Patent ID: 8602102

Claim:
A blade for severing a tubular of a wellbore, the wellbore having a blowout preventer with a bore therethrough for receiving the tubular and a guideway therein in communication with the bore, the blade comprising: a blade body slidably positionable in the guideway of the blowout preventer and movable toward and away from the bore of the blowout preventer, the blade body comprising: a cutting surface on an edge thereof that faces the bore when the blade body is positioned in the guideway; a plurality of inclined recesses extending into at least a portion of the blade body away from the bore when the blade body is positioned in the guideway, at least a portion of the plurality of inclined recesses being linear; and at least one projection between the plurality of inclined recesses for piercing the tubular; wherein the blade body is movably positionable through at least a portion of the tubular such that the at least one projection first pierces the tubular and then at least a portion of the plurality of inclined recesses engage the tubular.