Kellogg Brown + Root LLC

Sean K Barr

John Christian Hartley Mungall

David Brian Andersen

Shankar Uluvana Bhat

Kevin Gerard Haverty

Davinder Manku

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 () 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 ().

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Magnolia, TX, United States of America

Sean K Barr