| 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 |
US2014196956(A1) |
申请公布日期 |
2014.07.17 |
| 申请号 |
US201414212404 |
申请日期 |
2014.03.14 |
| 申请人 |
Smith International, Inc. |
发明人 |
Centala Prabhakaran K.;Zhang Zhehua |
| 分类号 |
E21B10/22 |
主分类号 |
E21B10/22 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A drill bit, comprising:
a bit body, comprising:
at the upper end of the bit body, a connection adapted to connect to a drill string; andat the lower end of the bit body, a plurality of journals extending downwardly and radially outward from a longitudinal axis of the bit; a plurality of roller cones rotatably mounted on the plurality of journals, wherein a ratio of a distance from the longitudinal axis to a greatest diameter of the cone and a bit radius is in a range of 0 to 0.25. |
| 地址 |
Houston TX US |
