Apparatus and method of drilling with casing
First Claim
1. A method of drilling a subsea wellbore with casing, comprising:
- placing a string of casing with a drill bit at the lower end thereof in a riser system;
urging the string of casing axially downward; and
reducing the axial length of the string of casing through telescopic movement between a larger diameter portion and a smaller diameter portion of the string of casing to land a wellbore component in a subsea wellhead.
9 Assignments
0 Petitions
Accused Products
Abstract
The present invention generally relates to methods for drilling a subsea wellbore and landing a casing mandrel in a subsea wellhead. In one aspect, a method of drilling a subsea wellbore with casing is provided. The method includes placing a string of casing with a drill bit at the lower end thereof in a riser system and urging the string of casing axially downward. The method further includes reducing the axial length of the string of casing to land a wellbore component in a subsea wellhead. In this manner, the wellbore is formed and lined with the string of casing in a single run. In another aspect, a method of forming and lining a subsea wellbore is provided. In yet another aspect, a method of landing a casing mandrel in a casing hanger disposed in a subsea wellhead is provided.
-
Citations
40 Claims
-
1. A method of drilling a subsea wellbore with casing, comprising:
-
placing a string of casing with a drill bit at the lower end thereof in a riser system;
urging the string of casing axially downward; and
reducing the axial length of the string of casing through telescopic movement between a larger diameter portion and a smaller diameter portion of the string of casing to land a wellbore component in a subsea wellhead. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A method of forming and lining a subsea wellbore, comprising:
-
disposing a run-in string with a casing string at the lower end thereof in a riser system, the casing string having a casing mandrel disposed at an upper end thereof and a collapsible apparatus and a drill bit disposed at a lower end thereof;
rotating the casing string while urging the casing string axially downward to a predetermined depth, whereby the casing mandrel is a predetermined height above a casing hanger; and
reducing the length of the casing string thereby seating the casing mandrel in the casing hanger. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
-
-
32. A method of landing a casing mandrel in a casing hanger disposed in a subsea wellhead, comprising:
-
placing a casing string with the casing mandrel disposed at the upper end thereof into a riser system;
drilling the casing string into the subsea wellhead to form a wellbore;
positioning the casing mandrel at a predetermined height above the casing hanger; and
reducing the axial length of the casing string through sliding movement between a larger diameter portion and a smaller diameter portion of the string of casing to seat the casing mandrel in the casing hanger. - View Dependent Claims (33, 34, 35, 36)
-
-
37. A method of drilling with casing, comprising:
-
providing a string of casing with a drill bit at the lower end thereof;
rotating the string of casing while urging the string of casing axially downward; and
reducing the axial length of the string of casing through axial movement between a first portion and a second portion of the string of casing to land a wellbore component in a wellhead, wherein the second portion has a smaller diameter than the first portion.
-
-
38. A method of drilling a subsea wellbore with casing, comprising:
-
placing a string of casing with a drill bit at the lower end thereof in a riser system;
rotating the string of casing while urging the string of casing axially downward;
reducing the axial length of the string of casing through movement between a first and a second section of the string of casing to land a wellbore component in a wellhead, wherein the second section has a larger diameter than the first section.
-
-
39. A method of drilling a subsea wellbore with casing, comprising:
-
placing a string of casing with a drill bit at the lower end thereof in a riser system;
urging the string of casing axially downward; and
reducing the axial length of the string of casing to land a wellbore component in a subsea wellhead by permitting a weight of the string of casing to compress a portion of the string of casing to reduce the axial length thereof.
-
-
40. A method of landing a casing mandrel in a casing hanger disposed in a subsea wellhead, comprising;
-
placing a casing string with the casing mandrel disposed at the upper end thereof into a riser system;
drilling the casing string into the subsea wellhead to form a wellbore;
positioning the casing mandrel at a predetermined height above the casing hanger; and
reducing the axial length of the casing string to seat the casing mandrel in the casing hanger by permitting a weight of the casing string to compress a portion of the casing string to reduce the axial length thereof.
-
Specification