To overcome the defects in gas emission initial velocity method,a technology of dynamic separation of drill cuttings and gas has been developed in this study.The migration characteristics and influencing factors of gas leakage,leakage rate curve are investigated using theoretical analysis,orthogonal experimental method and single index range analysis.The results show that: the method of dynamic separation of drill cuttings and gas is feasible in engineering practice;the factors influencing the gas leakage i...