Analyses of Anti-erosion Performance of Drilling Cross under Emergent Discharge Conditions

Aiming at the problem of erosion of drilling cross in large displacement and emergent discharge condition, CFD software was used to simulate the erosion of the drilling cross in working conditions of daily discharge capacity of 1-10 million m³ and sunrise sand volume of 7.5-38.5 m³. The results show that with the increase of daily discharge volume, the gas flow rate of branch pipe section of the drilling cross increased to the local sound velocity, and the pressure drop increased to 0.98 MPa. When the discharge volume was more than 3 million m³, the main erosion regions of the inner wall of the drilling cross were transferred from the upper wall of main passage to the joint of main passage and branch pipe and the end of the branch pipe, and the maximum erosion rate increased to 19.42×10^-7 kg/(s·m²). When the discharge volume was more than 10 million m³ and the sand volume increased from 7.7 m³ to 38.5 m³, the maximum erosion rate increased from 3.68×10^-7 kg/(s·m²) to 19.42×10^-7 kg/(s·m²). The simulation results are basically consistent with measured field data.