Analysis of wear factors and prediction model for disccutters in jurassic formation drilling in Western China

BAI Shuai; CHENG Hua; YAO Zhishu; WANG Xiaoyun; GUO Longhui; WANG Yiyang

doi:10.19458/j.cnki.cn11-2456/td.2026.01.012

Abstract：In response to the severe wear of cutting tools in drilling method shaft sinking through weak-ly cemented Jurassic strata in Western China,this study focuses on the mill-tooth roller bits commonly used in drilling method shaft sinking.The wear of mill-tooth roller bits was classified based on field measurement data.Tests were conducted on abrasive factors such as drilling rotation speed,rock com-pressive strength,tensile strength,hardness and mud viscosity,and the influence of these factors as well as installation radius on roller bit wear were analyzed.Through correlation analysis,the key fac-tors affecting the wear of mill-tooth roller bits were identified,and a predictive model for wear volume was established based on these key factors.The results show that the wear of mill-tooth roller bits can be classified into five levels:slight wear,moderate wear,intermediate wear,severe wear and complete failure.The wear volume of mill-tooth roller bits is positively correlated with rotation speed,installa-tion radius,rock compressive strength,rock hardness and rock tensile strength,but negatively correla-ted with mud viscosity.Based on the field data from the 10th and 11th trips out of the hole during the advanced drilling of the north ventilation shaft at the Taohutu Coal Mine in Ordos City in the western mining area,the accuracy of the prediction model for the average wear of milling cutters per bit was validated.The research findings can provide an effective theoretical reference for predicting the wear of milling cutters used in shaft sinking by the drilling method in the Jurassic weak-cemented rock forma-tions of the western mining area,as well as for similar cutters.