| 发明名称 |
DRILLING PIPE FOR MAKING A DRILL STRING |
| 摘要 |
Drilling pipe for making a drill string, in particular adapted for deviation drilling. In order to achieve a small adhesion against the wall of the hole being drilled said drilling pipe comprises a substantially helical tube (1) having a head (2, 3) at each end. |
| 申请公布号 |
WO8604951(A1) |
申请公布日期 |
1986.08.28 |
| 申请号 |
WO1986NO00020 |
申请日期 |
1986.02.21 |
| 申请人 |
A/S RAUFOSS AMMUNISJONSFABRIKKER |
发明人 |
NARUM, HENNING;SANGESLAND, SIGBJOERN |
| 分类号 |
E21B7/04;E21B17/00;E21B17/22;(IPC1-7):E21B17/22 |
主分类号 |
E21B7/04 |
| 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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