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裂缝性页岩气储层三维多簇水力裂缝竞争扩展数值模拟
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作者 黄刘科 廖兴川 +3 位作者 陈朝伟 谭鹏 谭劲 王灿 《工程地质学报》 CSCD 北大核心 2024年第4期1292-1300,共9页
页岩气水平井多簇水力裂缝延伸效率是影响压裂效果的关键,现场监测发现大量射孔簇无法进液、多簇非均匀起裂扩展问题突出,深入认识三维空间中天然裂缝对多簇水力裂缝竞争扩展的影响规律具有重要意义。为此,基于离散格子方法建立三维全... 页岩气水平井多簇水力裂缝延伸效率是影响压裂效果的关键,现场监测发现大量射孔簇无法进液、多簇非均匀起裂扩展问题突出,深入认识三维空间中天然裂缝对多簇水力裂缝竞争扩展的影响规律具有重要意义。为此,基于离散格子方法建立三维全耦合随机裂缝性页岩储层三簇压裂数值模型,精细刻画多簇水力裂缝竞争起裂、扩展以及天然裂缝相互作用的全过程演化规律,研究地应力差、簇间距、压裂液黏度及排量等参数影响下多簇水力裂缝扩展行为,提出多簇延伸效率的施工对策。结果表明:水力裂缝与天然裂缝相遇时表现为穿透、转向、分叉等单一或多种复合模式;天然裂缝网络会加剧多簇裂缝竞争扩展时的应力阴影效应,中间受到抑制的射孔簇容易沿天然裂缝转向或者分叉并与其他射孔簇发生融合,降低整体改造面积;地应力差越小、簇间距越小,缝间应力干扰越明显,裂缝延伸规模越小;增大压裂液黏度或排量,中间簇水力裂缝受应力干扰程度减弱,延伸距离更远,建议现场在前置液阶段适当提高压裂液黏度、在主压裂阶段增大排量,以提高多簇水力裂缝的延伸效率。研究成果可为页岩气储层射孔分段以及压裂参数优化设计提供指导。 展开更多
关键词 水力压裂 深层页岩 三维离散格子 天然裂缝网络 缝间干扰
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三维非均匀介质中弹性波传播的数值模拟 被引量:5
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作者 张剑锋 刘铁林 《固体力学学报》 CAS CSCD 北大核心 2001年第4期356-360,共5页
提出了一种三维非均匀介质中弹性波传播数值模拟的方法 ,文中称为三维格子法 .该算法是二维格子法 (一种二维非均匀介质中P SV波传播的数值模拟算法 )向三维非均匀介质情况的推广 .在空间离散上该文方法与有限元方法类似 ,容许根据连续... 提出了一种三维非均匀介质中弹性波传播数值模拟的方法 ,文中称为三维格子法 .该算法是二维格子法 (一种二维非均匀介质中P SV波传播的数值模拟算法 )向三维非均匀介质情况的推广 .在空间离散上该文方法与有限元方法类似 ,容许根据连续体的形状和介质分界面任意剖分网格 ,且自然满足自由表面边界条件 .不同于常规有限差分法在各个节点上满足动力学微分方程 ,该算法通过满足各节点周围格子的整体平衡 (积分平衡方程 )来对问题进行求解 .三维格子法所需的计算机内存及计算耗时与同阶精度的规则网格有限差分法相当 .算例表明 ,该文提出的三维格子法具有较高的精度且可很好地模拟三维复杂形状地表对弹性波的反射和绕射 . 展开更多
关键词 三维弹性波模拟 三维格子法 有限差分 非均匀介质 自由表面边界条件 数值模拟 三维复杂形状地表
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Simulation and visualization of the displacement between CO2 and formation fluids at pore-scale levels and its application to the recovery of shale gas 被引量:8
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作者 Peng Hou Yang Ju +2 位作者 Feng Gao Jianguo Wang Jian He 《International Journal of Coal Science & Technology》 EI 2016年第4期351-369,共19页
This article reports recent developments and advances in the simulation of the CO2-formation fluid displacement behaviour at the pore scale of subsurface porous media. Roughly, there are three effective visualization ... This article reports recent developments and advances in the simulation of the CO2-formation fluid displacement behaviour at the pore scale of subsurface porous media. Roughly, there are three effective visualization approaches to detect and observe the CO2-formation fluid displacement mechanism at the micro-scale, namely, magnetic resonance imaging, X-ray computed tomography and fabricated micromodels, but they are not capable of investigating the dis- placement process at the nano-scale. Though a lab-on-chip approach for the direct visualization of the fluid flow behaviour in nanoscale channels has been developed using an advanced epi-fluorescence microscopy method combined with a nanofluidic chip, it is still a qualitative analysis method. The lattice Boltzmann method (LBM) can simulate the CO2 displacement processes in a two-dimensional or three-dimensional (3D) pore structure, but until now, the CO2 displace- ment mechanisms had not been thoroughly investigated and the 3D pore structure of real rock had not been directly taken into account in the simulation of the CO2 displacement process. The status of research on the applications of CO2 displacement to enhance shale gas recovery is also analyzed in this paper. The coupling of molecular dynamics and LBM in tandem is proposed to simulate the CO2-shale gas displacement process based on the 3D digital model of shale obtained from focused ion beams and scanning electron microscopy. 展开更多
关键词 CO2-formation fluid displacement Micro- and nano-pore scale Shale gas recovery Lattice Boltzman nmethods - Molecular dynamics FIB-SEM
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Three-dimensional simulation of interfacial convection in CO_2–ethanol system by hybrid lattice Boltzmann method with experimental validation
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作者 陈炜 陈淑勇 +2 位作者 袁希钢 张会书 余国琮 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第2期356-365,共10页
By using a hybrid lattice-Boltzmann–finite-difference method(hybrid LBM–FDM method),three-dimensional simulations of solutal interfacial convection were conducted for the process of CO2absorption into ethanol.A self... By using a hybrid lattice-Boltzmann–finite-difference method(hybrid LBM–FDM method),three-dimensional simulations of solutal interfacial convection were conducted for the process of CO2absorption into ethanol.A self-renewal interface model is adopted as an interfacial perturbation model.The simulation results revealed some three-dimensional features of the induced interfacial convection,such as the development of diverging cellular flow and Rayleigh plume-like convection in liquid phase.The concentration distribution of the simulation result is validated and found to be in well agreement with the Schlieren visualization results qualitatively.Additionally,the mass transfer enhancements by interfacial convection were investigated via both simulation and experiment for the absorption process,and the mass transfer is shown to be enhanced by the interfacial convection by about two-fold comparing with that by diffusion. 展开更多
关键词 Hybrid LBM–FDM Solutal interfacial mass transfer Interfacial convection Mass transfer rate Schlieren technique
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A PRECONDITIONER FOR THREE-DIMENSIONAL DOMAIN DECOMPOSITION METHODS WITH LAGRANGE MULTIPLIERS
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作者 HUQiya LIANGGuoping LIUJinzhao 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2003年第4期513-526,共14页
In this paper we consider domain decomposition methods for three-dimensional elliptic problems with Lagrange multipliers, and construct a kind of simple preconditioner for the corresponding interface equation. It will... In this paper we consider domain decomposition methods for three-dimensional elliptic problems with Lagrange multipliers, and construct a kind of simple preconditioner for the corresponding interface equation. It will be shown that condition number of the resulting preconditioned interface matrix is almost optimal. 展开更多
关键词 domain decomposition non-matching grids lagrange multipliers PRECONDITIONER condition number
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