凹槽螺旋钻杆结构参数数值模拟与优化
Numerical Simulation and Optimization on Structural Parameters of Spiral Drill Pipe with Groove
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摘要: 为使凹槽螺旋钻杆在煤矿井下小孔径浅孔快速钻进时达到最快的成孔速度与最好的成孔质量，采用正交试验设计方法，运用工程流体动力学(EFD)对凹槽螺旋钻杆的凹槽结构参数进行数值模拟与优化，以得到最优的排渣凹槽结构。理论分析表明：凹槽数量N、凹槽深度d、凹槽宽度L、凹槽结构形式、凹槽螺距P、凹槽底部圆角半径R这6个结构参数显著影响φ63 mm凹槽螺旋钻杆的排渣效果。当N=3条、平底式凹槽结构、P=160 mm、L=30 mm、d=3.5 mm、R=4 mm时为φ63 mm凹槽螺旋钻杆的最优理论结构参数组合。Abstract: The structural parameters of grooves in the spiral drill pipe have been numerically simulated and optimized by means of orthogonal experimental design and engineering fluid dynamics (EFD) in order to acquire the fastest penetration rate and the best borehole quality while drilling in shallow slim holes in the coal mine with notched spiral drill pipe, thus the optimal structure of the discharge groove is obtained.Theoretical analysis has indicated that the number N,the depth d,the width L,the groove structure form, the screw pitch P and the bottom radius R of grooves,have an obvious influence on the discharge performance of the φ63 mm spiral drill pipe with grooves.In conclusion,the optimal theoretical structural parameter configuration of φ63 mm spiral drill pipe can be obtained with flat-bottomed grooves while N=3,P=160 mm,L=30 mm,d=3.5 mm and R=4 mm.
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