Hole protecting and sealing method for gas extraction drill hole with one hole and one hole

• Main Authors: MA KAI, YI ENBING, GAO ZHENYONG, GONG GUOMIN, YUAN DEQUAN, CHEN BIN, HAO GUANGSHENG, SHI, ROBERT, YONGTAO, JIA LIMING, WANG SHIWEI, WANG YIFAN, YANG LIPING, MA QIANQIAN, MOU QIAN
• Format: Patent
• Language: Chinese; English
• Published: 07.03.2023
• 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; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention relates to a hole protecting and sealing method for a gas extraction drill hole in a one-hole one-strategy mode, and belongs to the field of gas control. The method mainly comprises the following steps that firstly, in the drill withdrawal process of a drill bit provided with a signal collecting and transmitting device, stress and strain parameters of hole wall surrounding rock in a drill hole and other parameters reflecting the shape of the hole wall of the drill hole are fed back in real time; a digital signal-image conversion technology is used for forming a drilling hole-forming visual image including drilling hole wall integrity, drilling hole instability collapse distribution and the like, and the position of a drilling hole plugging section baffle, the position and the length of a grouting section, the length of a plugging section and the position and the length of a lower screen pipe are automatically designed according to the image; and secondly, targeted hole protection and hole sealin