Primary coal and tectonic coal composite coal bed gas fracturing mining method

• Main Authors: LIU WEI, ZHANG XIONG, WU ZHANGLI, GUO ZHIJUN, WEI YUANLONG, ZHAO LINGYUN, HAN ZHONGQIN, ZHOU PEIMING
• Format: Patent
• Language: Chinese; English
• Published: 05.07.2022
• Subjects: 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; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention provides a primary coal and tectonic coal composite coal bed gas fracturing mining method which comprises the steps that well drilling, casing running and fixing of horizontal wells are conducted on underlying stratums of an upper primary coal bed and a lower tectonic coal bed respectively, an upper horizontal well and a lower horizontal well are obtained, and the well drilling directions of the upper horizontal well and the lower horizontal well are opposite; clustering fracturing sections and perforation operation of the clustering fracturing sections are carried out on the upper horizontal well and the lower horizontal well, and the clustering fracturing sections of the upper horizontal well and the clustering fracturing sections of the lower horizontal well are arranged in a staggered mode; the lower horizontal well and the upper horizontal well are subjected to clustering fracturing construction, the upper horizontal well is used for gas production, and the lower horizontal well is used for