Gas extraction tube drilling feeding method

• Main Authors: LI HUI, LI CHAO, LIU JUAN, XIAO YUNTAO, ZHOU FEI, YUE ZHIQI, WANG XINWEI
• Format: Patent
• Language: Chinese; English
• Published: 23.07.2014
• 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; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention discloses a gas extraction tube drilling feeding method. A hollow PVC drill pipe carrying a PVC drill bit to drill to the deep position of a coal seam, then, hole sealing processing is carried out on the PVC drill pipe, and finally the tail end of the PVC drill pipe is connected to a gas extraction device in a sealed mode so that gas drainage operation can be carried out. According to the gas extraction tube drilling feeding method, the PVC drill pipe and the PVC drill bit serve as disposable drilling tools, and also have the gas drainage function, the gas drainage working procedure is simplified, and the hole collapse of drilled holes in the drill withdrawal process can be avoided; even though hole collapse occasionally happens due to the drilling process, the PVC drill pipe and the PVC drill bit cannot hinder extraction, and the extraction progress is not influenced; it is clear that the gas extraction tube drilling feeding method is easy and convenient to operate, high in efficiency and good