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发明名称
Circulation control device within a well bore
摘要
申请公布号
GB2391242(A)
申请公布日期
2004.02.04
申请号
GB20030022297
申请日期
2002.03.08
申请人
* VARCO I/P, INC
发明人
ROBERT M * NORRIS
分类号
E21B34/06;E21B34/08;E21B43/12;(IPC1-7):E21B43/12
主分类号
E21B34/06
代理机构
代理人
主权项
地址
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