SCREW DRILLING TOOL BY-PASS VALVE WITH LARGE DISPLACEMENT SPLITTING FUNCTION AND USING METHOD THEREOF

Provided are a screw drilling tool by-pass valve with large displacement splitting function and a using method thereof. The screw drilling tool bypass valve comprises a valve body (1), and a primary valve core (2) and a secondary valve core (9) are arranged inside the valve body (1). A primary sprin...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	MIAO, Zaiqiang, FAN, Zhibin, YANG, Weixing, LIU, Yongwang, FU, Chenglin, GUAN, Zhichuan, TENG, Zhixiang, SHI, Yucai
Format:	Patent
Sprache:	chi ; eng ; fre
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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