Investigation of Shale Gas Numerical Simulation Method Based on Discrete Fracture Network Model

MI Li-dong, JIANG Han-qiao, LI Jun-jian

doi:10.11764/j.issn.1672-1926.2014.11.1795

Natural Gas Geoscience >

2014 , Vol. 25 >Issue 11: 1795 - 1803

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.11.1795

Investigation of Shale Gas Numerical Simulation Method Based on Discrete Fracture Network Model

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MOE Key Laboratory of Petroleum Engineering，China University of Petroleum（Beijing）,Beijing 102249,China

Received date: 2014-01-24

Revised date: 2014-03-21

Online published: 2019-09-20

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Abstract

The theoretical study about the shale gas development is still in infancy although it has become a focus of the world today.Most shale gas numerical simulation methods based on the continuous medium model,which is used for conventional oil and gas reservoir,cannot accurately characterize the shale gas special percolation features.This article introduced a shale gas seepage flow model which is established based on the Discrete Fracture Network (DFN) and the flow mechanisms,which accurately characterizes the diffusion in kerogen,adsorption-desorption on pore wall,gas slippage and Knudsen diffusion in nonporous,and also the non-Darcy flow in fractures.Finite difference method is employed for numerical solution of nonlinear partial differential equations and the preliminary simulation results show that: the slippage and Knudsen diffusion have a great effect on the shale gas production,especially the diffusion in kerogen and adsorption play key roles in extending stable production time in shale gas reservoir|The comparison with the results of CMG (2012 Edition) shows that the DFN model is more consistent with the actual situation in the simulation of fractured shale gas reservoir.

Key words： DFN; Adsorption-desorption; Knudsen diffusion; Slippage effect; Diffusion

Cite this article

MI Li-dong, JIANG Han-qiao, LI Jun-jian . Investigation of Shale Gas Numerical Simulation Method Based on Discrete Fracture Network Model[J]. Natural Gas Geoscience, 2014 , 25(11) : 1795 -1803 . DOI: 10.11764/j.issn.1672-1926.2014.11.1795

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