Diversion pressure relief drill rod

• Main Authors: WANG BINGCHU, ZHANG YAFEI, WANG XIAO, SHI SHAOQIU, LIU YAPENG, YAO JIANXUN, YIN YONGQI, WANG JUNGANG
• Format: Patent
• Language: Chinese; English
• Published: 03.02.2023
• 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 flow guide and pressure relief drill rod comprises a drill rod assembly, the drill rod assembly comprises an outer pipe and an inner pipe, the inner pipe is coaxially sleeved with the outer pipe, a preset gap is formed between the outer pipe and the inner pipe, and the preset gap forms a driving cavity; the interior of the inner pipe is hollow and forms a pressure relief cavity, the exhaust port is formed in one end of the pressure relief cavity, the alternating-current connector is arranged at the end, away from the exhaust port, of the drill rod assembly, a first sub-runner and a pressure relief backflow port are formed in the alternating-current connector, the two ends of the first sub-runner communicate with the driving cavity, and the two ends of the pressure relief backflow port communicate with the pressure relief cavity and the exterior of the outer pipe correspondingly; in the drilling operation process of the coal seam, slurry flows through the driving cavity and the first branch flow channel, a