对钻井液的环空返速、流变性能、密度及井眼倾角、铣屑尺寸等参数对侧钻水平井套管段铣铣屑环空运移的影响进行了实验研究。结果表明，钻井液的环空返速、流变参数及密度增大时，井眼净化效果较好；铣屑的环空返出率随着井眼倾角、铣屑尺寸的增大呈下降趋势。给出了对铣屑进行定量描述和分类的可行方法。运用实验观察方法对比分析了铣屑和岩屑的环空运移机理，运用多元统计分析的方法建立了考虑上述诸影响因素时井眼净化的经验模式 The effects of annular velocity, rheological properties, density, wellbore inclination angle, milling cuttings size and other parameters on the annular migration of milling and milling cuttings in the horizontal well casing were experimentally studied. The results show that the wellbore cleaning effect is good when the annular velocity of return fluid, rheological parameters and density increase, and the annulus return rate of milling dust decreases with the increase of wellbore inclination angle and milling chip size . A feasible method of quantitatively describing and classifying milling cuttings is given. The mechanism of annihilation of milling cuttings and cuttings was comparatively analyzed by means of experimental observation. Multivariate statistical analysis was used to establish the empirical mode of borehole cleaning considering the above factors