Outburst coal seam circumferential flow supply shield pressure relief screen hole spiral drill rod

• Main Authors: SUN YUNING, DING LIPEI, SUN ZHIDONG, SONG WEIBIN, WANG ZHIMING, SUN XUHUI
• Format: Patent
• Language: Chinese; English
• Published: 07.12.2021
• 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 discloses an outburst coal seam circumferential flow supply shield pressure relief screen hole spiral drill rod. The outburst coal seam circumferential flow supply shield pressure relief screen hole spiral drill rod comprises an outer pipe and an inner pipe, a flow supply channel is formed between the outer pipe and the inner pipe, an inner slag discharge channel is formed in the center of the inner pipe, a spiral groove is formed in the outer surface of the outer pipe, slag discharge screen holes are formed in the spiral groove, inner screen holes correspondingly communicate with the slag discharge screen holes are formed in the inner pipe, and the slag discharge screen holes are matched with the inner screen holes to realize communication with the inner slag discharge channel; and cylindrical protrusions or large-pitch spiral protruding ribs which are provided with inner screen holes and are distributed in a spiral mode are arranged on the outer surface of the inner pipe. The outburst coal sea