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发明名称
Lubricating washpipe system and method
摘要
The invention relates to washpipes for use in drilling operations such as drilling for oil and gas, and more particularly to an auto lubricating washpipe and liner system and method.
申请公布号
US8225858(B2)
申请公布日期
2012.07.24
申请号
US20090587146
申请日期
2009.10.02
申请人
MARTIN WILLIAM D.
发明人
MARTIN WILLIAM D.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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