Stinger with metal c-ring seal

Patent metadata

Field	Value
Publication number	US-2017022775-A1
Application number	US-201615150945-A
Country	US
Kind code	A1
Filing date	Jun 8, 2016
Priority date	May 8, 2015
Publication date	Jan 26, 2017
Grant date	—

Abstract

An oilfield tubular, such as a stinger ( 1 ), designed to be installed in a tubing hanger ( 2 ) in an XMT (Christmas tree) located on the sea bed, is presented. The oilfield tubular ( 1 ) is exposed to the production bore ( 4 ) pressure, and includes axial sealing means ( 6 ) located on an end ( 1 a ) of the tubular ( 1 ). The axial sealing means ( 6 ) includes a metal c-ring seal ( 6 a ), which metal c-ring seal ( 6 a ) is smaller in cross section than the thickness (t 1 ) of the oilfield tubular wall ( 1 c ). The opening ( 6 b ) of the metal c-ring seal ( 6 a ) is facing the high pressure side of the production bore ( 4 ). This pressure tend to expand the c-profile to firm engagement with contacting surfaces.

First claim

1 . An oilfield tubular designed to be installed in a tubing hanger in an XMT (Christmas tree) located on the sea bed, which oilfield tubular is exposed to the production bore pressure, said oilfield tubular comprising: axial sealing means located on an end of said oilfield tubular, said axial sealing means includes a metal c-ring seal and an external ledge or shoulder at said end, said shoulder supports said metal c-ring seal, wherein said metal c-ring seal is smaller in cross section than a thickness (t 1 ) of an oilfield tubular wall and the opening of said metal c-ring seal is facing the high pressure side of the production bore, which pressure tend to expand a c-profile of said metal c-ring seal to film engagement with contacting surfaces, wherein said oilfield tubular has a shoulder that includes a V or U shaped seat (s), said seat (s) is designed to receive and support said metal c-ring seal.

2 . The oilfield tubular according to claim 1 , wherein said opening of said metal c-ring seal is facing in the axial direction of said oilfield tubular and away from said oilfield tubular.

3 . The oilfield tubular according to claim 1 , wherein said metal c-ring seal makes sealing contact with a bore wall in said tubing hanger adapted to receive said oilfield tubular, in addition to sealing contact with an external surface of said oilfield tubular, said external surface is part of said shoulder and is opposing said bore wall.

4 . The oilfield tubular according to claim 1 wherein said metal c-ring seal is less than 1-5 mm in cross section.

5 . The oilfield tubular according to claim 1 , wherein said metal c-ring seal is made of a corrosion resistant alloy, such as Inconel.

6 . The oilfield tubular according to claim 1 , wherein said metal c-ring seal has a wall thickness (t 2 ) in the range of 0.01 to 0.25 mm.

7 . The oilfield tubular according to claim 1 , wherein said shoulder is an angular notch.

8 . The oilfield tubular according to claim 1 , wherein said shoulder is defined by one transversally extending surface and one axially extending surface, both surfaces and supporting said metal c-ring seal.

9 . The oilfield tubular according to claim 2 , wherein said metal c-ring seal makes sealing contact with a bore wall in said tubing hanger adapted to receive said oilfield tubular, in addition to sealing contact with an external surface of said oilfield tubular, said external surface is part of said shoulder and is opposing said bore wall.

10 . The oilfield tubular according to claim 1 , wherein said shoulder is a 90 degree notch.

Assignees

• Aker Solutions As

Inventors

• Spitz Stuart
• Topolski Lukasz

Classifications

• E21B33/00 Primary

  Sealing or packing boreholes or wells · CPC title

• E21B33/04

  Casing heads; Suspending casings or tubings in well heads · CPC title

• E21B2200/01

  Sealings characterised by their shape · CPC title

• E21B33/1212 Primary

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

• E21B33/0422 Primary

  a suspended tubing or casing being gripped by a slip or an internally serrated member · CPC title