| 发明名称 |
PROCESS AND DRILLING EQUIPMENT FOR SINKING A WELL IN UNDERGROUND ROCK FORMATIONS |
| 摘要 |
The present invention is a drilling tool including a telescoping assembly gor transmitting hydraulic force to the drill bit at the bottom of the tool. The internal hydraulic characteristics of the tool may be varied to vary the force through extension and retraction of the telescoping assembly.
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| 申请公布号 |
CA2047555(C) |
申请公布日期 |
2002.03.26 |
| 申请号 |
CA19912047555 |
申请日期 |
1991.07.22 |
| 申请人 |
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发明人 |
JUERGENS, RAINER;MAKOHL, FRIEDHELM |
| 分类号 |
E21B7/06;E21B17/07;E21B21/08;E21B44/00;(IPC1-7):E21B7/20 |
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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