发明名称 |
Single cone rock bit having inserts adapted to maintain hole gage during drilling |
摘要 |
A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string. A bearing journal depends from the bit body. A single roller cone is rotatably attached to the bearing journal. The roller cone has a plurality of inserts disposed at selected positions about the cone. The journal defines a rotation angle with respect to an axis of rotation of the bit such that the roller cone includes a wall contact zone and a bottom contact zone. At least one of the inserts disposed in the wall contact zone has an extension portion terminating in a substantially planar upper surface.
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申请公布号 |
US7690446(B2) |
申请公布日期 |
2010.04.06 |
申请号 |
US20080027194 |
申请日期 |
2008.02.06 |
申请人 |
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发明人 |
WITMAN GEORGE B.;WILSON PETER;MCDONOUGH SCOTT D.;SIRACKI MICHAEL A. |
分类号 |
E21B10/16 |
主分类号 |
E21B10/16 |
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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