Mechanical optimization design and experimental analysis of mine tricone bit nozzle

Abstract

This paper explores the optimal design of cone bit nozzle diameter and a comparative analysis of cone tooth stress. When drilling the tricone bit, direct contact between the roller casing and the wellbore is prone to wear. The fluid emitted from the cone bit nozzle helps reduce friction and reduce temperature. In this paper, a three-dimensional model is established using the software, and then the surface shear stress of the cone bit under the action of the flow field is simulated. The larger the shear stress is, the more serious the wear is. The simulation results show that when the nozzle diameter is φ17mm, the maximum shear stress on the surface of the roller is 6640Pa. When the nozzle diameter is φ22mm, the maximum shear stress on the surface of the roller is 3040Pa, which is 50% lower than that of the nozzle diameter φ17mm. Through the analysis, improving the wear of the cone housing of the drill bit, the diameter of the nozzle of the 9SRA545R tricone bit is changed from φ17mm to φ22mm, which can effectively reduce the erosion degree of the rock debris on the surface of the cone, to improve the wear degree of the cone housing.