发明名称 |
PRESSURE COMPENSATION AND ROTARY SEAL SYSTEM FOR MEASUREMENT WHILE DRILLING INSTRUMENTATION |
摘要 |
A pressure compensation system for a wellbore instrument coupled to a drill string includes a shaft rotatably mounted with respect to an instrument housing. A lubrication chamber included in the instrument has at least one bearing for rotatably supporting the shaft. The lubrication chamber includes a face seal coupled on one face to the shaft and on another face to the housing. A pressure compensator establishes hydraulic communication between the lubrication chamber and the interior of the drill string. The compensator includes a barrier to fluid movement between the lubrication chamber and the interior of the drill string. The barrier enables pressure communication therebetween. The compensator includes a pressure communication port extending between the barrier and a portion of the shaft exposed to the interior of the drill string. |
申请公布号 |
US2009133930(A1) |
申请公布日期 |
2009.05.28 |
申请号 |
US20070945542 |
申请日期 |
2007.11.27 |
申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
THORP RICHARD E.;EASON RAJU M.;BORSOS CHARLES |
分类号 |
E21B21/08 |
主分类号 |
E21B21/08 |
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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