关键词: 牙轮钻头, 仿真, 模型, 切削

Abstract: Teeth(including gage insert,trimmer and off-gage insert) in the heel area play an important role in the drilling operation.They can improve both the rate of penetration(ROP) and the quality of the borehole wall.Based on modern geometry of roller cone bit, spatial models of a cone bit and transitory area of wall,the discrete model of a tooth,the model of bit/rock interaction are established.According to the above models,the corresponding simulation software are developed.The cutting ability of teeth in the heel area are evaluated and analyzed by the software.The process of interaction between bit and rock can be shown on the screen.At the same time,cutting work, frictional work and volume of rock cut can also be obtained.The software can guide designers to arrange teeth on cones correctly,which has a significant meaning in improving the whole performance of a cone bit.

Key words: roller cone bit, simulation, model, cutting