Drilling with concentric strings of casing
First Claim
1. A method for setting at least two strings of casing within a wellbore, the at least two strings of casing comprising a second string of casing disposed within a first string of casing, comprising:
- running a casing working string into the wellbore, the casing working string comprising;
the at least two strings of casing releasably connected to one another; and
a drill bit piece disposed at the lower end of at least one of the at least two strings of casing;
setting the first string of casing within the wellbore;
releasing the releasable connection between the first string of casing and the second string of casing;
running the casing working string into the wellbore to a second depth while applying rotational force to the drill bit piece; and
setting the second string of casing within the wellbore.
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Accused Products
Abstract
The present invention provides a method and apparatus for setting concentric casing strings within a wellbore in one run-in of a casing working string. In one aspect of the invention, the apparatus comprises a drilling system comprising concentric casing strings, with each casing string having a drill bit piece disposed at the lower end thereof. The drill bit pieces of adjacent casing strings are releasably connected to one another. In another aspect of the invention, a method is provided for setting concentric casing strings within a wellbore with the drilling system. In another aspect of the invention, the releasably connected drill bit pieces comprise a drill bit assembly.
511 Citations
36 Claims
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1. A method for setting at least two strings of casing within a wellbore, the at least two strings of casing comprising a second string of casing disposed within a first string of casing, comprising:
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running a casing working string into the wellbore, the casing working string comprising;
the at least two strings of casing releasably connected to one another; and
a drill bit piece disposed at the lower end of at least one of the at least two strings of casing;
setting the first string of casing within the wellbore;
releasing the releasable connection between the first string of casing and the second string of casing;
running the casing working string into the wellbore to a second depth while applying rotational force to the drill bit piece; and
setting the second string of casing within the wellbore. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for setting at least three strings of casing within a wellbore, the at least three strings of casing comprising a second string of casing disposed within a first string of casing and a third string of casing disposed within the second string of casing, comprising:
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running a casing working string into the wellbore while applying rotational force to the casing working string, the casing working string comprising;
the at least three strings of casing; and
drill bit pieces disposed at the lower end of each string of casing, the drill bit pieces releasably connected to each other;
setting the first string of casing within the wellbore;
applying a first force to break the releasable connection between the first string of casing and the second string of casing;
running the casing working string into the wellbore to a second depth while applying rotational force to the casing working string;
setting the second string of casing within the wellbore;
applying a second force to break the releasable connection between the second string of casing and the third string of casing;
running the casing working string into the wellbore to a third depth while applying rotational force to the casing working string; and
setting the third string of casing within the wellbore. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method of drilling with casing comprising:
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forming a first section of wellbore with a first casing string, the first casing string having a bore forming member at a lower end thereof; and
forming a second section of wellbore with a second casing string, the second casing string selectively extending telescopically from the lower end of the first casing string, wherein first section of wellbore has a larger diameter than the second section of wellbore.
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17. A drilling system for setting concentric casing strings within a wellbore, comprising:
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at least three strings of casing concentrically disposed;
a connector releasably connecting each adjacent strings of casing; and
a drill bit piece disposed at the lower end of at least one of the at least three strings of casing, wherein the force required to release the connectors increases as the diameter of the strings of casing decreases.
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18. A drilling system for setting concentric casing strings within a wellbore, comprising:
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at least three strings of casing concentrically disposed;
a connector releasably connecting each adjacent strings of casing; and
a drill bit piece disposed at the lower end of at least one of the at least three strings of casing, wherein the connectors comprises an assembly that can be deactivated from the surface of the wellbore by establishing sufficient pressure within the casing strings.
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19. A drilling system for setting concentric casing strings within a wellbore, comprising:
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at least two strings of casing, wherein the outer diameter of the inner string of casing is smaller than the inner diameter of the outer string of casing;
a drill bit piece disposed at the lower end of at least one of the at least two strings of casing;
a connector which releasably connects adjacent casing strings; and
a wiper disposed between the at least two strings of casing.
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20. A drilling system for setting concentric casing strings within a wellbore, comprising:
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at least two strings of casing, wherein the outer diameter of the inner string of casing is smaller than the inner diameter of the outer string of casing;
a drill bit piece disposed at the lower end of at least one of the at least two strings of casing;
a connector which releasably connects adjacent casing strings; and
a torque key system, wherein the torque key system prevents rotational translation of the at least two strings of casing relative to one another.
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21. A drilling system for setting concentric casing strings within a wellbore, comprising:
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at least two strings of casing, wherein the outer diameter of the inner string of casing is smaller than the inner diameter of the outer string of casing;
a drill bit piece disposed at the lower end of at least one of the at least two strings of casing;
a connector which releasably connects adjacent casing strings; and
a spline assembly, wherein the spline assembly prevents rotational translation of the at least two strings of casing relative to one another.
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22. A drilling system for setting concentric casing strings within a wellbore, comprising:
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an inner string of casing concentrically disposed within an outer string of casing;
a connector for releasably connecting the inner string to the outer string;
a first drilling member connected to the inner string; and
a circumferential drilling member connected to the outer string, wherein the drilling members are separable when the inner string is released from the outer string. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification