| 发明名称 |
Circumferential centralizer |
| 摘要 |
Disclosed is a pumpdown tool for a well, the tool including a housing having a circumferentially extending seal on its outer surface and having a circumferential centralizer to protect the seal while the tool is being run in the well tubing.
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| 申请公布号 |
US4039027(A) |
申请公布日期 |
1977.08.02 |
| 申请号 |
US19760654520 |
申请日期 |
1976.02.02 |
| 申请人 |
OTIS ENGINEERING CORPORATION |
发明人 |
CHURCHMAN, RONALD K.;YONKER, JOHN H. |
| 分类号 |
E21B17/10;E21B23/10;(IPC1-7):E21B41/00 |
主分类号 |
E21B17/10 |
| 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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