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| 用流固耦合方法研究油藏压裂后应力应变和孔渗特性变化 | |
| 引用本文： | 范学平,徐向荣,张士诚.用流固耦合方法研究油藏压裂后应力应变和孔渗特性变化[J].岩土力学,2001,22(1):47-50. |
| 作者姓名： | 范学平 徐向荣 张士诚 |
| 作者单位： | 1. 新星石油公司上海海洋石油局 2. 西南石油局 3. 石油大学 |
| 摘 要： | 油藏压裂后将引起地应力场发生变化，使岩石变形，导致孔隙度和渗透率变化，进而影响产量，为研究这一问题，作者建立了油藏压裂后流－固耦合渗流模型，考虑了以下因素：油藏岩石变形，地应力，孔隙度和渗透率变化，人工裂缝，流体渗流与岩石应变耦合，储藏渗流与裂缝渗流耦合，非达西效应等。较详细地给出了耦合方程及推导过程，控制方程包括的未知变量有压力，饱和度及位移，11个变量，和11个方程，用有限差分方法将流体渗流和岩石应变方程离散成主对角占优的七对角矩阵，可在修改已有三维二相渗流和三维固体力学程序的基础上，采用隐式迭代方法求解，示例分析表明，用此模型可以研究储层应力变变，孔隙度和渗透率随时间和空间变化规律，为开发方案制定，整体压裂设计，压后生产管理等方面提供定量分析技术。 |
| 关 键 词： | 流固耦合法 压裂 多相流体 应力应变 数学模型 油藏 孔渗特性 孔隙度 渗透率 |
| 文章编号： | 1000-7598(2001)01-0047-04 |
| 修稿时间： | 2000年5月23日 |
Analysis on changes of stress strain porosity and permeability in multiphase reservoir with fluid-solid coupled and geomechanical mathematic simulation |
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| FAN Xueping,XU Xiangrong,Zhang Shicheng.Analysis on changes of stress strain porosity and permeability in multiphase reservoir with fluid-solid coupled and geomechanical mathematic simulation[J].Rock and Soil Mechanics,2001,22(1):47-50. | |
| Authors: | FAN Xueping XU Xiangrong Zhang Shicheng |
| Abstract: | Hydrolic fracturing will change the stress in petroleum reservoir and induce deformation in rock,so it will influence the fluid percolation. In this paper,a fluid-solid coupled and geomechanical math model was set up for fractured reservoir. In this model,the following factors were considered two phases of oil and water,hydrolic fracture,deformation of reservoir,changes of stress,porosity and permeability. There were eleven variables in the governing equations,which comprised matrix pore pressure,fracture pressure,fluid saturation,displacements. The system of the nonlinear governing partial differential equations was discretized using the finite difference method. The finite difference equations were arranged as seven-point stencils. A fully implicit procedure was adopted here for maximal numerical stability. By analysis,it is explicit that this model can be used to solve many problems,such as simulating deformation of reservoir,calculating changes of stress and strain,and analyzing changes of porosity and permeability in reservoir. |
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