Abstract

The results of a numerical study of the effect of nanoparticle additives in the drilling fluid on the efficiency of cuttings removal from a horizontal well are presented. The rheological parameters of drilling fluids with nanoparticles (NPs) were set from the experiment. The SiO₂ and Al₂O₃ NPs were used. The concentration of NPs in the drilling fluids varied from 0.25 to 2 wt%, while their average diameter ranged from 5 to 50 nm. The Eulerian granular media approach was used to simulate the cutting transport from the borehole. The numerical model was tested in detail on well-known experimental data on sand suspension flow in a round pipe. A good agreement with the experiment was obtained. A systematic computational study of the influence of several parameters on the efficiency of removing cuttings from the well was carried out. These parameters included the well's inclination angle from the vertical direction, the speed of rotation of the drill pipe, the flow rate of the drilling fluid, and the concentration, size, and composition of nanoparticles. It is shown that the 2 wt% concentration of nanoparticles in the drilling fluid results in a 2.7-fold increase in the cutting transport performance for horizontal boreholes. The positive effect of adding nanoparticles to the drilling fluid is enhanced with decreasing nanoparticle size.

中文翻译：

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纳米颗粒添加剂对水平井眼切削传输性能影响的综合数值研究

摘要

给出了钻井液中纳米颗粒添加剂对水平井中岩屑清除效率影响的数值研究结果。从实验中设置了具有纳米颗粒（NPs）的钻井液的流变参数。SiO ₂和Al ₂ O ₃使用NP。钻井液中NP的浓度范围为0.25至2 wt％，而其平均直径为5至50 nm。欧拉颗粒介质方法被用来模拟从井眼的切割输送。该数值模型在圆管中沙质悬浮液流动的著名实验数据上进行了详细测试。获得了与实验的良好协议。对几个参数对从井中去除钻屑效率的影响进行了系统的计算研究。这些参数包括井垂直方向的倾斜角度，钻杆的旋转速度，钻井液的流速以及纳米颗粒的浓度，大小和组成。结果表明，钻井液中纳米颗粒的2 wt％浓度导致水平井眼的切削传输性能提高了2.7倍。随着纳米颗粒尺寸的减小，向钻井液中添加纳米颗粒的积极作用得以增强。