Coiled tubing cutting modification

Details Coiled tubing cutting modification Coiled tubing cutting modification

1992-08-19

1994-02-08

Bui, Thuy M.

Wells

Processes

Assembling well part

166 551, 166336, E21B 2900

Patent

active

052842096

ABSTRACT:
A subsea test tree having a spherical ball valve member is modified to accommodate cutting of a string of coiled tubing extending through the ball valve member. This is accomplished by providing an eccentric recess in an inner bore of the subsea test tree, with the eccentric recess being positioned to receive a lower portion of the coiled tubing string as the coiled tubing string is cut by the ball valve member. This reduces the plastic deformation of the lower portion of the coiled tubing string as the coiled tubing string is cut by the closing ball valve member, and thus reduces the closing force necessary to reliably cut a coiled tubing string when the spherical ball valve member of the subsea test tree is closed in an emergency situation.

REFERENCES:
patent: Re27464 (1972-08-01), Taylor, Jr.
patent: 3411576 (1968-11-01), Taylor, Jr.
patent: 4009753 (1977-03-01), McGill et al.
patent: 4160478 (1979-07-01), Calhoun et al.
patent: 4494609 (1985-01-01), Schwendemann
patent: 4522370 (1985-06-01), Noack et al.
patent: 4658904 (1987-04-01), Doremus et al.
patent: 5050839 (1991-09-01), Dickson et al.

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