METHOD AND APPARATUS FOR CONTROLLING DRILLING FLUID CIRCULATION DURING THE BIT REPLACEMENT RUN,申请号RO19850121001-传众专利搜索

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发明名称	METHOD AND APPARATUS FOR CONTROLLING DRILLING FLUID CIRCULATION DURING THE BIT REPLACEMENT RUN
摘要
申请公布号	RO94396(B1)	申请公布日期	1988.05.31
申请号	RO19850121001	申请日期	1985.12.03
申请人	INSTITUTUL DE CERCETARI SI PROIECTARI PENTRU PETROL SI GAZE	发明人	TUTUIANU GHEORGHE;SCHIOPU ION
分类号	E21B47/04	主分类号	E21B47/04
代理机构		代理人
主权项
地址

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