초록 ▼

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 ha

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.

대표청구항 ▼

What is claimed is: 1. A blade for severing a tubular of a wellbore, the tubular positionable in a blowout preventer, the blade comprising:a blade body movable toward and away from the tubular by a ram of the blowout preventer, the blade body comprising:a cutting surface on front face of the blade b

What is claimed is: 1. A blade for severing a tubular of a wellbore, the tubular positionable in a blowout preventer, the blade comprising:a blade body movable toward and away from the tubular by a ram of the blowout preventer, the blade body comprising:a cutting surface on front face of the blade body that faces the tubular, the cutting surface comprising a plurality of portions and at least one inclined face, at least one of the plurality of portions being linear; andat least one projection extending a distance from the front face toward the tubular, the at least one projection having a tip positioned between the plurality of portions of the cutting surface;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 the cutting surface passes through the tubular such that the at least one of the plurality of linear portions engages the tubular whereby the entire tubular is severed.