发明名称 |
Top drive with shaft seal isolation |
摘要 |
A top drive system for wellbore drilling operations, the top drive system including a main shaft having an upper shaft seal system with a raised platform for supporting the seal system. The top drive may also have a shroud for covering the seal(s), and contaminants may flow down from the seals, since the seals are raised by the platform.
|
申请公布号 |
US7748445(B2) |
申请公布日期 |
2010.07.06 |
申请号 |
US20070001484 |
申请日期 |
2007.12.11 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
WELLS LAWRENCE EDWARD;FOX PRESTON R.;YENZER DARRIN LYNN |
分类号 |
E21B19/22 |
主分类号 |
E21B19/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|