Fixed-point reaming permeability-increasing and hole-sealing pre-pumping method for first mining layer of coal seam group

• Main Authors: CHEN YONG, WANG DALONG, KANG JIANNING, WANG LONGWEN, WU BIN, ZHAO QINGWEI, LI YONGYUAN, WANG BINGSHAN, LEE KEUK-SANG, ZHOU WENBIN, LIU ZIBING, JIANG QI, WANG CHUNGENG, SUN FULONG, TANG BAOZHONG, ZHAO QINGQUAN, MA MINGKAI, QIN TIANLONG, CHEN LIANGFA, YANG JIE, TAN JIAGUI, GUO JIANZHONG
• Format: Patent
• Language: Chinese; English
• Published: 05.05.2023
• 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

The invention relates to a fixed-point reaming permeability-increasing and hole-sealing pre-drainage method for a first mining layer of a coal seam group, and belongs to the field of gas control engineering. Comprising the following steps: performing pore-forming construction and parameter recording in a period of sequentially penetrating through a plurality of coal seams; determining the coal seeing length and the coal hole section length of the first mining key coal seam according to the drilling parameters and an imager; drilling to the coal seeing length of the first mining key coal seam, utilizing water pressure to burst through coal seam cutting teeth of a reamer bit, continuously drilling to achieve reaming and hole digging, and completing reaming and hole digging of the first mining key coal seam; collecting and recording the coal output in the hole; an extraction pipe and a hole sealing device are arranged in the hole; after hole sealing, gas extraction parameters of the first-mining key coal seam ar