Wells – Processes – Placing or shifting well part
Patent
1986-07-03
1987-09-01
Novosad, Stephen J.
Wells
Processes
Placing or shifting well part
166 85, 166 86, 166 88, 285142, E21B 2300, E21B 3304, F16L 2104
Patent
active
046902210
ABSTRACT:
A well tubing hanger designed for severe service applications includes an annular seal formed about the tubing hanger exterior that is not energized during normal well operations. The annular seal is energized by lowering the tubing hanger downward within the tubing head until the annular seal subsequently contacts in a fluid-tight manner both the tubing hanger and the tubing head. The tubing hanger is lowered relative to the tubing head by rotative disengagement of a treaded mandrel operatively connected between the tubing hanger and the tubing head. The annular seal is energized prior to installation or removal of well flow control equipment located above the tubing hanger and tubing head, preferably after well fluid flow through the well has been secured.
REFERENCES:
patent: 1389920 (1921-09-01), Weaver et al.
patent: 2148327 (1939-02-01), Smith et al.
patent: 2150887 (1939-03-01), Mueller et al.
patent: 2241333 (1941-05-01), Smith
patent: 2277380 (1942-03-01), Yancey
patent: 3001803 (1961-09-01), Watts et al.
patent: 4190270 (1980-02-01), Vanderford
patent: 4327804 (1982-05-01), Reed
Novosad Stephen J.
Shell California Production Inc.
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