发明名称 |
Drill bit assembly for directional drilling |
摘要 |
In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion, the working portion having at least one cutting element. A shaft is supported by the body portion and extends beyond the working portion. The shaft also has a distal end that is rotationally isolated from the body portion. In another aspect of the invention, a method for steering a downhole tool string has the following steps: providing a drill bit assembly attached to an end of the tool string disposed within a bore hole; providing a shaft extending beyond a working portion of the assembly; engaging a subterranean formation with a distal end of the shaft; and angling the drill bit assembly with the shaft along a desired drilling trajectory.
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申请公布号 |
US7360610(B2) |
申请公布日期 |
2008.04.22 |
申请号 |
US20060306976 |
申请日期 |
2006.01.18 |
申请人 |
HALL DAVID R;LEANY FRANCIS E;DAHLGREN SCOTT;LUNDGREEN DAVID;WISE DARYL N |
发明人 |
HALL DAVID R.;LEANY FRANCIS E.;DAHLGREN SCOTT;LUNDGREEN DAVID;WISE DARYL N. |
分类号 |
E21B7/06 |
主分类号 |
E21B7/06 |
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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