发明名称 |
Inner gauge ring drill bit |
摘要 |
A drill bit comprises a plurality of annular blades coupled to a bit body. A plurality of gauge pads is coupled to the bit body and defines an outer cutting diameter. A circumferentially continuous gauge ring is coupled to the bit body and defines an inner cutting diameter. An inner cutting structure is coupled to the bit body and has a cutting diameter substantially equal to the inner cutting diameter. |
申请公布号 |
AU2013226327(A1) |
申请公布日期 |
2014.09.18 |
申请号 |
AU20130226327 |
申请日期 |
2013.02.22 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
SAUVAGEAU, RICHARD J. |
分类号 |
E21B10/04;E21B10/14;E21B10/48 |
主分类号 |
E21B10/04 |
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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