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发明名称
WELL DEVICE WITH ANNULUS CHECK VALVE AND HYDRAULIC BY-PASS
摘要
申请公布号
GB2108551(B)
申请公布日期
1985.01.23
申请号
GB19820022081
申请日期
1982.07.30
申请人
* ARMCO INC
发明人
JOHN E * LAWSON
分类号
E21B33/04;E21B33/047;E21B34/02;E21B34/16;(IPC1-7):E21B34/02
主分类号
E21B33/04
代理机构
代理人
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