中文摘要：

利用计算流体动力学（CFD）软件对水平井冲砂洗井过程中泡沫流体携砂能力进行了数值模拟。结果表明在油管居中情况下泡沫流体在环空中心部位体积分量最大，砂粒颗粒体积分量最小。砂粒在泡沫携带下，中心区域的砂粒速度随着运移路程不断变化，砂粒平均速度比入口速度略有增加。随着砂粒直径增加，发生冲蚀区域增加，其对泡沫携砂能力将产生更大影v向，但总体而言，砂粒对管壁的冲蚀速率非常小。泡沫流速为0．30m／s时，直径在0．1-2．0mm的砂粒基本上可以悬浮在泡沫流体中随泡沫一起运动，没有沉降现象；泡沫流速为0．90m／s和1．50m／s时，0．1～2．0mm直径砂粒可以顺利通过水平井段环空流道，砂粒直径越大，泡沫携砂能力越低。

英文摘要：

The numerical simulation has been carried out in the study on the sand carrying capability of foam fluid in horizontal well sand washing operations with the computational fluid dynamics （CFD） software. The results indicate that by simulation, we obtained the maximum volume fraction to of foam fluid and the minimum volume fraction to of sand particles are obtained in the center of annulus in when keeping the tube in the middle. Because of the carrying effect of foam fluid, the speed of sand particles in center area change with migration journey, and the average speed of sand particles increase slightly than inlet velocity. Erosion area increased with the sand size, and the increase of sand size also has large impact on the sand carrying capability of foam fluid. But overall, the erosion rate of sand to pipe wall is small. When the flow rate of foam is 0.30 m/s and the sand diameters range from 0.1 to 2.0 ram, sand particles can be suspended in the foam fluid and move with it, and there is no settlement phenomenon. When the flow rate of foam is 0.90 m/s or 1.50 m/s, the sand particles, ranging from 0.1 to 2.0 mm in diameter, can smoothly pass the annular flow channel in horizontal section. The bigger the sand diameter is, the lower sand carrying efficiency of foam.