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US 2003/0164236 A1Published application
Downhole tools
AssigneeBrunel Oilfield Services (UK) Limited
InventorJohn Thomas Oliver Thornton
Life of this patent
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AssigneeBrunel Oilfield Services (UK) Limited
InventorJohn Thomas Oliver Thornton
Estimating the term…
There is disclosed an improved centraliser (210) for centralisation of tubulars (250) such as casings, liners, production tubing, production screens and the like, in oil/gas wells. Known centralisers are of a “unitary construction”, i.e. made in one piece fro m one material. This provides numerous problems in the prior art since the chosen material must provide conflicting characteristics at different times and places. Accordingly, the invention provides a centraliser (210) comprising a tubular body (214), a portion of an outermost surface (212) of said tubular body (214) being formed from a first material and a portion of or adjacent to at least one end (218) of said tubular body and/or a portion of an innermost surface (222) being formed from second material(s), the first material having a lower Youngs modulus than the second material(s).
A centraliser comprising a tubular body, a portion of an outermost surface of said tubular body being formed substantially from a first material and a portion of or adjacent to at least one end of said tubular body being formed substantially from a second material, the first material having a lower Youngs modulus than the second material.
A centraliser comprising a tubular body, a portion of an outermost surface of said tubular body being formed substantially from a first material and a portion of an innermost surface of said tubular body being formed substantially from a second material, the first material having a lower Youngs modulus than the second material.
A centraliser as claimed in any preceding claim, wherein the outermost surface of said body provides or comprise a plurality of raised portions.
A centraliser as claimed in any preceding claim, wherein the second material is a metallic material.
A centraliser as claimed in any preceding claim, wherein the centraliser includes a reinforcing means such as a cage, mesh, bars, rings and/or the like.
A centraliser as claimed in any preceding claim, wherein at least part of the centraliser is formed from a casting process.
A centraliser as claimed in any preceding claim, wherein a body of the second material is retained relative to a body of the first material by an interference fit.
Centralising apparatus for use in a well-bore, the centralising apparatus including a tubular section and at least one centraliser located thereupon, wherein the centraliser comprises a tubular body, a portion of an outermost surface of said tubular body being formed from a first material and a portion of or adjacent to at least one end of said tubular body being formed from a second material, the first material having a lower Youngs modulus than the second material.
Centralising apparatus for use in a well-bore, the centralising apparatus including a tubular section and at least one centraliser located thereupon, wherein the centraliser comprises a tubular body, a portion of an outermost surface of said tubular body being formed from a first material and a portion of an innermost surface of said tubular body being formed from a second material, the first material having a lower Youngs modulus than the second material.
A method of fixing a casing or liner into a well-bore, the method comprising the steps of:
A method of completing a well, the method comprising the steps of:
A method of gravel packing a well, the method including the steps of:
A drilltool or downhole tool having a tubular body, a portion of an outermost surface of said tubular body being formed from a first material and a portion of or adjacent to at least one end of said tubular body, and/or a portion of an innermost surface of said tubular body being formed from second material(s), the first material having a lower Youngs modulus than the second material.
Dependencies are inferred from the claim text.