发明名称 |
Improvements in or relating to down-hole tools |
摘要 |
<p>A time delay mechanism wherein there is provided a time delay between the application of a pressure to the mechanism and an action being carried out as a result of the application of said pressure. The mechanism may comprise a first piston and piston chamber and a second piston and piston chamber. Communication of a viscous fluid between said piston chambers may be achieved by means of at least one contoured flow passage.</p> |
申请公布号 |
GB2289488(B) |
申请公布日期 |
1998.02.18 |
申请号 |
GB19950010189 |
申请日期 |
1995.05.19 |
申请人 |
* PETROLEUM ENGINEERING SERVICES LIMITED |
发明人 |
GEORGE * MAITLAND |
分类号 |
E21B34/10;(IPC1-7):E21B34/10 |
主分类号 |
E21B34/10 |
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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