Bellows type adjustable casing

摘要

A subsea assembly for producing fluids from a well having a casing string in the well supported with a hanger on an upper end. Cement is in a portion of an annulus between the casing string and walls of the well, thereby leaving segment of the casing string unsupported in the well. A motion compensating element is coaxially provided in the unsupported segment of the casing string to absorb axial expansion and/or contraction that may occur in the unsupported segment of the casing string.

主权项

1. A subsea assembly for carrying fluids from a subsea wellbore comprising:
an outer tubular inserted in an opening of the wellbore; a hanger mounted on a lower end of the outer tubular; a casing string depending from the hanger into the wellbore; and an axially expandable and compensating member provided along a portion of the casing string having a wall with undulations that comprise a series of slots along a length of the wall alternatingly formed about an inner circumference and about an outer circumference of the wall, each slot lying in a plane substantially perpendicular to an axis of the compensating member, the slots defining a series of cantilevers along a length of the body that are bendable when the body is axially compressed and that are bendable when the body is axially elongated, so that when casing above the compensating member is supported in tension the body transmits the tension to the casing below the compensating member.