Casing patch seal
AssigneeA-Z International Tool Company
InventorsThomas F. Bailey, Nehal M. Shah
Life of this patent
Estimating the term…
Abstract
A casing patch for providing a connection between two casing sections which comprise a body means adapted to fit over an existing casing in a well bore and guide the patch into place, a slip means actuated by upward movement of the second casing section to tightly connect the two casing sections, and a seal means also actuated by upward movement of the second casing section for sealing the connection to pressure of fluids, under conditions of high pressure and temperature. The seal comprises a lead ring inside the casing patch surrounding the existing casing and a cylindrical seal arranged below the lead ring and having a central section of a deformable material and two end sections of wire mesh.
Claims15
A casing patch adapted to be run in a well bore for connecting a first casing section attached to the casing patch to a second casing section in the well and providing a tight seal of the connection upon the application of tension by the first casing section in an upward direction, comprising:
- body means having an inner surface adapted to fit over the outer surface of said second casing section,
- slip means within the body means adapted to fit over said outer surface of the second casing section for tightly connecting the first and second casing sections upon application of tension on the first casing section,
- seal means within said body means adapted to fit over said outer surface of the second casing section actuated by said tension on said first casing section for sealing the connection between said first and second casing sections,
- said slip means comprising an annular slip and an annular slip bowl, said slip telescoping within said slip bowl upon relative movement between said slip and said slip bowl, and means for radially contracting the end of said slip to tightly grip said outer surface of the second casing section upon relative movement between said slip and said slip bowl,
- said seal means comprising a lead ring and a compressible ring means formed of a first annular wire mesh ring, a second annular wire mesh ring and a ring of deformable material between said first and second wire mesh rings, said seal means being arranged within said body means with said compressible ring means below said lead ring, said seal means surrounding said second casing section so that upon application of said tension by the first casing section said body means compresses said first and second wire mesh rings to form a metal seal between said inner surface of the body means and said outer surface of the second casing section to define therebetween a sealed pocket wherein said deformable material is contained and, upon continued application of said tension said lead ring flows to form a seal between said inner surface and said outer surface and said deformable material is compressed to form a seal between said outer surface of the second casing section and said inner surface of the body means to prevent flow of said lead ring downward between said inner and outer surfaces, and
- means for limiting upward movement of said slip bowl relative to said slip.
A casing patch adapted to be run in a well bore for connecting a first casing section attached to the casing patch to a second casing section in the well and providing a tight seal at the connection upon the application of tension by the first casing section in an upward direction, comprising:
- body means having an inner surface adapted to fit over the outer surface of said second casing section;
- slip means within the body means adapted to fit over said outer surface of the second casing section for tightly connecting the first and second casing sections upon application of tension on the first casing section;
- said slip means comprising an annular slip and an annular slip bowl, said slip telescoping within said slip bowl upon relative movement between said slip and said slip bowl, and means for radially contracting the end of said slip to tightly grip said outer surface of the second casing section upon relative movement between said slip and said slip bowl;
- and
- resilient seal means within said body means adapted to fit over said outer surface of the second casing section actuated by said tension on said first casing section for sealing the connection between said first and second casing sections;
- said seal means comprising a lead ring, a first compressible ring means formed of a first annular wire mesh ring, a second annular wire mesh ring and a ring of deformable material between said first and second wire mesh rings, and a second compressible ring means formed of a first annular wire mesh ring, a second annular wire mesh ring and a ring of deformable material between said first and second wire mesh rings, said seal means being arranged within said body means with said lead ring disposed between said first and second compressible ring means so that upon application of said tension by the first casing section said body means compresses said wire mesh rings to form a metal seal between said body means and the second casing section.
A casing patch adapted to be run in a well bore for connecting a first casing section attached to the casing patch to a second casing section in the well and providing a tight seal of the connection upon the application of tension by the first casing section in an upward direction, comprising:
- body means having an inner surface adapted to fit over the outer surface of said second casing section;
- slip means within the body means adapted to fit over said outer surface of the second casing section for tightly connecting the first and second casing sections upon application of tension on the first casing section;
- said slip means comprising an annular slip and an annular slip bowl, said slip telescoping within said slip bowl upon relative movement between said slip and said slip bowl, and means for radially contracting the end of said slip to tightly grip said outer surface of the second casing section upon relative movement between said slip and said slip bowl;
- resilient seal means within said body means adapted to fit over said outer surface of the second casing section actuated by said tension on said first casing section for sealing the connection between said first and second casing sections;
- said seal means comprising a lead ring and a compressible ring means formed of a first annular wire mesh ring, a second annular wire mesh ring and a ring of deformable material between said first and second wire mesh rings, said seal means being arranged within said body means so that upon application of said tension by the first casing section said body means compresses said first and second wire mesh rings to form a metal seal between said body means and the second casing section;
- and
- means for preventing separation of said slip bowl relative to said seal means to maintain tension of said seal means.
Dependencies are inferred from the claim text.