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...

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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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Beschreibung
Zusammenfassung:	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 spring (3) is arranged between the primary valve core (2) and the secondary valve core (9), and a secondary spring (8) is arranged between the secondary valve core (9) and a valve seat (10). The secondary spring (8) has a rigidity greater than that of the primary spring (3), an inner bypass hole is provided on the primary valve core (2), and an outer bypass hole is provided on the valve body (1). The bypass valve allows the screw drilling tool to cycle and drill forward with a larger displacement, which helps to improve the rock carrying efficiency of large-sized well sections, high-angle well sections and horizontal sections, reduce drilling risks and increase drilling speed. L'invention concerne une vanne de dérivatio