发明名称 |
Filter assembly having a bypass passageway |
摘要 |
A filter assembly including a primary flow passageway having at least one filter deployed therein and a secondary flow passageway having a bypass filter deployed therein is provided. The filter assembly further includes a bypass valve assembly configured to selectively open and close the secondary flow passageway when a fluid pressure is respectively above and below an adjustable, predetermined threshold value. Exemplary embodiments of this invention may be coupled to a drill string and advantageously utilized to filter drilling fluid downhole. Such embodiments tend to advantageously improve the filtering efficiency and safety of drilling operations.
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申请公布号 |
US2005121233(A1) |
申请公布日期 |
2005.06.09 |
申请号 |
US20040984466 |
申请日期 |
2004.11.09 |
申请人 |
PATHFINDER ENERGY SERVICES, INC. |
发明人 |
FRITH TERRENCE G. |
分类号 |
E21B21/00;(IPC1-7):E21B43/34 |
主分类号 |
E21B21/00 |
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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