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为了深入探讨管壁摩擦阻力系数对摩擦压降的影响规律,基于自主设计的室内多相复杂流动试验装置,以白油作为介质,测量了高黏油条件下的防砂筛管摩擦阻力系数。试验结果表明:流速较低时,防砂筛管阻力系数比普通圆管摩擦阻力系数小;流速较高时,防砂筛管阻力系数比普通圆管摩擦阻力系数高;存在临界雷诺数之比(壁面入流雷诺数与主流雷诺数之比),当雷诺数之比小于此临界值时,井筒变质量流动压降小于普通圆管流动压降,反之,则井筒变质量流动压降大于普通圆管流动压降。通过数据分析拟合,得到了星孔防砂筛管的阻力系数模型,并与试验结果进行了对比验证。结果表明模型的平均相对误差为8.33%,最大相对误差为17.94%,满足工程应用要求。
In order to deeply discuss the influence rule of the friction coefficient of the pipe wall on the friction pressure drop, the coefficient of frictional resistance of the sand screen under high oil viscosity was measured based on the self-designed indoor multi-phase complex flow test device using white oil as the medium. The results show that when the flow velocity is low, the drag coefficient of the sand control screen tube is smaller than that of the common circular tube. When the flow rate is high, the drag coefficient of the sand control screen tube is higher than the frictional resistance coefficient of the common circular tube. When the Reynolds number is less than the critical value, the pressure drop of the wellbore variable mass flow is smaller than the pressure drop of the normal pipe. On the contrary, the pressure drop of the wellbore variable mass flow is larger than that of the ordinary pipe Pressure drop. Through the data analysis and fitting, the drag coefficient model of the sand screen of the star-hole sand was obtained, and compared with the test results. The results show that the average relative error of the model is 8.33% and the maximum relative error is 17.94%, which meets the requirements of engineering application.