Abstract
In the process of coal rock drilling, the temperature change of cutting teeth of PDC drill bit significantly impacts both drilling performance and the service life of cutting teeth. By constructing a theoretical calculation model of the temperature rise of cutting teeth of PDC drill bit based on the heat-fluid-solid coupling effect, numerical simulation was carried out by using EDEM-FLUENT software. The temperature change of cutting teeth under the effect of heat-fluid-solid coupling was analyzed by numerical simulation. By adjusting the working parameters in the cutting model, the temperature rise behavior of cutting teeth under different weight of bit conditions was determined to verify the consistency between the theoretical model and simulation data. By building a coal rock drilling test platform, the PDC drill bit was tested under different weight of bit parameters. The analysis results show that the temperature of cutting teeth of the PDC drill bit increases when weight of bit increases from 1 to 4 kN. And the temperature is 441% higher than the original. When the weight of bit reaches 5 kN, the temperature increases by 49.64%. The use of pneumatic circulation can effectively reduce the temperature of the cutting teeth of the PDC drill bit. The higher the speed of pneumatic circulation, the more significant the effect of temperature reduction on the drill bit will be. The error values of the experimental results and the simulated and theoretical temperatures of the cutting teeth are within 10%. The model provides a theoretical basis for improving the PDC bit's service life and drilling efficiency during coal rock drilling with pneumatic drainage.
NETL
NSTL
Springer Nature