Drillable plug
First Claim
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1. A drillable plug, comprising:
- a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point having a transition shoulder separating an upper outer surface having a circular mandrel profile from a lower outer surface having a non-circular mandrel profile, the lower outer surface extending the length of the lower axial section from the geometry transition point to a bottom end of the mandrel;
a seal element disposed around the upper outer surface;
a lower cone having an inner surface forming a passage, the lower cone disposed around the lower outer surface of the mandrel, wherein the inner surface is configured to mate with the lower outer surface of the mandrel, whereby the lower cone is rotationally locked with the mandrel; and
a lower slip assembly moveably disposed on a sloped outer surface of the lower cone,wherein the transition shoulder is shaped so as to prevent the upper outer surface from moving completely into the passage of the lower cone, and wherein axial motion of the mandrel within the drillable plug pushes the lower cone axially along the mandrel to force the lower slip assembly radially outward to engage an inside wall of a casing within which the drillable plug is deployed.
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Abstract
A drillable plug includes a mandrel having an upper end and a lower axial section, the lower axial section having a geometry transition point separating an upper circular mandrel profile from a lower non-circular mandrel profile, a seal element disposed around the upper circular mandrel profile, and a lower cone having an inner surface forming a passage, the lower cone disposed around the lower non-circular mandrel profile whereby the lower cone is rotationally locked with the mandrel and a lower slip assembly moveably disposed on a sloped outer surface of the lower cone.
12 Citations
20 Claims
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1. A drillable plug, comprising:
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a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point having a transition shoulder separating an upper outer surface having a circular mandrel profile from a lower outer surface having a non-circular mandrel profile, the lower outer surface extending the length of the lower axial section from the geometry transition point to a bottom end of the mandrel; a seal element disposed around the upper outer surface; a lower cone having an inner surface forming a passage, the lower cone disposed around the lower outer surface of the mandrel, wherein the inner surface is configured to mate with the lower outer surface of the mandrel, whereby the lower cone is rotationally locked with the mandrel; and a lower slip assembly moveably disposed on a sloped outer surface of the lower cone, wherein the transition shoulder is shaped so as to prevent the upper outer surface from moving completely into the passage of the lower cone, and wherein axial motion of the mandrel within the drillable plug pushes the lower cone axially along the mandrel to force the lower slip assembly radially outward to engage an inside wall of a casing within which the drillable plug is deployed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
milling or drilling through a drillable plug that is set in a wellbore, the drillable plug comprising; a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point having a transition shoulder separating an upper outer surface having a circular mandrel profile from a lower outer surface having a non-circular mandrel profile, the lower outer surface extending the length of the lower axial section from the geometry transition point to a bottom end of the mandrel; an upper gage ring disposed around the mandrel adjacent the top end;
a seal element disposed around the upper outer surface;an upper cone disposed around the upper outer surface between the upper gage ring and the seal element; an upper slip assembly moveably disposed on a sloped outer surface of the upper cone; a lower cone having an inner surface forming a passage, the lower cone disposed around the lower outer surface of the mandrel, wherein the inner surface is configured to mate with the lower outer surface of the mandrel, whereby the lower cone is rotationally locked with the mandrel; and a lower slip assembly moveably disposed on a sloped outer surface of the lower cone, wherein the transition shoulder is shaped so as to prevent the upper outer surface from moving completely into the passage of the lower cone, and wherein axial motion of the mandrel within the drillable plug pushes the upper and lower cones axially along the mandrel to force the upper and lower slip assemblies radially outward to engage an inside wall of a casing within which the drillable plug is deployed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A drillable plug, comprising:
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a mandrel having a top end and a lower axial section, wherein the lower axial section comprises a geometry transition point having a transition shoulder separating an upper outer surface having a circular mandrel profile from a lower outer surface having a non-circular mandrel profile, the lower outer surface extending the length of the lower axial section from the geometry transition point to a bottom end of the mandrel; an upper gage ring disposed around the mandrel adjacent the top end;
a seal element disposed around the upper outer surface;an upper cone disposed around the upper outer surface between the upper gage ring and the seal element; an upper slip assembly moveably disposed on a sloped outer surface of the upper cone that is disposed between opposing side walls; a lower cone having an inner surface forming a passage comprising a circular section disposed about the upper outer surface and a non-circular section disposed around the lower outer surface whereby the lower cone is rotationally locked with the mandrel; a lower slip assembly moveably disposed on a sloped outer surface of the lower cone that is disposed between opposing side walls; and an end ring connected to a lower end of the seal element and comprising an axially extending member disposed in a recess formed in the inner surface of the lower cone, wherein the transition shoulder is shaped so as to prevent the upper outer surface from moving completely into the passage of the lower cone, and wherein axial motion of the mandrel within the drillable plug pushes the upper and lower cones axially along the mandrel to force the upper and lower slip assemblies radially outward to engage an inside wall of a casing within which the drillable plug is deployed. - View Dependent Claims (20)
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Specification