Suspension installation method for protective casing pipe of pre-extraction ground well changed into mining well

• Main Authors: ZHANG YUMING, MA ZHENGHENG, ZHANG ZHAOYI, JIANG WANGANG, JIA QUANMIN, LIU WEN, FU JUNHUI, LIN FUJIN, WANG RAN, LI RIFU, WANG YAZHOU, YAO FENG, SUN RUI, ZHANG PENGCHONG, SUN PENG
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2021
• 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; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention relates to a suspension installation method for a protective casing pipe of a pre-extraction ground well changed into a mining well, and belongs to the technical field of coal mine gas extraction. The method comprises the steps that the specification of a well mouth casing pipe of the pre-extraction ground well is determined; the specification of the protective casing pipe is selected and determined; a suspension installation device is manufactured; a switching casing pipe is cut out from a casing pipe with the same specification as the well mouth casing pipe of the pre-extraction ground well, the switching casing pipe is provided with a thread which is matched with a thread at the connecting end of the well mouth casing pipe and can be in threaded connection with the thread, the protective casing pipe penetrates through the switching casing pipe, the thread at the connecting end of the protective casing pipe is exposed out of the switching casing pipe and fixedly connected with the opposite end