Gas injection displacement reinforced gas extraction method

The invention relates to the technical field of coal seam gas extraction, and discloses a gas injection displacement reinforced gas extraction method which comprises the following steps: S1, constructing a fracturing hole and a gas injection hole in a coal seam; s2, a fracturing pipe and a gas injec...

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Bibliographische Detailangaben
Hauptverfasser:	XU BIN, LONG YONGHAN, LI XIANGWANG, LI SHOURUI, WANG GUANGHONG, OU CONG, XIE ZONGLIANG, WANG CHANGMING, ZHANG YAO, CHEN LIANG, WANG ZHENGSHUAI, ZHAO HUAJUN, LI WEN, HUANG XUCHAO, ZHAO KUN, HUANG SENLIN
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 invention relates to the technical field of coal seam gas extraction, and discloses a gas injection displacement reinforced gas extraction method which comprises the following steps: S1, constructing a fracturing hole and a gas injection hole in a coal seam; s2, a fracturing pipe and a gas injection pipe are connected into the fracturing hole and the gas injection hole correspondingly, and hole sealing treatment is conducted; s3, fracturing fluid is injected through the fracturing pipe, and hydraulic fracturing is conducted on the fracturing holes; s4, after fracturing is completed, gas is injected through a gas injection pipe, and fracturing fluid around the fracturing holes is discharged and collected through a fracturing pipe; and S5, after the fracturing fluid is collected, gas extraction is conducted through the fracturing pipe, and gas is injected into the gas injection hole through the gas injection pipe during extraction. According to the method, the influence of residual liquid in fractures after