Three-dimensional convex ridge-type teeth in tight sandstone numerical simulation research on rock breaking mechanism

When drilling in difficult formations such as dense sandstone, PDC bits still encounter technical bottlenecks such as severe wear, low drilling efficiency, difficulty in rock penetration, and short service life. This study, based on the ABAQUS finite element analysis software, conducts simulation of the lateral cutting and rock breaking of three-dimensional convex ridge type teeth on dense sandstone, explores the rock breaking mechanism of three-dimensional ridge-type teeth, and reveals the mechanical characteristics and laws of rock cutting by this type of teeth. The simulation results show that by comparing the energy consumption relationship and cutting force curves of two types of teeth cutting rocks, it is found that the threedimensional convex ridge-type teeth have stable cutting and better performance. By changing the forward inclination angle of the three-dimensional convex ridge type teeth (5°-30°) and conducting cutting simulation comparisons, combined with the rock breaking specific energy of different angles of cutting, it is concluded that the optimal forward inclination angle is between 10°and 15°. The results of this study provide theoretical basis and reference for the selection of tooth shape, optimization of tooth arrangement parameters, and improvement of rock breaking efficiency of PDC bits in dense sandstone.