Generation of cutting heat and simulation of coring tube wall temperature during coring in primary structure coal seam

Abstract

When the drilling core method is used to determine the coalbed gas content, the cutting heat generated by the coring bit cutting coal will increase the coring tube temperature, and the excessively high coring tube temperature will have an heating effect on the coal core, which will accelerate the coal core gas desorption rate and increase the gas loss amount. The generation of cutting heat of coring bit and the measurement of coring tube temperature are the basis for grasping the gas desorption law of coal core and projecting the amount of gas loss. Firstly, the self-developed coring tube temperature measurement device was used to conduct on-site coring temperature measurement experiments at different cutting speeds. Then, the cutting temperature of coring bit was solved by establishing thermodynamic model for cutting coal and heat transfer model of cutting edge. Finally, based on the thermal conductivity characteristics of the coring tube, the coring tube temperature at different cutting speeds was simulated, and the simulated temperature was compared with the on-site measured temperature to verify the reliability of the model. The results show that when coring in primary structural coal, the temperature change trend of coring tube wall temperature measurement point at different cutting speeds is basically consistent, the temperature measurement point at the front end of the coring tube mainly goes through a relatively stable period in the drilling process, a sharp rising period in the cutting process, a slow rise and cooling period in the withdrawal process. However, the temperature measurement point at the back end of the coring tube wall mainly goes through a relatively stable phase and a slowly increasing phase. The temperature rise of the coring bit and the coring tube wall are significantly positively correlated with the cutting speed. When coring in hard coal seam and the coring depth is not large, the cutting heat generated by the coring bit and the coal body is the dominant factor for the temperature rise of the coring tube. The coring tube wall temperature calculated using the model matches well with the field measured temperature, and the error is small, which fully shows that the coring thermodynamic model is feasible. This study provides a basis for further research on the dynamic distribution characteristic of coal core temperature during coring, which is of profound significance to calculate the gas loss and coalbed gas content.