Method and apparatus for preventing vertical movement of subsea

Details Method and apparatus for preventing vertical movement of subsea Method and apparatus for preventing vertical movement of subsea

1982-02-01

1984-08-21

Pate, III, William F.

Wells

Submerged well

Connection or disconnection of submerged members remotely...

166348, 166367, 175 7, 175321, E21B 1701

Patent

active

044664877

ABSTRACT:
A method and apparatus is disclosed for eliminating vertical motion of a downhole tool in a subsea borehole as the tool is being operated by a drill string from a floating vessel. A vertical motion elimination means is incorporated into the drill string at a point which will be adjacent a blowout preventer stack on the marine bottom when the downhole tool is positioned at a desired point in the borehole. The vertical motion elimination means is comprised of a sleeve which is rotatably mounted on the drill string at a fixed vertical position. The sleeve is adapted to be engaged by the blowout preventer stack to fix the sleeve against vertical movement with respect to the preventer. Since the sleeve, itself, is fixed against vertical movement on the drill string, that portion of the drill string which lies below the preventer (hence, the downhole tool) will also be fixed against vertical motion within the borehole. However, since the drill string is rotatable with respect to the sleeve, the drill string can be rotated while the sleeve is engaged. A plurality of ports are provided in the sleeve to allow fluid circulation through the drill string while the sleeve is engaged by the blowout preventer stack.

REFERENCES:
patent: 3301324 (1967-01-01), Smith
patent: 3329221 (1967-07-01), Walker
patent: 3517739 (1970-06-01), Rowley
patent: 3587734 (1971-06-01), Shaffer
Composite Catalog of Oilfied Equipment, p. 2020, 1982-83 Edition.

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