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发明名称
AUFWEITBOHRKOPF MIT VERBESSERTE STABILITÄT UND ÜBERGANG VON DER PILOTBOHRUNG ZUR VERGRÖSSERTEN BOHRUNG
摘要
申请公布号
DE69735096(D1)
申请公布日期
2006.04.06
申请号
DE19976035096
申请日期
1997.10.08
申请人
BAKER HUGHES INC., HOUSTON
发明人
DOSTER, L.;PESSIER, C.;SCHNELL, M.;MCDONALD, T.
分类号
E21B10/26;E21B7/04;E21B7/06;E21B7/28;E21B17/10
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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