发明名称 |
Blowout preventers and methods of use |
摘要 |
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. |
申请公布号 |
US8066070(B2) |
申请公布日期 |
2011.11.29 |
申请号 |
US20100883469 |
申请日期 |
2010.09.16 |
申请人 |
SPRINGETT FRANK BENJAMIN;BRUGMAN JAMES DENNIS;NATIONAL OILWELL VARCO, L.P. |
发明人 |
SPRINGETT FRANK BENJAMIN;BRUGMAN JAMES DENNIS |
分类号 |
E21B29/08;B26D1/48;B26D3/16;E21B43/112 |
主分类号 |
E21B29/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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