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本文调研了国内外近些年在页岩油(气)微尺度流动方面的研究成果.从分子动力学方法(MD)、格子玻尔兹曼方法(LBM)、孔隙网络模型(PNM)3种计算模型的角度展开分析,同时结合作者的前期工作,分析了影响页岩油(气)流动输运的关键因素,指出3种方法的局限性及存在的问题,认为PNM方法可作为微尺度流动研究的基础模型,并将3种方法之间的联系有机地体现在研究路线框图中,为页岩油(气)微尺度流动的研究指明了方向. 相似文献
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以科钻一井金刚石取心钻进所产生岩屑的颗粒分布为依据,结合钻井工艺对钻井液性能的要求,介绍了一种低固相、低黏度、低切力、低失水、高分散的膨润土泥浆材料--LBM-SD,并分析了LBM-SD膨润土的分散机理.LBM-SD是由优质钠基膨润土(NV-1)与小相对分子质量的三元共聚物按照一定比例,经过混炼挤压而成.小相对分子质量的三元共聚物为丙烯酸、丙烯酰胺和丙烯腈按照一定工艺聚合而成的共聚物,其分子链上含有大量的羧钠基、酰胺基和腈基.LBM-SD膨润土颗粒呈高分散状态,平均粒径小于3μm.与人工钠基膨润土相比,平均粒径降低了41.7%,平均质量比表面积提高了43.6%,E电位值增加了28.4%. 相似文献
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The multiscale transport mechanism of methane in unconventional reservoirs is dominated by slip and transition flows resulting from the ultra-low permeability of micro/nano-scale pores, which requires consideration of the microscale and rarefaction effects. Traditional continuum-based computational fluid dynamics (CFD) becomes problematic when modeling micro-gaseous flow in these multiscale pore networks because of its disadvantages in the treatment of cases with a complicated boundary. As an alternative, the lattice Boltzmann method (LBM), a special discrete form of the Boltzmann equation, has been widely applied to model the multi-scale and multi-mechanism flows in unconventional reservoirs, considering its mesoscopic nature and advantages in simulating gas flows in complex porous media. Consequently, numerous LBM models and slip boundary schemes have been proposed and reported in the literature. This study investigates the predominately reported LBM models and kinetic boundary schemes. The results of these LBM models systematically compare to existing experimental results, analytical solutions of Navier-Stokes, solutions of the Boltzmann equation, direct simulation of Monte Carlo (DSMC) and information-preservation DSMC (IP_DSMC) results, as well as the numerical results of the linearized Boltzmann equation by the discrete velocity method (DVM). The results point out the challenges and limitations of existing multiple-relaxation-times LBM models in predicting micro-gaseous flow in unconventional reservoirs. 相似文献
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Visualizing complex pore structure and fluid flow in porous media using 3D printing technology and LBM simulation 
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下载免费PDF全文 Pore structures of porous media and properties of fluid flow are key factors for the study of non-Darcy groundwater flow. However, it is difficult to directly observe pore structures and flow properties, resulting in a “black box” problem of porous media. This problem has hindered the in-depth study of the groundwater flow mechanism at the pore scale. In recent years, 3D rapid prototyping technology has seen tremendous development. 3D printing provides digital models and printing models of porous media with clear internal structure. Thus, Lattice Boltzmann Method can be used to simulate the flow processes at the pore scale based on real pore structures. In this study, 3D printing cores and Lattice Boltzmann Method were coupled to conduct both laboratory and numerical experiments in spherical porous media with different sphere diameters and periodic arrays. The LBM simulation results show a good agreement with laboratory experimental results. With the advantages of LBM and 3D printing, this approach provides a visualization of the complex pore structure and fluid flow in pores, which is a promising method for studies of non-Darcy groundwater flow at the pore scale. 相似文献
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