Kellogg Brown + Root LLC

David Brian Andersen

John Christian Hartley Mungall

Kevin Gerard Haverty

Shankar Uluvana Bhat

William Lewis Greiner

Davinder Manku

Sean K Barr

The current subject matter relates to compliant variable tension risers to connect deep-water subsea wellheads to a single floating platform in wet tree or dry try systems. The variable tension risers allow several subsea wellheads, in water depths from 1220 to 3050 meters, at lateral offsets from one-tenth to twice the depth or more, to tie back to a single floating platform. Also, the current subject matter relates to methods to counter buoyancy and install variable tension risers using a weighted chain ballast line.

Subsea well communications apparatus and method using variable tension large offset risers

Disclosed are compliant variable tension risers () to connect deep-water subsea wellheads () to a single floating platform (). The variable tension risers () allow several subsea wellheads (), in water depths from 4,000 to 10,000 feet, at lateral offsets from one-tenth to one-half of the depth, to tie back to a single floating dry tree semi-submersible platform ().

Dry tree subsea well communications apparatus using variable tension large offset risers

Disclosed are methods to counter buoyancy and install variable tension risers using a weighted chain ballast line. An example of an apparatus used in conjunction with the embodiments includes compliant variable tension risers to connect deep-water subsea wellheads to a single floating platform. The variable tension risers allow several subsea wellheads, in water depths from 4,000 to 10,000 feet, at lateral offsets from one-tenth to one-half of the depth, to tie back to a single floating dry tree semi-submersible platform.

Dry tree subsea well communications methods using variable tension large offset risers

Disclosed are compliant variable tension risers () to connect deep-water subsea wellheads () to a single floating platform () in wet tree or dry try systems. The variable tension risers () allow several subsea wellheads (), in water depths from 1220 to 3050 meters, at lateral offsets from one-tenth to twice the depth or more, to tie back to a single floating platform (). Also disclosed are methods to counter buoyancy and install variable tension risers using a weighted chain ballast line ().

Disclosed are compliant variable tension risers () to connect deep-water subsea wellheads () to a single floating platform (). The variable tension risers () allow several subsea well-heads (), in water depths from 4,000 to 10,000 feet, at lateral offsets from one-tenth to one-half of the depth, to tie back to a single floating dry tree semi-submersible platform (). Also disclosed are methods to counter buoyancy and install variable tension risers using a weighted chain ballast line ().

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Houston, TX, United States of America

David Brian Andersen