Wear-resistant and self-lubricant bore receptacle packoff tool

Patent metadata

Field	Value
Publication number	US-2016333657-A1
Application number	US-201514710674-A
Country	US
Kind code	A1
Filing date	May 13, 2015
Priority date	May 13, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A packoff assembly comprises: a tubing connectable mandrel; and at least one packoff element disposed on the mandrel; the packoff element comprising an annular seal comprising a carbon composite and having an inner surface and an opposing outer surface; the inner surface being in contact with a surface of the mandrel; a wear-resistant member at least partially encapsulating the seal; an annular guide member disposed on the mandrel; and a retainer member disposed between the guide member and the mandrel for securing the guide member to a predetermined position on the mandrel.

First claim

What is claimed is:

1 . A packoff element comprising
a carbon composite seal; a wear-resistant member at least partially encapsulating the seal; and a guide member disposed on an end of the packoff element.

2 . The packoff element of claim 1 , further comprising a retainer member for securing the guide member to a predetermined position on a mandrel.

3 . The packoff element of claim 1 , wherein the carbon composite comprises carbon and a binder containing one or more of the following: SiO 2 ; Si; B; B 2 O 3 ; a metal; or an alloy of the metal; and wherein the metal is one or more of the following: aluminum; copper; titanium; nickel; tungsten; chromium; iron; manganese; zirconium; hafnium; vanadium; niobium; molybdenum; tin; bismuth; antimony; lead; cadmium; or selenium.

4 . The packoff element of claim 1 , wherein the seal further comprises at least one elastic metallic structure.

5 . The packoff element of claim 4 , wherein at least one elastic metallic structure comprises a V ring; an O ring; a C ring; or an E ring.

6 . The packoff element of claim 1 , wherein the wear-resistant member comprises a wear-resistant coating disposed on a surface of the seal.

7 . The packoff element of claim 6 , wherein the wear-resistant coating comprises a carbon composite and a reinforcing agent comprising one or more of the following: an oxide, a nitride, a carbide, an intermetallic compound, a metal, a metal alloy, a carbon fiber; carbon black; mica; clay; a glass fiber; or a ceramic material.

8 . The packoff element of claim 6 , wherein the wear-resistant coating has a gradient in the weight ratio of the carbon composite to the reinforcing agent; and wherein the gradient comprises a decreasing weight ratio of the carbon composite to the reinforcing agent from the inner portion of the wear-resistant coating to the outer portion of the wear-resistant coating.

9 . The packoff element of claim 1 , wherein the wear-resistant member comprises a mesh encapsulating the seal, the mesh comprising one or more of a metal mesh; a glass mesh; a carbon mesh; or an asbestos mesh.

10 . The packoff element of claim 1 , wherein the guide member comprises a nickel alloy, steel, graphite, or a carbon composite.

11 . A packoff assembly comprising:
a tubing connectable mandrel; and at least one packoff element disposed on the mandrel; the packoff element comprising: an annular seal comprising a carbon composite and having an inner surface and an opposing outer surface; the inner surface being in contact with a surface of the mandrel; a wear-resistant member at least partially encapsulating the seal; an annular guide member disposed on the mandrel; and a retainer member disposed between the guide member and the mandrel for securing the guide member to a predetermined position on the mandrel.

12 . The packoff assembly of claim 11 , further comprising a spacing member disposed between the guide member and the seal, wherein the spacing member is mechanically locked with the guide member.

13 . The packoff assembly of claim 11 , further comprising a backup member attached to the seal.

14 . The packoff assembly of claim 11 , comprising
a tubing connectable mandrel; and at least one packoff element disposed on a surface of the mandrel; the packoff element having an opposing first and second ends and comprising:
an annular seal comprising a carbon composite and having an inner surface and an opposing outer surface; the inner surface being in contact with a surface of the mandrel;
a wear-resistant member at least partially encapsulating the seal
a first annular guide member disposed on the first end of the packoff element;
a second annular guide member disposed on the second end of the packoff element;
a first retainer member disposed between the first guide member and the mandrel for securing the first guide member to the mandrel; and
a second retainer member disposed between the second guide member and the mandrel for securing the second guide member to the mandrel.

15 . The packoff assembly of claim 14 , wherein the seal is locked between the first guide member and the second guide member.

16 . The packoff assembly of claim 11 , wherein the wear-resistant member is a wear-resistant coating disposed on the outer surface of the annular seal.

17 . The packoff assembly of claim 11 , wherein the wear-resistant member is a mesh disposed on both the inner surface and the outer surface of the annular seal.

18 . The packoff assembly of claim 11 , wherein the annular seal further comprises at least one elastic metallic structure.

19 . A method of sealing, the method comprising:
positioning at least one packoff element of claim 1 onto a mandrel; guiding the packoff element towards a wellbore casing; compressing the packoff element; and sealing an annular area between the mandrel and the wellbore casing.

20 . The method of claim 19 , wherein the packoff element further comprises a retainer member disposed between the guide member and the mandrel for securing the guide member to the mandrel.

21 . The method of claim 20 , wherein positioning the annular packoff element on a mandrel comprises disposing the retainer member on a cooperative recess on the mandrel.

22 . The method of claim 19 , wherein guiding the packoff element towards a wellbore casing comprises sliding the guide member of the packoff element along an angled surface of a casing bore receptacle.

23 . The method of claim 19 , wherein the packoff element is compressed when the packoff element is guided to a section of a casing bore receptacle having an inner bore diameter that is smaller than the outer diameter of the annular seal of the packoff element.

Assignees

• Zhao Lei
• Xu Zhiyue
• Deng Guijun
• Baker Hughes Inc

Inventors

• Zhao Lei
• Xu Zhiyue
• Deng Guijun

Classifications

• E21B33/1212 Primary

  including a metal-to-metal seal element · CPC title

• E21B33/12 Primary

  Packers; Plugs (used for cementing E21B33/134, E21B33/16) · CPC title

• E21B33/1208 Primary

  characterised by the construction of the sealing or packing means (E21B33/1277 takes precedence) · CPC title