基于格子Boltzmann的煤岩渗透率研究方法
A Research Method for Coal and Rock Permeability Based on Lattice Boltzmann Method
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摘要: 为了快速准确的得到不同应力状态下煤岩的渗透率，提出一种基于格子Boltzmann方法和单轴压缩试验相结合的煤岩渗透率研究方法。首先对煤岩进行压缩破坏试验，获取应力应变曲线，并记录受压破坏过程中不同应力等级的煤岩裂纹图片，编制了孔隙尺度格子Boltzmann模拟程序，利用Grenoble试验对程序进行了验证。然后由程序读取裂纹图片，模拟流体在裂纹中的流动，获取流场压力和流体速度，基于达西方程计算出不同裂纹图片的渗透率数值，得到应力应变与煤岩渗透率的关系曲线，通过数据拟合，给出了应力-渗透率关系。最后与文献中的应力-渗透率关系进行了对比。
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关键词:
- 煤岩 /
- 渗透率 /
- 格子Boltzmann方法 /
- 单轴压缩 /
- 应力应变
Abstract: In order to get the permeability rapidly and exactly under different stress state, a method that combined lattice Boltzmann with uniaxial compression test is proposed to study the rock and coal permeability. Firstly, a destructive compression test was made on the coal-rock, and the stress-strain curve is obtained. And the coal-rock crack images under different stress levels are recorded during the process of compression. Then a simulation program of pore scale lattice Boltzmann is written and verified by Grenoble test. This program can read the crack images and simulate the flow of fluid in the crack, obtain the fluidity pressure and flow velocity. The value of permeability of different crack images can be calculated on the basis of Darcy equation. As a result, the relation curve of the stress-strain and coal-rock permeability is obtained. Through data fitting, we get the strain - permeability relationship, which is compared with the strain - permeability relationship in the literature.-
Keywords:
- coal-rock /
- permeability /
- lattice Boltzmann method /
- uniaxial compression /
- stress-strain
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