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发明名称
A downhole valve opening with reduced shock
摘要
申请公布号
GB2332006(A)
申请公布日期
1999.06.09
申请号
GB19980026797
申请日期
1998.12.04
申请人
* BAKER HUGHES INCORPORATED
发明人
DAVID E * HIRTH
分类号
E21B21/10;E21B34/14;(IPC1-7):E21B34/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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