Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
DCFirst Claim
1. A method of drilling a wellbore, comprising:
- providing a casing string having;
a drilling assembly disposed at a lower end of the casing string; and
an annular recess profile formed in an inner surface of the casing string, wherein the annular recess profile is located above the drilling assembly, drilling the wellbore using the casing string and the drilling assembly;
engaging a one-way valve to the annular recess profile; and
pumping cement through the casing string and the one-way valve.
3 Assignments
Litigations
0 Petitions
Reexamination
Accused Products
Abstract
The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Methods of operation are described that provide for the efficient installation a cemented steel cased well wherein the drill string and the drill bit are cemented into place during one single drilling pass down into the earth. The normal mud passages or watercourses present in the rotary drill bit are used for the second independent purpose of passing cement into the annulus between the casing and the well while cementing the drill string into place during one single pass into the earth. A one-way cement valve is installed near the drill bit of the drill string that allows the cement to set up efficiently under ambiently hydrostatic conditions while the drill string and drill bit are cemented into place during one single drilling pass into the earth.
-
Citations
31 Claims
-
1. A method of drilling a wellbore, comprising:
-
providing a casing string having; a drilling assembly disposed at a lower end of the casing string; and an annular recess profile formed in an inner surface of the casing string, wherein the annular recess profile is located above the drilling assembly, drilling the wellbore using the casing string and the drilling assembly; engaging a one-way valve to the annular recess profile; and pumping cement through the casing string and the one-way valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A drill string for drilling a wellbore, comprising:
-
a casing string having a bore; a drilling assembly coupled to a lower end of the casing string; and a recess profile formed in a surface of the bore; and a one-way valve adapted to engage the recess profile. - View Dependent Claims (18, 19, 20, 21)
-
-
22. A cement valve assembly for use with a drill string, comprising:
-
a tubular body connectable to the drill string, wherein the tubular body includes a bore extending therethrough; a recess profile formed in a surface of the bore; and a cement valve adapted to engage the recess profile. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification