Blowout preventer

1. A blowout preventer comprising:

a body containing a wellbore;

a passage transverse to the wellbore;

the passage extending along a first side of the wellbore and having a first distal end spaced apart from the wellbore, and along a second side of the wellbore and having a second distal end spaced apart from the wellbore;

a shearing device located in the passage;

a charge that, when activated, propels the shearing device along the passage and across the wellbore; and

an arresting mechanism disposed in the passage, separated and spaced apart from the first distal end and the second distal end of the passage,

wherein the arresting mechanism is configured to absorb energy from the shearing device

wherein the arresting mechanism is configured to collapse as it absorbs energy from the shearing device.

2. The blowout preventer of claim 1 wherein the arresting mechanism is disposed in the passage proximate the wellbore.

3. The blowout preventer of claim 1 wherein the arresting mechanism is disposed in the passage on the second side of the wellbore.

4. The blowout preventer of claim 1 wherein the shearing device is disposed in the passage on the first side of the wellbore.

5. The blowout preventer of claim 1 further comprising a retaining device that retains the shearing device in a predefined position in the passage until activation of the charge occurs.

6. The blowout preventer of claim 1 further comprising a seal to fluidly seal the passage from the wellbore.

7. The blowout preventer of claim 1 wherein the shearing device is configured to sever anything present in the wellbore when the shearing device is propelled across the wellbore.

8. The blowout preventer of claim 1 wherein the shearing device has a body section that substantially blocks the wellbore when the shearing device is propelled across the wellbore.

9. The blowout preventer of claim 1 further comprising a fluid disposed in a portion of the passage.

10. A method of operating a blowout preventer having a body with a wellbore traversing therein, comprising:

activating a charge linked to a passage transverse to the wellbore, the passage extending along a first side of the wellbore and having a first distal end spaced apart from the wellbore, and along a second side of the wellbore and having a second distal end spaced apart from the wellbore,

wherein the activated charge propels a shearing device along the passage and across the wellbore; and

absorbing energy from the propelled shearing device with an arresting mechanism disposed in the passage, the arresting mechanism being separated and spaced apart from the first distal end and the second distal end of the passage

wherein the arresting mechanism is configured to collapse as it absorbs energy from the shearing device.

11. The method of claim 10 wherein the arresting mechanism is disposed in the passage proximate the wellbore.

12. The method of claim 10 wherein the arresting mechanism is disposed in the passage on the second side of the wellbore.

13. The method of claim 10 wherein the shearing device is disposed in the passage on the first side of the wellbore.

14. The method of claim 10 further comprising a retaining device that retains the shearing device in a predefined position in the passage until activation of the charge occurs.

15. The method of claim 10 further comprising fluidly sealing the passage from the wellbore.

16. The method of claim 10 wherein the shearing device is configured to sever anything present in the wellbore when the shearing device is propelled across the wellbore.

17. The method of claim 10 further comprising blocking the wellbore with the shearing device when the shearing device is propelled across the wellbore.

18. The method of claim 10 further comprising disposing a fluid in a portion of the passage.