Device for alternately injecting liquid and gas into wellhead

The utility model discloses a wellhead device for alternately injecting liquid into gas. The wellhead device comprises a lower four-way connector, an upper four-way connector, a first annulus valve assembly, a second annulus valve assembly, a connecting valve assembly, a liquid injection valve assem...

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Bibliographische Detailangaben
Hauptverfasser:	LIANG FENG, SHI HAIPING, SONG ZEWU, HAN SHAOQIN, XIE CHENGLONG, ZHANG WEI
Format:	Patent
Sprache:	chi ; eng
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:	The utility model discloses a wellhead device for alternately injecting liquid into gas. The wellhead device comprises a lower four-way connector, an upper four-way connector, a first annulus valve assembly, a second annulus valve assembly, a connecting valve assembly, a liquid injection valve assembly, a gas injection valve assembly and a detection valve. An upper connector of the lower four-way connector is fixedly connected with the lower end of the connecting valve assembly, a left connector is fixedly connected with one end of the first annulus valve assembly, a right connector is connected with one end of the second annulus valve assembly, and an oil pipe hanger is connected into the lower four-way connector in a sealed mode; the upper end of the connecting valve assembly is fixedly connected with the lower connector of the upper four-way connector; an upper connector of the upper four-way connector is fixedly connected with the lower end of the detection valve, a left connector is fixedly connected wit