发明名称 |
Multi-seal for top drive shaft |
摘要 |
A multi-seal sealing assembly with multiple seals so that when one seal wears out another can be moved into sealing position; and a top drive system for wellbore operations with such a sealing assembly; the sealing assembly in one aspect having a seal carrier movable to move at least one secondary seal into sealing position when a primary seal has worn out.
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申请公布号 |
US2007251705(A1) |
申请公布日期 |
2007.11.01 |
申请号 |
US20060414514 |
申请日期 |
2006.04.28 |
申请人 |
WELLS LAWRENCE E;STUBSTAD SVEIN;ERVIN HOWARD;BRUGMAN JAMES D;CONOVER PAUL |
发明人 |
WELLS LAWRENCE E.;STUBSTAD SVEIN;ERVIN HOWARD;BRUGMAN JAMES D.;CONOVER PAUL |
分类号 |
E21B19/00 |
主分类号 |
E21B19/00 |
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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