Blowout preventer shearing ram

Patent metadata

Field	Value
Publication number	US-12139991-B2
Application number	US-202017604467-A
Country	US
Kind code	B2
Filing date	Apr 21, 2020
Priority date	Apr 21, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

A blowout preventer (BOP) includes a main body comprising a bore extending therethrough and a pair of opposing upper and lower rams configured to shear a tubular extending through the bore. The upper ram includes a first sloped surface oriented crosswise to a vertical axis, the lower ram comprises a second sloped surface oriented crosswise to the vertical axis, and the first sloped surface and the second sloped surface are parallel to one another.

First claim

What is claimed is:

1. A pair of opposing shear rams for a blowout preventer (BOP), the pair of opposing shear rams comprising:
a first shear ram comprising a center blade edge, first recesses positioned at opposite sides of the center blade edge along a lateral axis, and first transition edges positioned at opposite sides of each of the first recesses along the lateral axis, wherein one of the center blade edge and a pair of the first transition edges positioned at the opposite sides of one of the first recesses is configured to engage a tubular extending through the BOP during engagement between the tubular and the first shear ram; and
a second shear ram comprising a center recess, second recesses positioned at opposite sides of the center recess along the lateral axis, and second transition edges positioned at laterally-outer sides of the center recess along the lateral axis, wherein the center recess is configured to be positioned opposite the center blade edge of the first shear ram along a longitudinal axis,
wherein the second shear ram comprises lateral surfaces each extending inwardly from a respective lateral side to one of the second transition edges, and the lateral surfaces are angled to guide the tubular toward the center recess.

2. The pair of opposing shear rams of claim 1 , wherein the first shear ram comprises tapered surfaces angled inwardly toward one of the first recesses along the longitudinal axis, and the tapered surfaces are configured to guide the tubular toward one of the first recesses upon engagement with the tubular.

3. The pair of opposing shear rams of claim 1 , wherein the first shear ram comprises a first blade surface comprising the center blade edge, the first recesses, and the first transition edges, the second shear ram comprises a second blade surface comprising the center recess, the second recesses, and the second transition edges, and the first blade surface is configured to be positioned above the second blade surface along a vertical axis.

4. The pair of opposing shear rams of claim 1 , wherein the first shear ram comprises a first sloped surface oriented crosswise to a vertical axis, the second shear ram comprises a second sloped surface oriented crosswise to the vertical axis, and the first sloped surface and the second sloped surface are oriented at the same angle relative to the longitudinal axis.

5. The pair of opposing shear rams of claim 4 , wherein the first sloped surface is above the center blade edge along the vertical axis, and the second sloped surface is below the center recess along the vertical axis.

6. The pair of opposing shear rams of claim 1 , wherein the first shear ram is an upper shear ram, and the second shear ram is a lower shear ram.

7. A blowout preventer (BOP) comprising:
a bore extending therethrough and configured to receive a tubular;
an upper shear ram comprising a first sloped surface that terminates to form a first blade surface, wherein the first blade surface comprises a center blade edge, recesses positioned at opposite sides of the center blade edge along a lateral axis, and first transition edges positioned at opposite sides of each of the recesses along the lateral axis, and wherein the first sloped surface is oriented crosswise with a vertical axis and positioned above the first blade surface relative to the vertical axis; and
a lower shear ram comprising a second sloped surface extending from a second blade surface, wherein the second blade surface comprises a center recess aligned along a respective center axis of the lower shear ram, notches positioned at opposite sides of the center recess along the lateral axis, and second transition edges positioned at laterally-outer sides of the center recess along the lateral axis,
the lower shear ram further comprising lateral surfaces each extending inwardly from a respective lateral side to one of the second transition edges, and the lateral surfaces are angled to guide the tubular toward the center recess,
the lower shear ram being configured to guide the tubular toward the center blade edge of the upper shear ram to facilitate shearing of the tubular as the upper shear ram and the lower shear ram translate toward one another along a longitudinal axis.

8. The BOP of claim 7 , wherein the upper shear ram comprises an arm offset from the first blade surface along the vertical axis to form a slot spanning between the arm and the first blade surface, and a portion of the lower shear ram is configured to insert into the slot during engagement between the upper shear ram and the lower shear ram to seal the bore.

9. The BOP of claim 7 , wherein the second sloped surface is positioned below the second blade surface relative to the vertical axis, and the first sloped surface and the second sloped surface are parallel to one another.

10. The BOP of claim 7 , wherein the first blade surface extends along the vertical axis to reduce a pressure imparted by the tubular onto the first blade surface during engagement between the upper shear ram and the tubular.

11. A blowout preventer (BOP) comprising:
a main body comprising a bore extending therethrough; and
a pair of opposing upper and lower rams configured to shear a tubular extending through the bore, wherein the upper ram comprises a first sloped surface oriented crosswise to a vertical axis, the lower ram comprises a second sloped surface oriented crosswise to the vertical axis, and the first sloped surface and the second sloped surface are parallel to one another,
wherein the first sloped surface of the upper ram terminates to form a first blade surface, the first blade surface comprising a center blade edge aligned along a respective center axis of the upper ram, first recesses positioned at opposite sides of the center blade edge along a lateral axis, and first transition edges positioned at opposite sides of each of the first recesses along the lateral axis,
wherein the first transition edges of the upper ram are positioned at opposite sides of each of the first recesses along the lateral axis such that each first recess corresponds to a pair of first transition edges,
wherein the lower ram comprises a second blade surface comprising a center recess aligned along a respective center axis of the lower ram, notches positioned at opposite sides of the center recess along the lateral axis, second transition edges positioned at laterally-outer sides of the center recess along the lateral axis, and third transition edges formed by the notches,
wherein each third transition edge of the lower ram is positioned opposite a corresponding pair of the first transition edges of the upper ram along a longitudinal axis, and
wherein the lower ram further comprises lateral surfaces each extending inwardly from a respective lateral side toward an adjacent notch and an adjacent third transition edge at an angle relative to the lateral axis, and the lateral surfaces are angled to guide the tubular toward the center recess.

12. The BOP of claim 11 , wherein the recesses are symmetrically positioned about the center axis of the upper ram.

13. The BOP of claim 11 , wherein the center recess is configured to position the tubular along the center axis of the lower ram when engaged with the tubular.

14. The BOP of claim 13 , wherein the lower ram comprises a blade section having a portion comprising the second sloped surface and the second blade surface, the upper ram comprises a slot, and the portion is configured to insert into the slot while the upper ram and the lower ram engage one another.

15. The BOP of claim 14 , wherein the second sloped surface is below the se

Assignees

• Schlumberger Technology Corp

Inventors

• Threadgill Micah

Classifications

• E21B33/063 Primary

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