Apparatus and method for drilling with casing
First Claim
1. A method of drilling a wellbore with casing, comprising:
- placing a string of casing with a drill bit at the lower end thereof into a previously formed wellbore;
urging the string of casing axially downward to form a new section of wellbore;
pumping fluid through the string of casing into an annulus formed between the casing string and the new section of wellbore; and
diverting a portion of the fluid from the annulus into an upper annulus in the previously formed wellbore.
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Accused Products
Abstract
The present invention generally relates to a method and an apparatus for drilling with casing. In one aspect, a method of drilling a wellbore with casing is provided, including placing a string of casing with a drill bit at the lower end thereof into a previously formed wellbore and urging the string of casing axially downward to form a new section of wellbore. The method further includes pumping fluid through the string of casing into an annulus formed between the casing string and the new section of wellbore. The method also includes diverting a portion of the fluid into an upper annulus in the previously formed wellbore. In another aspect, a method of drilling with casing to form a wellbore is provided. In yet another aspect, an apparatus for forming a wellbore is provided. In still another aspect, a method of casing a wellbore while drilling the wellbore is provided.
413 Citations
31 Claims
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1. A method of drilling a wellbore with casing, comprising:
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placing a string of casing with a drill bit at the lower end thereof into a previously formed wellbore;
urging the string of casing axially downward to form a new section of wellbore;
pumping fluid through the string of casing into an annulus formed between the casing string and the new section of wellbore; and
diverting a portion of the fluid from the annulus into an upper annulus in the previously formed wellbore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of drilling with casing to form a wellbore, comprising:
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placing a casing string with a drill bit at the lower end thereof into a previously formed wellbore;
urging the easing string axially downward to form a new section of wellbore;
pumping fluid through the casing string into an annulus formed between the casing string and the new section of wellbore; and
diverting a portion of the fluid into an upper annulus in the previously formed wellbore from a flow path in a run-in string of tubulars disposed above the casing string. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for forming a wellbore, comprising:
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a casing string with a drill bit disposed at an end thereof; and
a working string coupled to the casing string;
a fluid bypass disposed above the drill bit and operatively connected to the casing string for diverting a portion of fluid flowing towards the drill bit from an interior portion of the working string to an exterior portion of the working string. - View Dependent Claims (26, 27, 28, 29)
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30. An apparatus for forming a wellbore, comprising:
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a casing string with a drill bit disposed at an end thereof; and
a fluid bypass operatively connected to the casing string for diverting a portion of fluid from a first to a second location within the wellbore as the wellbore is formed, wherein the fluid bypass is selectively opened and closed to control the amount of fluid flowing through the fluid bypass.
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31. An apparatus for forming a wellbore, comprising:
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a casing string with a drill bit disposed at an end thereof;
a fluid bypass operatively connected to the casing string for diverting a portion of fluid from a first to a second location within the wellbore as the wellbore is formed;
a flow apparatus disposed in the casing string, wherein the flow apparatus includes one or more ports that may be selectively opened and closed to control the amount of fluid flowing through the flow apparatus.
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Specification