Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a well,申请号US19900538634-传众专利搜索

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发明名称	Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a well
摘要
申请公布号	US5038871(A)	申请公布日期	1991.08.13
申请号	US19900538634	申请日期	1990.06.13
申请人	NATIONAL-OILWELL	发明人	DINSDALE, MICHAEL C.
分类号	E21B3/02;E21B15/00;E21B19/00;E21B19/02	主分类号	E21B3/02
代理机构		代理人
主权项
地址

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