Directional fracturing equipment, roof cutting entry retaining method and coal seam extraction drilling permeability increasing method

• Main Authors: LI KEXIANG, SHENG ZHUWEN, JI XIAOHU, WANG BINGSHAN, ZHAO DONGFANG, CHEN LEI, LEE YOUNG-WON, LI WEI, SUN JING, CHEN CUNQIANG, MA MINGKAI, LI LEI, TAN JIAGUI, ZHANG MAOYUAN, GUO JIANZHONG
• Format: Patent
• Language: Chinese; English
• Published: 14.03.2023
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; MINING OR QUARRYING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

The invention relates to the technical field of coal mining equipment, in particular to directional fracturing equipment, a top cutting entry retaining method and a coal seam extraction drilling permeability increasing method. The directional fracturing equipment comprises a rod body and a piston; a nozzle is arranged at the side part of the rod body, a jet channel is formed in the rod body, one end of the jet channel is communicated with the nozzle, and the other end of the jet channel is used for injecting high-pressure fluid; the piston is installed on the rod body, and the central axis of the piston and the central axis of the nozzle form an included angle. The directional fracturing equipment is applied to the roof cutting entry retaining method and the coal seam extraction drilling permeability increasing method. According to the directional fracturing equipment, the roof cutting entry retaining method and the coal seam extraction drilling anti-reflection method, the pressure needed by drilling splittin