| 发明名称 |
Plug for use in wellbore operations. |
| 摘要 |
<p>A plug for use in wellbore operations comprises a first contoured wiper surface (15) and a second contoured wiper surface (16) which is inverted with respect to the first contoured surface (15). </p> |
| 申请公布号 |
EP0225145(A2) |
申请公布日期 |
1987.06.10 |
| 申请号 |
EP19860309145 |
申请日期 |
1986.11.24 |
| 申请人 |
WEATHERFORD U.S. INC. |
发明人 |
SCHNEIDER, DAVID E. |
| 分类号 |
E21B23/10;E21B33/126;E21B33/16;(IPC1-7):E21B23/10 |
主分类号 |
E21B23/10 |
| 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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