Simulation of Gas Flow in Nano-scale Pores of Shale Gas Deposits

doi:10.11885/j.issn.1674-5086.2015.03.16.03

Abstract

Abstract:

As an important unconventional natural gas resources，shale gas has aroused wide concern. Shale-gas deposits are
abundant in nano-scale pores. However，the study on the gas flow mechanism is still inadequate，which restricts the efficient
development of shale gas reservoirs. For nanometer pores，a novel single component mathematical model of shale gas which
takes into consideration the adsorption-desorption of shale gas，the surface diffusion of the adsorbed phase，Darcy flow，and
slip flow as well as Knudsen diffusion is proposed. The simulation results show that for shale matrix containing a large number
of nano-scale pores，methane adsorbed on the pore，the seepage flow and Knudsen diffusion all exert influences on gas flow and
make the apparent permeability much higher than absolute permeability. The smaller the pore size and the lower the pressure
is，the larger the difference between the apparent permeability and absolute permeability is. The study of the impact of various
transport mechanisms on gas flow is helpful to understand the process of shale gas production and to guide the development of
shale gas reservoir.

Key words: shale-gas deposits, nano-scale pore, adsorption-desorption, seepage flow, Knudsen diffusion

Duan Yonggang1*, Cao Tingkuang1, Yang Xiaoying1, Zhang Ying2, Wu Guiping1. Simulation of Gas Flow in Nano-scale Pores of Shale Gas Deposits[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.03.16.03.

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