| 发明名称 |
DRILL MACHINE GUIDANCE USING NATURAL OCCURRING RADIATION |
| 摘要 |
<p>A method for guidance of a drilling apparatus along a desired path within a substantially horizontal coal seam, such method utilizing the natural radioactivity that is commonly present in mineral beds associated with coal deposits.</p> |
| 申请公布号 |
CA1112636(A) |
申请公布日期 |
1981.11.17 |
| 申请号 |
CA19790339070 |
申请日期 |
1979.11.02 |
| 申请人 |
CONTINENTAL OIL COMPANY |
发明人 |
DAHL, HILBERT D.;WILLIAMS, BILLY J.;SCHROEDER, RONDON L. |
| 分类号 |
E21B7/04;E21B7/06;E21B47/022;E21C35/08;(IPC1-7):21B7/04 |
主分类号 |
E21B7/04 |
| 代理机构 |
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代理人 |
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| 地址 |
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