To address the lack of consensus on the slug flow pattern and control factors in the middle section of res-ervoir fractures,the flow pattern of slug in fracture is studied,the influence and fluctuation characteristics of key parameters of slug flow are analyzed,such as fracture diameter and gas-liquid phase flow rate.The results indicate that the two-phase slug flow presents periodic characteristics in the fracture by using micro-scale flow simulation experimental device of two phase(gas and liquid)migration and production,.From formation to disappearance,the gas slug can be divided into three stages:formation,expansion and dominance.The fracture diameter is linear-ly negatively correlated with the slug frequency and linearly positively correlated with the fluctuation range of gas and liquid phase flow.As the liquid flow rate was set at 15.00,20.00,25.00 and 30.00 cm3/min,the variance ratio of slug frequency decreased with increasing gas flow rate,being 0.130,0.012,0.009 and 0.007,respective-ly.Similarly,the variance ratio of liquid holdup decreased with increasing gas flow rate,being 1.503,1.175,0.918 and 0.820,respectively.The findings have guiding significance for the study of slug flow mechanism in the process of coalbed methane development.
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