SUBSEA DRILLING WITH CASING

WIPO Patent Application WO/2010/057221

A3

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.

TREVINO JOSE A (US)
ODELL II ALBERT C (US)
TWARDOWSKI ERIC M (US)
LE TUONG THANH (US)
XU WEI JAKE (US)
FEASEY GUY F (GB)

PCT/US2009/064875

November 11, 2010

November 17, 2009

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WEATHERFORD LAMB (US)
TREVINO JOSE A (US)
ODELL II ALBERT C (US)
TWARDOWSKI ERIC M (US)
LE TUONG THANH (US)
XU WEI JAKE (US)
FEASEY GUY F (GB)

E21B7/20; E21B7/06; E21B17/07

WO2007091054A1

2007-08-16

US4423889A	1984-01-03
US6003607A	1999-12-21
US20040221997A1	2004-11-11

PATTERSON, William B. et al. (LLP3040 Post Oak Blvd., Suite 150, Houston Texas, US)

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