Blowout preventers and methods of use

  • US 7,814,979 B2
  • Filed: 05/05/2008
  • Issued: 10/19/2010
  • Est. Priority Date: 04/25/2006
  • Status: Active Grant
First Claim
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1. A method for severing a tubular, the tubular useful for wellbore operations, the method comprisinginserting a portion of a tubular into a tubular severing apparatus comprising a first member movable toward the tubular, a second member movable toward the tubular, the second member disposed opposite the first member, a first blade on the first member, the first blade comprising a first blade body, a first point structure on the first blade body for contacting and puncturing the tubular, first cutting surfaces on the first blade body spaced-apart and adjacent the first point structure and for cutting the tubular, the first point structure projecting sufficiently from the first blade body so that the first point structure can contact the tubular and puncture the tubular before the first cutting surfaces of the first blade body cut the tubular, and a second blade on the second member, the second blade comprising a second blade body, a second point structure on the second blade body for contacting and puncturing the tubular, second cutting surfaces on the second blade body spaced-apart and adjacent the second point structure and for cutting the tubular, the second point structure projecting sufficiently from the second blade body so that the second point structure can contact the tubular and puncture the tubular before the second cutting surfaces of the second blade body cut the tubular,moving the first blade toward the tubular to bring the first point structure into contact with an outer surface of the tubular,moving the first blade so that the first point structure punctures into the tubular and goes through the tubular,moving the second blade toward the tubular to bring the second point structure into contact with an outer surface of the tubular,moving the second blade so that the second point structure punctures into the tubular and goes through the tubular,wherein each of the two point structures contact the tubular substantially simultaneously and puncture the tubular substantially simultaneously,following puncturing of the tubular by the point structures, pushing apart portions of the tubular adjacent each point structure as the point structures move toward each other,following puncturing of the tubular by both point structures, moving the first blade and the second blade to sever the tubular with the first and second cutting surfaces,wherein each point structure has a point and each point passes completely through the tubular prior to complete severing of the tubular.

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