Tubular severing system and method of using same
AssigneeNational Oilwell Varco, L.P.
InventorsFrank Benjamin Springett, Christopher Dale Johnson, Shern Eugene Peters, Eric Trevor Ensley
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Abstract
A method for severing a tubular of a wellbore is provided. The method involves positioning a blowout preventer about a tubular, the blowout preventer having a plurality of rams slidably positionable therein and a plurality of blades carried by the rams for engaging the tubular. The method further involves piercing the tubular with a piercing point of at least one of the blades such that a portion of the tubular is dislodged therefrom, and raking through the tubular with a cutting surface of at least one of the blades.
Claims22
A method for severing a tubular of a wellbore, the wellbore penetrating a subterranean formation, the method comprising:
- positioning a blowout preventer about a tubular, the blowout preventer having a plurality of rams slidably positionable therein and a plurality of blades carried by the plurality of rams for engaging the tubular;
- piercing the tubular with a piercing point of at least one of the plurality of blades such that a portion of the tubular is dislodged therefrom;
- and
- raking through the tubular with a cutting surface of at least one of the plurality of blades.
A method for severing a tubular of a wellbore, the wellbore penetrating a subterranean formation, the method comprising:
- positioning a blowout preventer about the tubular, the blowout preventer comprising a plurality of rams slidably positionable therein, each of the plurality of rams carrying a blade, each of the blades comprising:
- a blade body having a front face on a side thereof facing the tubular, the blade body comprising:
- a cutting surface along at least a portion of the front face;
- and
- a piercing point along the front face, the piercing point having a tip extending a distance beyond the cutting surface;
- piercing the tubular with the piercing point of the blade such that a portion of the tubular is dislodged therefrom;
- and
- raking through the tubular with the cutting surface of the blade.
A method for severing a tubular of a wellbore, the wellbore penetrating a subterranean formation, the method comprising:
- positioning a blowout preventer about a tubular, the blowout preventer having a plurality of rams slidably positionable therein and a plurality of blades carried by the plurality of rams for engaging the tubular;
- and
- advancing the plurality of blades through the tubular by piercing the tubular with a piercing point of at least one of the plurality of blades such that a portion of the tubular is dislodged therefrom and raking through the tubular with a cutting surface of at least one of the plurality of blades until the tubular is severed.
Dependencies are inferred from the claim text.