Method for predicting shale nanopore permeability based on fractal theory
A nano-porosity and fractal theory technology, applied in permeability/surface area analysis, analysis materials, measurement devices, etc., can solve problems such as insufficient flow regime, inability to generalize, and pore pressure not considered, to reduce the cost of prediction and calculation. Fast, simple model effects
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[0065] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0066] A method for predicting the permeability of shale nanopores based on fractal theory, comprising the following steps:
[0067] First, based on the fractal theory and the capillary bundle model, the expressions of the flow section and the length scale represented by the fractal dimension are established, and the expressions of the flow section and the length scale are:
[0068]
[0069]
[0070] In the formula:
[0071] A is the flow cross-sectional area, m 2 ;
[0072] π is pi, dimensionless;
[0073] D. p is the fractal dimension of the pore area, dimensionless;
[0074] D. max is the diameter of the largest capillary bundle pipe, m;
[0075] φ is porosity, dimensionless;
[0076] D. min is the diameter of the minimum capillary bundle pipe, m;
[0077] L is the length scale, m;
[0078] D is the fractal dimension of pore area int...
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