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首页> 外文期刊>Journal of nano research >The Impact of Nanoparticles Geometry and Particle Size on Formation Damage Induced by Drilling Nano-Fluid During Dynamic Filtration
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The Impact of Nanoparticles Geometry and Particle Size on Formation Damage Induced by Drilling Nano-Fluid During Dynamic Filtration

机译：纳米颗粒的几何形状和粒径对动态过滤过程中钻井纳米流体引起的地层损伤的影响

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摘要

In this paper, the impact of three parameters including nanoparticles geometry, particles aggregation and borehole inclination on induced formation damage from water based drilling fluids were investigated by means of experimental studies. Accordingly, we designed a dynamic filtration setup capable to rotate and change well inclination. Nano-based drilling fluids consisting of spherical, cubical and tubular shapes nanoparticles as fluid loss additives were used. Mud cake quality, core permeability impairment and degree of formation damage at various well inclinations were examined. The cluster structure of aggregated particles were determined using fractal theory and applying dynamic light scattering technique. For this purpose, drilling fluids were circulated at different well inclinations and at a constant differential pressure against a synthetic core. Field emission scanning electronic microscopy images taken from mud cakes confirmed the proposed cluster structures of nanoparticles. The experimental results show that the mud cake quality and degree of damage are functions of produced structure of aggregated particles. Moreover, by increasing the well inclination, the skin factor increases. However, this trend is intensively depended on particle geometry. Real time analysis of pore throat size to particle size ratio during mud circulation shows the tendency of particles to create external/internal filter cake is mainly related to well inclination and particle shape. The results can be used to optimize the size and shape of selected macroanoparticles as additives in drilling fluids to reduce formation damage in directional and horizontal wells during drilling operation.
机译：本文通过实验研究了纳米颗粒几何形状，颗粒聚集和井孔倾角这三个参数对水基钻井液引起的地层损伤的影响。因此，我们设计了一种动态过滤装置，能够旋转并改变井斜度。使用了由球形，立方和管状纳米颗粒组成的基于纳米的钻井液，作为降滤失添加剂。检查了各种井斜度下的泥饼质量，岩心渗透性损害和地层破坏程度。使用分形理论并应用动态光散射技术确定聚集颗粒的团簇结构。为此目的，使钻井液以不同的井斜度和恒定的压差在合成岩心上循环。从泥饼中获取的场发射扫描电子显微镜图像证实了拟议的纳米颗粒簇结构。实验结果表明，泥饼的质量和破坏程度是所产生的聚集颗粒结构的函数。而且，通过增加井的倾斜度，趋肤系数增加。但是，这种趋势主要取决于粒子的几何形状。泥浆循环过程中孔喉尺寸与粒径比的实时分析表明，颗粒形成外部/内部滤饼的趋势主要与井的倾角和颗粒形状有关。结果可用于优化选定的大颗粒/纳米颗粒作为钻井液中添加剂的大小和形状，以减少钻井作业期间定向井和水平井中的地层损害。

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