发明名称 |
HIGH SHEAR ROLLER CONE DRILL BITS |
摘要 |
A drill bit may include a bit body, comprising: at its upper end, a connection adapted to connect to a drill string; at its lower end, a plurality of journals extending downwardly and radially outward from a longitudinal axis of the bit; a plurality of roller cones rotatable mounted on the plurality of journals; and at least three rows of cutting elements disposed on each of the plurality of roller cones, wherein an outermost row has an extension height to diameter ratio greater than a mid row, and the mid has an extension height to diameter ratio greater than an innermost row. |
申请公布号 |
WO2011014590(A3) |
申请公布日期 |
2011.04.28 |
申请号 |
WO2010US43603 |
申请日期 |
2010.07.29 |
申请人 |
SMITH INTERNATIONAL, INC.;CENTALA, PRABHAKARAN, K.;ZHANG, ZHEHUA |
发明人 |
CENTALA, PRABHAKARAN, K.;ZHANG, ZHEHUA |
分类号 |
E21B10/08;E21B10/18;E21B10/50 |
主分类号 |
E21B10/08 |
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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