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发明名称
STOPFEN ZUR VERWENDUNG IN BOHRLOECHERN.
摘要
申请公布号
DE3777020(D1)
申请公布日期
1992.04.09
申请号
DE19873777020
申请日期
1987.09.04
申请人
WEATHERFORD U.S. INC., HOUSTON, TEX., US
发明人
SCHNEIDER, DAVID E., HOUSTON TEXAS 77077, US
分类号
E21B23/10;E21B27/00;E21B29/00;E21B33/126;E21B33/16;(IPC1-7):E21B23/10;E21B33/127
主分类号
E21B23/10
代理机构
代理人
主权项
地址
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