Method for kilometer horizontal drilling, fracturing, roof cutting and pressure relief roadway protection and coal pillar width reduction

• Main Authors: GUO JUNQING, WANG HENG, FENG GUORUI, ZHANG BAISHENG, ZHANG SHIRUI, LIU PENGHUI, REN XIAOYANG, FENG TIANXIANG, XI ZETAO, LI HENGZHONG, LONG TENG
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; MINING OR QUARRYING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; SHAFTS; TUNNELS

The invention discloses a kilometer horizontal drilling fracturing roof cutting pressure relief roadway protecting and coal pillar width reducing method, which belongs to the field of coal mining, and has the technical key points that the method comprises the following steps: determining the magnitude and direction of the maximum principal stress and the minimum principal stress, determining the layer position and thickness of a hard rock layer which plays a key role in the pressure of a working surface, and determining the thickness of the hard rock layer; kilometer horizontal drilling parameters and hydraulic fracturing parameters are determined and designed by combining ground stress test results, uniaxial compressive strength, thickness and the like of a hard rock stratum. After the method is adopted, the load on the coal pillar is reduced, the coal recovery rate of the working face is improved, and the roadway convergence amount and maintenance amount are reduced. Compared with traditional vertical roadw