
patent: 3871449 (1975-03-01), Ahlstone
patent: 3897823 (1975-08-01), Ahlstone
patent: 4003434 (1977-01-01), Garrett et al.
patent: 4019580 (1977-04-01), Garrett
patent: 4597448 (1986-07-01), Bangl
Saunders Brian
Smith Jerry D.
Cooper Industries Inc.
Dang Hoang C.
Duke Jackie Lee
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