Subsea drilling with casing

摘要

A method of forming a wellbore includes providing a drilling assembly comprising one or more lengths of casing and an axially retracting assembly having a first tubular; a second tubular at least partially disposed in the first tubular and axially fixed thereto; and a support member disposed in the second tubular and movable from a first axial position to a second axial position relative to the second tubular, wherein, in the first axial position, the support member maintains the second tubular axially fixed to the first tubular, and in the second axial position, allows the second tubular to move relative to the first tubular; and an earth removal member disposed below the axially retracting assembly. The method also includes rotating the earth removal member to form the wellbore; moving the support member to the second axial position; and reducing a length of the axially retracting assembly.

主权项

1. A retractable tubular assembly, comprising:
a first tubular; a second tubular at least partially disposed in the first tubular; an engagement member for coupling the first tubular to the second tubular, the engagement member having an engaged position to lock the first tubular to the second tubular and a disengaged position to release the first tubular from the second tubular; and a selectively releasable sleeve support member disposed in the second tubular for maintaining the engagement member in the engaged position, wherein the support member includes a central bore and a channel for establishing fluid communication between the first tubular and the second tubular after moving axially relative to the second tubular to allow the engagement member to move to the disengaged position.