| 发明名称 |
SAFETY VALVE FOR USE IN AN INJECTION WELL |
| 摘要 |
The present invention provides for a valve to allow injection of fluids into a well or other subterranean facility, but will close to prevent production or upward flow o f fluids through the valve upon halting injection operations.
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| 申请公布号 |
CA2533779(A1) |
申请公布日期 |
2006.07.24 |
| 申请号 |
CA20062533779 |
申请日期 |
2006.01.24 |
| 申请人 |
SCHLUMBERGER CANADA LIMITED |
发明人 |
MCCALVIN, DAVID E. |
| 分类号 |
E21B34/06;E21B21/10;E21B34/08 |
主分类号 |
E21B34/06 |
| 代理机构 |
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