Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
First Claim
1. A method for forming a wellbore, comprising:
- providing a drill string having a casing portion;
drilling the wellbore using the drill string;
locating the casing portion within the wellbore;
pumping a one-way valve down the drill string; and
placing a physically alterable bonding material in an annulus formed between the casing portion and the wellbore.
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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.
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Citations
31 Claims
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1. A method for forming a wellbore, comprising:
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providing a drill string having a casing portion; drilling the wellbore using the drill string; locating the casing portion within the wellbore; pumping a one-way valve down the drill string; and placing a physically alterable bonding material in an annulus formed between the casing portion and the wellbore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for forming a wellbore, comprising:
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providing a drill string having a casing portion; drilling the wellbore using the drill string; pumping a valve assembly down the drill string; and locating the valve assembly in the casing portion. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification