Blowout preventer shearing ram

Patent metadata

Field	Value
Publication number	US-11286740-B2
Application number	US-202016854314-A
Country	US
Kind code	B2
Filing date	Apr 21, 2020
Priority date	Apr 21, 2019
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

A blowout preventer (BOP) includes a main body that includes a bore extending through the main body. The BOP also includes a cavity intersecting the bore and a pair of opposing shear rams configured to shear a tubular located in the bore. The opposing shear rams are two duplicate shear rams.

First claim

What is claimed is:

1. A blowout preventer (BOP) comprising:
a main body comprising a bore extending therethrough along a vertical axis and a cavity intersecting the bore; and
a pair of axially opposed shear rams configured to move through the cavity toward the bore to shear a tubular located in the bore, wherein the pair of axially opposed shear rams are two duplicate shear rams that are aligned with one another relative to the vertical axis,
wherein the pair of axially opposed rams comprises: a first shear ram with a first blade section; and a second shear ram with a second blade section, and
wherein the first blade section and the second blade section are aligned with one another relative to the vertical axis and together extend across an entirety of the bore along a lateral axis to facilitate shearing of the tubular and sealing of the bore.

2. The BOP of claim 1 ,
wherein the first shear ram further comprises: a first support section having a portion offset from the first blade section along the lateral axis
wherein the second blade section is positioned opposite the first support section of the first shear ram along a longitudinal axis, and
wherein the second shear ram further comprises: a second support section positioned opposite the first blade section of the first shear ram along the longitudinal axis.

3. The BOP of claim 2 , wherein, in an engaged configuration, a first surface of the first blade section of the first shear ram is configured to engage a second surface of the second support section of the second shear ram, and a third surface of the second blade section of the second shear ram is configured to engage a fourth surface of the first support section of the first shear ram.

4. The BOP of claim 2 , wherein, in an engaged configuration, a first inner surface of the first blade section of the first shear ram is configured to engage a second inner surface of the second blade section of the second shear ram.

5. The BOP of claim 2 , wherein the first support section of the first shear ram comprises a recess adjacent to the portion, wherein the recess is formed to maintain a position of the tubular positioned within the bore of the main body during engagement between the first shear ram and the tubular.

6. The BOP of claim 5 , wherein the first support section of the first shear ram comprises a notch extending off the recess to form an edge of the first support section, wherein the edge is configured to facilitate shearing of the tubular during engagement between the first shear ram and the tubular.

7. The BOP of claim 2 , wherein, in an engaged configuration, the first blade section is received within a respective pocket of the second support section, and the second blade section is received within a respective pocket of the first support section.

8. The BOP of claim 2 , wherein the first blade section occupies a first lateral half of the first shear ram, and the second blade section occupies a second lateral half of the second shear ram.

9. The BOP of claim 2 , wherein the first blade section and the second blade section are curved along the lateral axis.

10. A shear ram for a blowout preventer (BOP), the shear ram comprising:
a main body;
a first blade section extending from the main body;
a second blade section extending from the main body, wherein the second blade section is offset from the first blade section along a vertical axis to form a space between the first blade section and the second blade section; and
a third blade section positioned between the first blade section and the second blade section along the vertical axis, wherein the third blade section is offset from the space along a lateral axis,
wherein a thickness of the third blade section is substantially equal to a height of the space.

11. The shear ram of claim 10 , wherein the first blade section comprises a first blade surface oriented at a respective acute angle relative to a longitudinal axis such that a first portion of the first blade section extends farther from the main body than a second portion of the first blade section extends from the main body.

12. The shear ram of claim 11 , wherein the second blade section comprises a second blade surface oriented at a respective acute angle relative to the longitudinal axis such that a third portion of the second blade section extends farther from the main body than a fourth portion of the second blade section extends from the main body.

13. The shear ram of claim 12 , wherein the space is formed between the first portion of the first blade section and the third portion of the second blade section.

14. The shear ram of claim 10 , wherein the third blade section comprises a first inner blade surface facing the space, the first blade section comprises a second inner blade surface facing the space, the shear ram comprises a groove formed across the first inner blade surface and the second inner blade surface to a lateral edge of the first blade section, and the groove is configured to receive a seal element.

15. The shear ram of claim 10 , wherein the third blade section comprises a curved profile.

16. A blowout preventer (BOP), comprising:
a first shear ram; and
a second shear ram having a substantially identical profile as the first shear ram, wherein the second shear ram is positioned opposite the first shear ram along a longitudinal axis such that the second shear ram axially opposes the first shear ram, wherein the first shear ram and the second shear ram are translatable toward one another to shear a tubular within a bore of the BOP;
wherein each of the first and second shear rams comprises:
a first blade section;
a second blade section offset from the first blade section along a vertical axis to form a space between the first blade section and the second blade section; and
a third blade section positioned between the first blade section and the second blade section, wherein the third blade section is offset from the space along a lateral axis such that, in an engaged configuration, the third blade section of the first shear ram is configured to insert into the space of the second shear ram, and the third blade section of the second shear ram is configured to insert into the space of the first shear ram.

17. The BOP of claim 16 , wherein the first blade section of each of the first and second shear rams comprises a blade surface, and, in the engaged configuration, the blade surface of the first blade section of the first shear ram is configured to engage the blade surface of the first blade section of the second shear ram.

18. The BOP of claim 17 , wherein each of the first and second shear rams comprises:
a first recess formed into the blade surface of the first blade section; and
a second recess formed into the blade surface of the second blade section,
wherein the first recess and the second recess of the same blade section are stacked along a vertical axis to facilitate maintaining a position of a drill component extending through the BOP during engagement between the drill component with the first shear ram, the second shear ram, or both.

Assignees

• Cameron Int Corp
• Schlumberger Technology Corp

Inventors

• Nault Christopher
• Threadgill Micah

Classifications

• E21B33/063 Primary

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

• E21B33/064

  specially adapted for underwater well heads · CPC title

• E21B33/062

  with sliding rams · CPC title