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发明名称
DRILLING SYSTEM WITH DRILL STRING VALVES
摘要
申请公布号
EP2279325(A2)
申请公布日期
2011.02.02
申请号
EP20090739380
申请日期
2009.04.02
申请人
SCHLUMBERGER TECHNOLOGY B.V.;PRAD RESEARCH AND DEVELOPMENT LTD;SERVICES PETROLIERS SCHLUMBERGER;SCHLUMBERGER HOLDINGS LIMITED
发明人
DOLMAN, LEE, F.;JEFFRYES, BENJAMIN, P.;JOHNSON, ASHLEY, B.;CLARK, BRIAN;MCCULLAGH, JOHN, A.
分类号
E21B34/08;E21B47/12
主分类号
E21B34/08
代理机构
代理人
主权项
地址
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