METHOD AND APPARATUS FOR FACILITATING CONTINUOUS CIRCULATION OF DRILLING MUD DURING CONSTRUCTION AND MAINTENANCE OF A WELL,申请号EP20090703464-传众专利搜索

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发明名称	METHOD AND APPARATUS FOR FACILITATING CONTINUOUS CIRCULATION OF DRILLING MUD DURING CONSTRUCTION AND MAINTENANCE OF A WELL
摘要
申请公布号	EP2232001(B1)	申请公布日期	2012.11.21
申请号	EP20090703464	申请日期	2009.01.21
申请人	NATIONAL OILWELL VARCO, L.P.	发明人	SPRINGETT, FRANK BENJAMIN
分类号	E21B19/16;E21B21/01	主分类号	E21B19/16
代理机构		代理人
主权项
地址

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