1887

Abstract

Summary

Shale gas permeability needs to be estimated in order to predict the quality of shale gas reservoirs and to develop shale gas production strategies. With advances in high-resolution imaging technology, one can characterise the pore space of a gas shale sample, which typically contains pores ranging from micrometers to nanometers, and to construct a pore-space model to simulate the gas flow numerically and to calculate the permeability. Gas flow has long been known to behave differently in such a confined space, and the smaller the pores the larger discrepancy is generally expected between gas and liquid (e.g. water) permeability. Since shale gas molecules stored mainly in nano-metre pores in kerogens by gas adsorption, adsorbed gas molecules, of half-nanometres in diameter, could reduce the pore size for free gas flow substantially and so alter the gas permeability significantly.

In this work, we extended a model for modelling shale gas flow to account for the gas adsorption effect. We adopted the Langmuir single-layer adsorption model to the multiple layers. We analysed the gas adsorption impact on the permeability on a cylindrical pore analytically, and on a shale sample whose pore space are represented as a node-and-bond pore network, using our network flow model ( ). The results revealed that the adsorption effect depends strongly on the gas pressure and the radii of pores. Given that low gas pressure increases gas slippage at pore surfaces and decreases the thickness of the adsorption layers then, consequently, enhances the permeability, undesirable operation conditions could lead to an earlier decline of gas production.

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/content/papers/10.3997/2214-4609.20141794
2014-09-08
2024-03-29
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References

  1. Ma, J., Sanchez, J.P., Wu, K., Couples, G.D. and Jiang, Z.
    [2014] A pore network model for simulating non-ideal gas flow in micro- and nano-porous materials. Fuel. 116, 508–.
    [Google Scholar]
  2. Langmuir, I.
    [1918] The Adsorption of Gases on Plane Surfaces of Glass, Mica and Platinum. Journal of the American Chemical Society, 40, 403–.
    [Google Scholar]
  3. Boyer, C., KieschnickJ., Suarez-Rivera, R., Lewis, R.E. and Waters, G.
    [2006] Producing gas from its source. Oilfield Review, 18, 49–.
    [Google Scholar]
  4. Rexer, T.F.T., Benham, M.J., Aplin, A.C. and Thomas, K.M.
    [2013] Methane Adsorption on Shale under Simulated Geological Temperature and Pressure Conditions. Energy & Fuels, 27, 109–.
    [Google Scholar]
  5. Brunauer, S., Emmett, P.H. and Teller, E.
    [1938] Adsorption of Gases in Multimolecular Layers. Journal of the American Chemical Society, 60, 19–.
    [Google Scholar]
  6. Nguyen, P.T.M., Do, D.D. and Nicholson, D.
    [2013] Pore connectivity and hysteresis in gas adsorption: A simple three-pore model. Colloids and Surfaces A. Physicochemical and Engineering Aspects, 437, 68–.
    [Google Scholar]
  7. Jiang, Z., Wu, K., Couples, G., Van Dijke, M., Sorbie, K. and Ma, J.
    [2007] Efficient extraction of networks from three - dimensional porous media. Water resources research, 43.
    [Google Scholar]
  8. Wu, K., Van Dijke, M.I., Couples, G.D., Jiang, Z., Ma, J., Sorbie, K.S. et al.
    [2006] 3D stochastic modelling of heterogeneous porous media-applications to reservoir rocks. Transport in porous media, 65, 67–.
    [Google Scholar]
  9. Klaver, J., Desbois, G., Urai, J.L., Littke, R.
    [2012] BIB-SEM study of the pore space morphology in early mature Posidonia Shale from the Hils area, Germany. International Journal of Coal Geology, 103, 25–.
    [Google Scholar]
  10. Ma, J., Wu, K., Jiang, Z. and Couples, G.D.
    [2010] SHIFT: An implementation for lattice Boltzmann simulation in low-porosity porous media. Physical Review E., 81, 056702.
    [Google Scholar]
  11. Rouquerol, J., Avnir, D., Fairbridge, C., Everett, D., Haynes, J., Pernicone, N., et al.
    Recommendations for the characterization of porous solids (Technical Report). Pure and Applied Chemistry, 66, 1739–58.
    [Google Scholar]
  12. Brunauer, S., Deming, L.S., Deming, W.E. and TellerE.
    [1940] On a Theory of the van der Waals Adsorption of Gases. Journal of the American Chemical Society, 62, 32–.
    [Google Scholar]
  13. Donohue, M.D. and Aranovich, G.L.
    [1999] A new classification of isotherms for Gibbs adsorption of gases on solids. Fluid Phase Equilibria, 158-160, 63–.
    [Google Scholar]
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