Storm valve

Details Storm valve Storm valve

1998-09-24

2001-02-06

Schoeppel, Roger (Department: 3672)

Wells

Submerged well

Connection or disconnection of submerged members remotely...

C166S340000, C166S348000, C166S356000, C166S358000, C166S363000, C166S364000, C166S365000, C166S373000, C166S330000, C166S332200, C166S332400, C166S334400, C166S382000, C166S387000

Reexamination Certificate

active

06182762

ABSTRACT:

TECHNICAL FIELD
This invention is related in general to offshore well drilling, and in particular to a storm valve that closes a passage of a string of drill pipe, allowing the drill pipe to be stored within a cased portion of a well during a storm.
BACKGROUND ART
In offshore drilling, if a severe storm alert occurs, it may be necessary to evacuate the platform. If a well is being drilled, it is preferable to store the string of drill pipe within the cased portion of the hole, rather than pulling the string to the surface and leaving it on the drilling rig. In doing so, the drill string must be pulled up sufficiently high so that it is fully contained within the cased portion of the well. A packer will be set in the annulus surrounding the drill pipe. A valve in the drill string closes the passage. The packer has a hanger mechanism that supports the weight of the drill string in the well. The portion of the drill string above the valve is retrieved.
While this technique is workable, the valve must be open while the drill string is run into the well, then closed. Closing the valve in the drill string can be a problem, particularly with floating drilling vessels.


REFERENCES:
patent: 4372391 (1983-02-01), Barrington et al.
patent: 4372392 (1983-02-01), Barrington et al.

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