| 发明名称 |
IMPROVED DRILLING METHOD AND APPARATUS |
| 摘要 |
A retrievable or fixed wedging assembly for steering or branching a borehole is provided in which the assembly is locked in position by means of an annular locking means which engage about the wall of the borehole at the desired position. |
| 申请公布号 |
AU8203287(A) |
申请公布日期 |
1988.04.14 |
| 申请号 |
AU19870082032 |
申请日期 |
1987.12.02 |
| 申请人 |
ENCORE DRILLING LTD., |
发明人 |
NAME NOT GIVEN |
| 分类号 |
E21B7/06;E21B7/08;E21B47/022;E21B47/024;E21B47/18 |
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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