| 发明名称 |
Providing electrical isolation for a downhole device |
| 摘要 |
An isolation apparatus is provided between an electrical conductor and an electrically-activated well tool. The isolation apparatus has a blocking element to enable a signal having a first electrical polarity to pass through the element. The blocking element blocks a signal having a second electrical polarity. |
| 申请公布号 |
GB2395502(B) |
申请公布日期 |
2004.10.20 |
| 申请号 |
GB20030027036 |
申请日期 |
2003.11.20 |
| 申请人 |
* SCHLUMBERGER HOLDINGS LIMITED |
发明人 |
NOLAN C * LERCHE;JAMES E * BROOKS;CHOON FEI * WONG |
| 分类号 |
E21B17/00;E21B43/119;E21B47/12;(IPC1-7):E21B43/11;E21B43/118 |
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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