Nonlinear Behaviour of Mass Transfer Mechanisms in Solvent Oil Recovery

Abstract:

Literature has indicated that, experimentally, solvent fronts in hybrid thermal solvent recovery processes progress more rapidly than what can be predicted using current approximations and more rapidly than thermal processes alone [1]. The equations that govern thermal multiphase flow through porous media are extremely complex and it is very difficult to decouple the contribution of the mass transfer mechanisms from the thermal effects. This paper explores the behavior of the mass transfer mechanisms in these processes through an examination of the nonlinear one-dimensional advection diffusion/dispersion (ADD) equation using finite difference methods. Earlier work [2] indicated that the linear ADD equation, using physically estimated parameters for diffusion and dispersion coefficients obtained from the literature, could not account for the solvent front progression rate predicted by Edmunds [3]. The results in this preliminary study indicate that the nonlinear effects are important in predicting the progression of a solvent front using the one dimensional ADD equation. The shapes and rate of propagation of the concentration profiles are influenced by both velocity and diffusion functionality. These results are more consistent with the solvent front propagation rate predicted by Edmunds [3]. These results also suggest that including nonlinear effects in traditional reservoir simulation software may be necessary in the modeling of solvent processes. Further work is needed to explore and understand the influence of the velocity and diffusion functionality necessary to mimic the behaviour observed in thermal solvent recovery processes and to further increase the understanding of their impact on solvent front propagation.

• Periodical: Defect and Diffusion Forum (Volume 379)
• Pages: 181-188
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.379.181
• Online since: November 2017
• Authors: Shelley Lorimer*, Caine Smithaniuk
• Keywords: Diffusion, Dispersion, Nonlinear Mass Transfer Mechanisms, Solvent Hybrid Recovery Processes

References

[1] J.E. Nenniger and S.G. Dunn, How Fast is Solvent Based Gravity Drainage,, PETSOC-2008-139, Canadian International Petroleum Conference, 17-19, Calgary, Alberta, Petroleum Society of Canada (2008).

DOI: 10.2118/2008-139

[2] S. Lorimer, R. Boehnke, and B. Meza, Mass Transfer Behaviour in Hybrid Solvent Oil Recovery Processes,, Defect and Diffusion Forum, Vol. 367, pp.77-85, 20160.4028/www.scientific.net/DDF.367.77, (2016).

DOI: 10.4028/www.scientific.net/ddf.367.77

[3] N.R. Edmunds, Observations on the Mechanism of Solvent-Additive SAGD Processes,, SPE Paper 165419 presented at the SPE Heavy Oil Conference Canada held in Calgary, Alberta, Canada, 11-13 June, (2013).

[4] P. Gosselin, S.E Hrudey, M. Naeth, A. Plourde, R. Therrien, G Van Der Kraak, and Z. Xu, Environmental and Health Impacts of Canada's Oil Sands Industry Report,, The Royal Society of Canada Expert Panel, 438 pages, (2010).

DOI: 10.1021/es300858k

[5] L.A. James, Mass Transfer Mechanisms during the Solvent Recovery of Heavy Oil,, Ph.D. Thesis, University of Waterloo, Waterloo, ON, Canada, (2009).

[6] M. Ardali, M. Barrufet, D. Mamora, and F. Qiu, A Critical Review of Hybrid Steam/Solvent Processes for the Recovery of Heavy Oil and Bitumen,. Society of Petroleum Engineers.

DOI: 10.2118/159257-MS

[7] E.Z. Evulukwu, Experimental Investigation of Concentration Dependent Non-ideal Diffusion in Hydrocarbon Systems.,, Masters Thesis, Memorial University of Newfoundland, (2015).

[8] M. Sabeti, M. R. Ehsani, M. Nikookar, A. H. Mohammadi, Estimation of effect of diffusion and dispersion parameters on VAPEX process,, Journal of Petroleum Science and Engineering, Vol. 132, 53-64, 10.1016/j.petrol.2015.04.031, (2015).

DOI: 10.1016/j.petrol.2015.04.031

[9] Q. Wang, X. Jia, and Z. Chen, Modelling of Dynamic Mass Transfer in a Vapour Extraction Heavy Oil Recovery Process,, Can. J. Chem. Eng., 95: 1171–1180.

DOI: 10.1002/cjce.22743

[10] S. P. Neuman, Universal Scaling of Hydraulic Conductivities in Geological Media,, Water Resour. Res., 26(8), 1749–1758, (1990).

DOI: 10.1029/wr026i008p01749