Sub-sea test tree apparatus

Details Sub-sea test tree apparatus Sub-sea test tree apparatus

1995-02-10

1999-01-19

Schoeppel, Roger J.

Wells

Submerged well

Means removably connected to permanent well structure

166358, 166363, 175318, 175423, 277 3, 251 11, E21B 3306

Patent

active

058604782

ABSTRACT:
Apparatus and a method for killing a live well after activation of a well blowout preventer is described. This is achieved by providing apparatus in the form of a shear or kill sleeve (34) in a string (26) above a sub-sea test tree and which is located between the pipe rams (22, 24) and shear rams (18) of a blowout preventer (12). In the event that the shear rams (18) are activated and seal the string above the kill sleeve (34), the sleeve includes a pressure sensitive valve (84) which may be opened, by pressurising between the blowout preventer rams (18, 22), to permit fluid to be pumped from the blowout preventer (12) through the valve (84) and into the string (40), to choke or kill the well. After the well has been killed, the blowout preventer (12) may be opened to permit removal of the well tools. Embodiments of the invention are described.

REFERENCES:
patent: 3695349 (1972-10-01), Murman et al.
patent: 3955623 (1976-05-01), Aumann
patent: 4116272 (1978-09-01), Barrington
patent: 4159637 (1979-07-01), Lamb et al.
patent: 4375239 (1983-03-01), Barrington et al.
patent: 4378849 (1983-04-01), Wilks
patent: 4436157 (1984-03-01), Brooks
patent: 4553591 (1985-11-01), Mitchell
patent: 4880060 (1989-11-01), Schwendemann et al.
patent: 4938290 (1990-07-01), Leggeit et al.

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