Blowout preventer blade assembly and method of using same

摘要

Techniques for shearing a tubular of a wellbore penetrating a subterranean formation with a blowout preventer are provided. The blowout preventer has a housing with a hole therethrough for receiving the tubular. The techniques relate to a blade assembly including a ram block movable between a non-engagement position and an engagement position about the tubular, a blade carried by the ram block for cuttingly engaging the tubular, and a retractable guide carried by the ram block and slidably movable therealong. The restractable guide has a guide surface for urging the tubular into a desired location in the blowout preventer as the ram block moves to the engagement position.

主权项

1. A blade assembly of a blowout preventer for shearing a tubular of a wellbore penetrating a subterranean formation, the blowout preventer having a housing with a hole therethrough to receive the tubular, the blade assembly comprising:
a ram block movable between a non-engagement position and an engagement position about the tubular; a blade carried by the ram block to cuttingly engage the tubular; and a retractable guide carried by the ram block and slidably movable therealong, the retractable guide having a guide surface to urge the tubular into a desired location in the blowout preventer as the ram block moves to the engagement position; wherein the guide surface is concave with an apex along a central portion thereof and wherein the blade has a puncture point extendable beyond the apex.