| 发明名称 |
INTERMEDIATE WEIGHT DRILL STRING MEMBER |
| 摘要 |
An improved intermediate weight member to be put in a drill string between the collars and the drill pipe which has a spiraled outer surface, and which is so configured as to provide a uniform bending moment of inertia over its length including the slip area. |
| 申请公布号 |
GB2087950(B) |
申请公布日期 |
1984.08.22 |
| 申请号 |
GB19810018011 |
申请日期 |
1981.06.11 |
| 申请人 |
GRACE NATURAL RESOURCES CORP |
发明人 |
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| 分类号 |
E21B17/00;E21B17/16;E21B17/22;(IPC1-7):21B17/22 |
主分类号 |
E21B17/00 |
| 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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