| 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.
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| 申请公布号 |
US4460202(A) |
申请公布日期 |
1984.07.17 |
| 申请号 |
US19800210479 |
申请日期 |
1980.11.26 |
| 申请人 |
CHANCE, GLENN G.;KOVENSKY, WILLIAM |
发明人 |
CHANCE, GLENN G.;KOVENSKY, WILLIAM |
| 分类号 |
E21B17/00;E21B17/16;E21B17/22;(IPC1-7):F16L25/00 |
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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