Hammer shear ram
A wellbore assembly includes a housing and a ram assembly that includes a linear actuator, a reciprocating actuator, and a ram block. The housing is coupled to a blowout preventer coupled to a wellbore. The housing receives a wellbore pipe. The ram assembly is disposed at least partially within the housing. The linear actuator is coupled to the housing. The reciprocating actuator is coupled to an end of the linear actuator. The ram block is coupled to the reciprocating actuator. The linear actuator extends to bias the ram block against the wellbore pipe, and the reciprocating actuator moves the ram block in a reciprocating or vibratory motion against the wellbore pipe.
1. A wellbore assembly, comprising:
a housing configured to be coupled to a blowout preventer configured to be coupled to a wellbore, the housing configured to receive a wellbore pipe; and
a ram assembly configured to be disposed at least partially within the housing, the ram assembly comprising:
a linear actuator configured to be coupled to the housing;
a reciprocating actuator configured to be coupled to an end of the linear actuator; and
a ram block configured to be coupled to the reciprocating actuator;
wherein the linear actuator is configured to extend to bias the ram block against the wellbore pipe, and the reciprocating actuator comprises a cylinder rod and a reciprocating hammer or piston configured to strike the cylinder rod to move the ram block in a reciprocating or vibratory motion against the wellbore pipe.
2. The wellbore assembly of claim 1 , wherein the linear actuator comprises a linear actuator cylinder coupled to the housing and a linear actuator rod disposed at least partially within the linear actuator cylinder.
3. The wellbore assembly of claim 2 , wherein the linear actuator rod is fixed to the reciprocating actuator and configured to extend to move the reciprocating actuator and the ram block toward the wellbore pipe.
4. The wellbore assembly of claim 1 , wherein the wellbore assembly comprises a second ram assembly configured to be disposed at least partially within the housing and facing the ram assembly, the second ram assembly comprising:
a second linear actuator configured to be coupled to the housing;
a second reciprocating actuator configured to be coupled to an end of the second linear actuator; and
a second ram block configured to be coupled to the second reciprocating actuator.
5. The wellbore assembly of claim 4 , wherein the second linear actuator is configured to extend to bias the second ram block against a surface of the wellbore pipe opposite a surface engaged by the ram block, and the second reciprocating actuator is configured to move the second ram block in a reciprocating, vibratory motion against the wellbore pipe.
6. The wellbore assembly of claim 4 , wherein the ram block comprises a shear ram block and the second ram block comprises a second shear ram block configured to cut, with the ram block, the wellbore pipe.
7. The wellbore assembly of claim 1 , wherein the linear actuator comprises a hydraulic actuator and the reciprocating actuator comprises one of an electrical reciprocating actuator, a hydraulic reciprocating actuator, or a pneumatic reciprocating actuator.
8. The wellbore assembly of claim 1 , wherein the reciprocating actuator is fluidly coupled to a hydraulic circuit comprising a hydraulic fluid that moves a piston of the reciprocating actuator in a reciprocating motion.
9. The wellbore assembly of claim 1 , wherein the reciprocating hammer is configured to strike reciprocating blows on an outwardly projecting shoulder of the cylinder rod, moving the ram block in the reciprocating or vibratory motion against the wellbore pipe.
10. The method of claim 9 , wherein the reciprocating hammer comprises a ring-shaped piston residing around the cylinder rod and fluidly coupled to a hydraulic circuit that moves the ring-shaped piston in the reciprocating or vibratory motion to strike the outwardly projecting shoulder.
11. A wellbore assembly, comprising:
a housing configured to be coupled to a blowout preventer configured to be coupled to a wellbore, the housing configured to receive a wellbore pipe; and
a ram assembly configured to be disposed at least partially within the housing, the ram assembly comprising:
a linear actuator configured to be coupled to the housing;
a reciprocating actuator configured to be coupled to an end of the linear actuator; and
a ram block configured to be coupled to the reciprocating actuator;
wherein the linear actuator is configured to extend to bias the ram block against the wellbore pipe, and the reciprocating actuator is configured to move the ram block in a reciprocating or vibratory motion against the wellbore pipe;
wherein the reciprocating actuator comprises:
a cylinder rod comprising a first end configured to be coupled to and movable by the linear actuator, and a second, opposite end coupled to the ram block, the cylinder rod comprising an outwardly projecting shoulder between the first end and the second end; and
a reciprocating hammer residing between the outwardly projecting shoulder and the linear actuator.
12. The wellbore assembly of claim 11 , wherein the reciprocating hammer is configured to strike reciprocating blows on the outwardly projecting shoulder, moving the ram block in the reciprocating or vibratory motion against the wellbore pipe.
13. The wellbore assembly of claim 11 , wherein the reciprocating hammer comprises a ring-shaped piston residing around the cylinder rod and fluidly coupled to a hydraulic circuit that moves the ring-shaped piston in the reciprocating or vibratory motion.
14. A wellbore assembly, comprising:
a housing configured to be coupled to a blowout preventer configured to be coupled to a wellbore, the housing configured to receive a wellbore pipe; and
a ram assembly configured to be disposed at least partially within the housing, the ram assembly comprising:
a linear actuator configured to be coupled to the housing;
a reciprocating actuator configured to be coupled to an end of the linear actuator; and
a ram block configured to be coupled to the reciprocating actuator;
wherein the linear actuator is configured to extend to bias the ram block against the wellbore pipe, and the reciprocating actuator is configured to move the ram block in a reciprocating or vibratory motion against the wellbore pipe;
wherein the reciprocating actuator comprises:
a cylinder configured to be coupled to and movable by the linear actuator;
a reciprocating piston residing within the cylinder; and
a cylinder rod disposed partially within the cylinder and movable by the reciprocating piston.
15. The wellbore assembly of claim 14 , wherein the ram assembly comprises a ram shaft comprising a first end fixed to the cylinder rod and a second, opposite end fixed to the ram block, and the reciprocating piston is configured to strike reciprocating blows on the cylinder rod, moving the ram block in a vibratory motion against the wellbore pipe.
16. A method, comprising:
actuating a linear actuator of a ram to move a ram block toward a wellbore pipe, the ram comprising a reciprocating actuator attached to and disposed between the linear actuator and the ram block, the reciprocating actuator comprising a cylinder rod and a reciprocating hammer or piston configured to strike the cylinder rod, the ram comprising a ram body coupled to a blowout preventer and configured to receive the wellbore pipe; and
actuating the reciprocating actuator to cause the reciprocating hammer or piston to strike the cylinder rod to move the ram block in a reciprocating or vibratory motion against the wellbore pipe.
17. The method of claim 16 , wherein actuating the reciprocating actuator comprises actuating the reciprocating actuator such that the reciprocating actuator reciprocates the ram block as the linear actuator biases the ram block toward the wellbore pipe.
18. The method of claim 16 , wherein actuating the linear actuator comprises activating a first hydraulic circuit fluidly coupled to the linear actuator and comprising a hydraulic fluid that moves, upon activation of the hydraulic circuit, the cylinder rod of the linear actuator.
19. The method of claim 18 , wherein actuating the reciprocating actuator comprises activating a second hydraulic circuit fluidly coupled to the reciprocating actuator.
20. The method of claim 16 , further comprising, after actuating the reciprocating actuator, actuating the linear actuator, retracting the linear actuator.
21. A method, comprising:
actuating a linear actuator of a ram to move a ram block toward a wellbore pipe, the ram comprising a reciprocating actuator attached to and disposed between the linear actuator and the ram block, the ram comprising a ram body coupled to a blowout preventer and configured to receive the wellbore pipe; and
actuating the reciprocating actuator to move the ram block in a reciprocating or vibratory motion against the wellbore pipe;
wherein actuating the reciprocating actuator comprises actuating the reciprocating actuator such that the reciprocating actuator reciprocates the ram block as the linear actuator biases the ram block toward the wellbore pipe; and
wherein the reciprocating actuator reciprocates the ram block such that the ram block impacts the wellbore pipe with enough force and vibration to cause the wellbore pipe to break.
22. The method of claim 21 , wherein actuating the reciprocating actuator comprises moving a reciprocating hammer of the reciprocating actuator to strike, with the reciprocating hammer, reciprocating blows on an outwardly projecting shoulder of a cylinder rod coupled with the ram block to move the ram block in the reciprocating or vibratory motion against the wellbore pipe.
23. A method, comprising:
actuating a linear actuator of a ram to move a ram block toward a wellbore pipe, the ram comprising a reciprocating actuator attached to and disposed between the linear actuator and the ram block, the ram comprising a ram body coupled to a blowout preventer and configured to receive the wellbore pipe; and
actuating the reciprocating actuator to move the ram block in a reciprocating or vibratory motion against the wellbore pipe;
wherein actuating the linear actuator comprises activating a first hydraulic circuit fluidly coupled to the linear actuator and comprising a hydraulic fluid that moves, upon activation of the hydraulic circuit, a cylinder rod of the linear actuator;
wherein actuating the reciprocating actuator comprises activating a second hydraulic circuit fluidly coupled to the reciprocating actuator; and
wherein the second hydraulic circuit comprises a hydraulic fluid that alternately moves, upon activation of the second hydraulic circuit, a reciprocating piston of the reciprocating actuator, the reciprocating piston configured to strike reciprocating blows on a rod coupled to the ram block, moving the ram block in a vibratory motion against the wellbore pipe.
24. The method of claim 23 , wherein actuating the reciprocating actuator comprises moving a reciprocating hammer of the reciprocating actuator to strike, with the reciprocating hammer, reciprocating blows on an outwardly projecting shoulder of a cylinder rod coupled with the ram block to move the ram block in the reciprocating or vibratory motion against the wellbore pipe.