Test tree closure device for a cased subsea oil well

Details Test tree closure device for a cased subsea oil well Test tree closure device for a cased subsea oil well

1995-11-09

1998-06-30

Bagnell, David J.

Wells

Submerged well

Testing

166363, 166322, E21B 712, E21B 3404

Patent

active

057719748

ABSTRACT:
In an offshore oil installation, the closure device (40) of a subsurface test tree placed in the blowout preventer stack on the seabed is made in a modular manner. More precisely, the closure device comprises a plurality of lengths (54,56') suitable for being placed in arbitrary order between a top element (50) and a bottom element (52). This arrangement makes it possible to place the connector (46) between the total shutoff valves (26) and the partial shutoff valves (28) of the blowout preventer stack, and to place the valves (42,44) of the closure device (40) in a closure length (54) that is situated beneath the partial shutoff valves (28). The two total shutoff valves (26) can thus be actuated regardless of the type of blowout preventer stack that is used.

REFERENCES:
patent: 4234043 (1980-11-01), Roberts
patent: 4320804 (1982-03-01), Brooks
patent: 4436157 (1984-03-01), Brooks
patent: 4494609 (1985-01-01), Schwendemann
patent: 4658904 (1987-04-01), Doremus et al.
patent: 4685521 (1987-08-01), Raulins
patent: 4732214 (1988-03-01), Yates
patent: 4880060 (1989-11-01), Schwendemann et al.

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