| 发明名称 |
DUAL MOTOR SYSTEMS AND NON-ROTATING SENSORS FOR USE IN DEVELOPING WELLBORES IN SUBSURFACE FORMATIONS |
| 摘要 |
A method for forming a subsurface wellbore is disclosed. The method includes operating a drilling string in a first direction of rotation. A first motor located near the end of the drilling string is operated in a direction of rotation opposite that of the drilling string. A drill bit is rotated using a second motor that is coupled to the first motor.
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| 申请公布号 |
US2009272578(A1) |
申请公布日期 |
2009.11.05 |
| 申请号 |
US20090422084 |
申请日期 |
2009.04.10 |
| 申请人 |
MACDONALD DUNCAN CHARLES |
发明人 |
MACDONALD DUNCAN CHARLES |
| 分类号 |
E21B4/20;E21B4/16;E21B7/00;E21B7/06;E21B44/00;E21B47/00 |
主分类号 |
E21B4/20 |
| 代理机构 |
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代理人 |
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