METHOD AND APPARATUS FOR REDUCING THE DIFFERENTIAL PRESSURE STICKING TENDENCY OF A DRILL STRING,申请号GB19820000375-传众专利搜索

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发明名称	METHOD AND APPARATUS FOR REDUCING THE DIFFERENTIAL PRESSURE STICKING TENDENCY OF A DRILL STRING
摘要
申请公布号	GB2090891(B)	申请公布日期	1985.01.30
申请号	GB19820000375	申请日期	1982.01.07
申请人	MOBIL OIL CORP	发明人
分类号	E21B7/04;E21B17/00;E21B17/04;E21B17/10;E21B21/00;E21B31/00;E21B31/03;(IPC1-7):E21B7/04	主分类号	E21B7/04
代理机构		代理人
主权项
地址

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