Real gas transport in shale matrix with fractal structures
Real gas transport in shale matrix with fractal structures
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DOI：
10.1016/j.fuel.2018.01.114
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发表时间：
2018-05
期刊：
影响因子：
7.4
通讯作者：
Jinze Xu;Keliu Wu;Ran Li;Zhandong Li;Jing Li;Qilu Xu;Zhangxin Chen
中科院分区：
文献类型：
--
作者：
Jinze Xu;Keliu Wu;Ran Li;Zhandong Li;Jing Li;Qilu Xu;Zhangxin Chen
建立了具有分形结构的泥质基质中真实的气体运移模型，将孔隙尺寸分布和多种运移机制联系起来。该模型得到了实验的验证。结果表明，不同的孔隙尺寸分布导致不同的泥质基质的传输效率。孔隙尺寸的分形维数越大，最小孔隙尺寸越小，小孔出现的频率越高，自由气体的传输率越低，这进一步导致传输效率越低。由于孔隙尺寸分布参数（分形维数和最小孔隙尺寸）的气体传输效率随不同的孔隙率和压力而变化。分形维数的增加和最小孔径的减小导致努森扩散的总气体传输的贡献更高。降低的压力和增加的孔隙率增强了气体输送效率对孔径分布的敏感性。建立了不同孔径分布下视渗透率与孔隙度的关系式，可供工业应用。
A real gas transport model in shale matrix with fractal structures is established to bridge a pore size distribution and multiple transport mechanisms. This model is well validated with experiments. Results indicate that different pore size distributions lead to various transport efficiencies of shale matrix. A larger fractal dimension of the pore size and a smaller minimum pore size yield higher frequency of occurrence of small pores and a lower free gas transport ratio, which further results in lower transport efficiency. Gas transport efficiency due to pore size distribution parameters (a fractal dimension and a minimum pore size) varies with different porosities and pressures. Increasing fractal dimension and decreasing minimum pore size result in a higher contribution of Knudsen diffusion to the total gas transport. Decreased pressure and increased porosity enhance the sensitivity of gas transport efficiency to a pore size distribution. The relationship between apparent permeability and porosity based on different pore size distributions is also established for industrial application.