基于CFD模拟的钻屑清除器的优化设计与分析

Optimization Design and Analysis of Drilling Cutting Removing Device Based on CFD Simulation

为了对钻屑清除器周边的钻井液流场进行全面、准确分析,对钻屑清除器周边的钻井液流场进行了仿真。采用正交试验的设计方法,对钻屑清除器进行了轴向速度、径向速度和湍流强度的FLUENT模拟,并对流域内距离井眼壁面3.5 mm直线上的模拟结果进行了极差分析和方差分析,科学地解释了主要结构参数及工艺参数对钻井液流场内轴向速度、径向速度和湍流强度的影响规律,对其结构参数提出优化建议。通过对2次正交设计的试验结果进行极差分析、综合平衡分析和方差分析,得到了最终的优化参数。优化方案试验结果表现出较好的除岩和携岩效果。研究结果为钻屑清除器的设计与工程应用提供了科学依据。

To comprehensively and accurately analyze the drilling fluid flow field around cutting removing device ,so that to provide necessary technical support for cutting removing structure optimization, the drilling fluid flow field around cutting removing device has been simulated. Using orthogonal experiment method, FLUENT simulations on axial velocity, radial velocity and turbulence intensity of drilling fluid around cutting removing device has been conducted. The range analysis and variance analysis on the simulation results on the straight line 3. 5 mm from the borehole wall has been carried out. The effect of the main structural parameters and process parameters on the axial velocity, radial velocity and turbulence intensity of drilling fluid has been explained, and then the structure parameter optimization of drilling cutting removing device has been proposed. The optimal parameters have been attained by the range analysis, overall balance analysis and variance analysis on the two orthogonal design test results. The optimization test results showed good cutting removing and carrying effect. The study results could provide scientific bases for the drilling cutting removing device design and engineering applications.