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利用欧拉模型的固、液两相流理论中标准K-ε三维湍流模型,对不同条件下小孔径底板锚固孔内钻渣运移过程进行三维动态分析,得出不同影响因素组合条件下排渣效果.利用相关理论计算钻渣运移过程中的压力损失,与数值分析结果对比误差较小.利用正交分析中的极差分析方法,得出决定排渣效果的影响因素由高到低依次为:排渣通道压力、进水通道孔径、机具长度、进水通道压力、排渣通道孔径.确定了底板锚固孔直径为28mm,钻孔深4m时,排渣通道压力为-3.0MPa、进水通道孔径为4mm、进水通道压力为5.0MPa、排渣通道孔径为8mm是最合理参数组合.
Using the standard K-ε three-dimensional turbulence model in solid-liquid two-phase flow theory of Eulerian model, the 3D dynamic analysis of the drilling fluid migration in the anchor holes of the small-diameter bottom plate under different conditions was carried out, and the relations among different influencing factors Slag effect.Using the relevant theory to calculate the pressure loss in the process of drilling slag migration, the error with the numerical analysis results is relatively small.Using the range analysis method in orthogonal analysis, the factors affecting the slag removal efficiency are obtained from high to low Followed by the pressure of the slag discharge channel, the diameter of the water inlet channel, the length of the tool, the pressure of the water inlet channel and the diameter of the slag discharge passage.The pressure of the slag channel was determined to be -3.0 MPa when the diameter of the anchor hole of the bottom plate was 28 mm and the depth of the drilling hole was 4 m, Intake passage diameter of 4mm, inlet channel pressure of 5.0MPa, slag passage channel diameter of 8mm is the most reasonable combination of parameters.