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Title: Pore-scale lattice Boltzmann simulation of micro-gaseous flow considering surface diffusion effect

Journal Article · · International Journal of Coal Geology
 [1]; ORCiD logo [2];  [3];  [1]
  1. Univ. of New South Wales, Sydney, NSW (Australia). School of Petroleum Engineering
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Xi'an Jiaotong Univ., Shanxi (China). School of Energy and Power Engineering

Some recent studies have shown that adsorbed gas and its surface diffusion have profound influence on micro-gaseous flow through organic pores in shale gas reservoirs. Here, a multiple-relaxation-time (MRT) LB model is adopted to estimate the apparent permeability of organic shale and a new boundary condition, which combines Langmuir adsorption theory with Maxwellian diffusive reflection boundary condition, is proposed to capture gas slip and surface diffusion of adsorbed gas. The simulation results match well with previous studies carried out using Molecular Dynamics (MD) and show that Maxwell slip boundary condition fails to characterize gas transport in the near wall region under the influence of the adsorbed gas. The total molar flux can be either enhanced or reduced depending on variations in adsorbed gas coverage and surface diffusion velocity. The effects of pore width, pressure as well as Langmuir properties on apparent permeability of methane transport in organic pores are further studied. It is found that the surface transport plays a significant role in determining the apparent permeability, and the variation of apparent permeability with pore size and pressure is affected by the adsorption and surface diffusion.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; National Nature Science Foundation of China
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1416302
Report Number(s):
LA-UR--17-27595
Journal Information:
International Journal of Coal Geology, Journal Name: International Journal of Coal Geology Journal Issue: C Vol. 169; ISSN 0166-5162
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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