Design of large diameter cooling pipe well drilling with a length of nearly one kilometer through a strong and thick aquifer
Refrigeration and cooling are effective technical means for preventing and controlling thermal hazards in deep mines.During the construction of the refrigeration and cooling system in the Hetaoyu Mine,there were several technical difficulties need to be solved,such as deep drilling of the cooling pipe well,passing through the thick and strong aquifer of the Luohe Formation,and long-distance transportation of refrigerant for cooling.Based on the analysis of engineering and hydrogeological conditions,the design parameters for the two-stage opening and segmentation of the pipe well drilling were determined.After conducting a research on the performance of pipeline cold insulation materials,a design scheme was proposed for the protective wall pipe in the bedrock section under four cold insulation methods:composite steel pipe,static air,glass microsphere reinforced cement,and steel-based composite thermal insulation casing.After comprehensively considering the factors such as cold insulation effect,cementing reliability,and construction difficulty,the steel-based composite thermal insulation casing was preferred as the working pipe.According to the force calculation of the casing,the specifications and parameters of the protective wall pipe were verified.According to the implementation effect of the project,the temperature loss at the beginning and end of the cooling pipe is about 1℃,which can meet the requirements of cooling capacity loss for long-distance transportation of refrigerant,and has promotion and application value for similar projects.
pipe well drillingnearly one kilometer drillingstrong and thick aquifersteel-based composite insulation casing
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