Deep water drilling with casing

A method for lining a portion of a wellbore, comprising:

• rotating a casing assembly into the wellbore while forming the wellbore, the casing assembly comprising an outer casing portion and an inner casing portion wherein the outer and inner casing portions are operatively connected;
• disabling a connection between the inner casing portion and the outer casing portion;
• and
• lowering the inner casing portion relative to the first casing portion.

An apparatus for lining a wellbore, comprising:

• a casing;
• a drilling member disposed at a lower end of the casing;
• a conveying member having a diameter less than the casing;
• and
• a tubular adapter for coupling the conveying member to the casing.

A method of lining a wellbore, comprising:

• positioning a first casing in the wellbore;
• providing a drilling assembly having a second casing and a drilling member;
• forming a wellbore using the drilling assembly;
• connecting a conveying member having a diameter less than the second casing to the second casing, wherein a tubular adapter is used to couple the conveying member to the second casing;
• providing a casing hanger on the second casing;
• and
• coupling the second casing to the first casing.