<p>A method for severing a tubular of a wellbore is provided. The method involves positioning a blowout preventer about a tubular, the blowout preventer having a plurality of rams slidably positionable therein and a plurality of blades carried by the rams for engaging the tubular. The method further involves piercing the tubular with a piercing point of at least one of the blades such that a portion of the tubular is dislodged therefrom, and raking through the tubular with a cutting surface of at least one of the blades.</p>
申请公布号
CA2801800(C)
申请公布日期
2015.04.28
申请号
CA20112801800
申请日期
2011.05.27
申请人
NATIONAL OILWELL VARCO, L.P.
发明人
SPRINGETT, FRANK BENJAMIN;ENSLEY, ERIC TREVOR;JOHNSON, CHRISTOPHER DALE;PETERS, SHERN EUGENE