Abstract: Methods and apparatuses for severing a wellbore tubular, the apparatus, in certain aspects, including: a first member movable toward a tubular to be severed; a second member with a second blade disposed opposite to the first member and movable toward the tubular; a first blade on the first member having a projection projecting from a center of a blade body with point structure on the projection for puncturing the tubular and cutting surfaces on the projection for cutting the tubular; and cutting surfaces, as needed, on the blade body adjacent the projection for cutting the tubular.
Type:
Grant
Filed:
May 5, 2008
Date of Patent:
October 19, 2010
Assignee:
National Oilwell Varoo, L.P.
Inventors:
Frank Benjamin Springett, James D. Brugman