Blowout preventer with shear ram

Patent metadata

Field	Value
Publication number	US-9976373-B2
Application number	US-201514843748-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Sep 2, 2015
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A blowout preventer may be used for shearing an object positioned in a vertical bore extending through the blowout preventer. The blowout preventer includes a shear ram movable towards the tubular, the shear ram including a biasing mechanism for biasing against an interior surface of the blowout preventer body. In this way, the biasing mechanism urges the shear ram into axial engagement with an opposing shear ram movable towards the tubular during shearing operations. The biasing mechanism comprises a biasing member, such as a coiled spring, coned-disc spring, and/or coned-disc washer which urges the biasing mechanism into contact with the inner portion of the blowout preventer body.

First claim

What is claimed is:

1. A shear ram positionable in a blowout preventer (“BOP”) body to shear an object located in a vertical bore of the BOP body, the shear ram comprising:
a ram body configured to move within the BOP body and including a shear blade configured to shear the object; and
a biasing mechanism configured to bias against an interior surface of the BOP body, the biasing mechanism comprising:
a wear pad carried by the ram body and configured to move with respect to an outer surface of the ram body; and
a biasing element carried by the ram body and configured to bias the wear pad against the interior surface of the BOP body.

2. The shear ram of claim 1 , further comprising a plurality of wear pads located on the outer surface of the ram body.

3. The shear ram of claim 1 , wherein the biasing element comprises one or more of a coiled spring, a coned-disc spring, and a coned disc-washer.

4. The shear ram of claim 1 , further comprising a plurality of biasing elements.

5. The shear ram of claim 1 , wherein the object is at least one of a drill pipe joint, a casing joint, a tool joint, and a wireline, such that the shear ram is configured to shear each of the drill pipe joint, the casing joint, the tool joint, and the wireline.

6. The shear ram of claim 1 , wherein the biasing mechanism is located on top of the ram body.

7. The shear ram of claim 1 , wherein the biasing mechanism is located on bottom of the ram body.

8. The shear ram of claim 1 , wherein the biasing mechanism is further configured to force the shear ram into axial engagement with an opposing shear ram during shearing operations.

9. The shear ram of claim 8 , wherein the opposing ram also comprises a biasing mechanism configured to force the opposing shear ram into axial engagement with the shear ram during shearing operations.

10. The shear ram of claim 1 , wherein the interior surface is a surface of a ram cavity.

11. A blowout preventer (“BOP”) apparatus comprising:
a body comprising a vertical bore extending through the body and a ram cavity intersecting the bore;
a pair of opposing hydraulically actuated shear rams comprising a first shear ram and a second shear ram each configured to move within the BOP body and shear an object located in the vertical bore, the first ram comprising a biasing mechanism configured to bias against an interior surface of the BOP body to urge the first shear ram into axial engagement with the second shear ram, the biasing mechanism comprising:
a wear pad carried by the first ram and configured to move with respect to an outer surface of the first ram; and
a biasing element carried by the first ram and configured to bias the wear pad against the interior surface of the BOP body.

12. The blowout preventer apparatus of claim 11 , the first shear ram further comprising an upper cutting face and the second shear ram further comprising a lower cutting face, wherein the upper and lower cutting faces are configured to interlock during shearing operations.

13. The blowout preventer apparatus of claim 11 , further comprising a plurality of wear pads located on the outer surface of the first shear ram.

14. The blowout preventer apparatus of claim 11 , further comprising a plurality of biasing elements.

15. The blowout preventer apparatus of claim 11 , wherein the second shear ram has a biasing mechanism configured to force the second shear ram into axial engagement with the first shear ram.

16. The blowout preventer apparatus of claim 15 , wherein the second shear ram biasing mechanism is located on the bottom of the second shear ram.

17. The blowout preventer apparatus of claim 11 , wherein the object is at least one of a drill pipe joint, a casing joint, a tool joint, and a wireline, such that the first shear ram and second shear ram are configured to shear each of the drill pipe joint, the casing joint, the tool joint, and the wireline.

18. The blowout preventer apparatus of claim 11 , wherein the biasing mechanism is configured to be retrofittedly coupled to the first shear ram.

19. The blowout preventer apparatus of claim 11 , wherein the biasing mechanism is further configured to force the first shear ram into axial engagement with the second shear ram.

Assignees

• Cameron Int Corp

Inventors

• Araujo Raul
• Lambert Jeffrey

Classifications

• E21B33/063 Primary

  for shearing drill pipes (cutting of wireline E21B29/04) · CPC title