期刊
FUEL
卷 219, 期 -, 页码 353-363出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2018.01.114
关键词
Shale gas; Pore size distribution; Fractal structure; Shale matrix
资金
- NSERC/AIEES/Foundation CMG
- Alberta Innovates - Technology Futures Chairs
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.
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