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Experimental measurement of dynamic effect in capillary pressure relationship for two-phase flow in weakly layered porous media

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posted on 30.10.2014, 11:56 authored by Diganta DasDiganta Das, Mahsanam Mirzaei
Well-defined laboratory experiments have been conducted to determine the significance of dynamic effect in capillary pressure relationships for two-phase flow in weakly heterogeneous (layered) porous media. The heterogeneous layers are composed of a fine sand layer sandwiched between two coarse sand layers. Dynamic and quasi-static capillary pressure-saturation (P-S) and ∂S/∂t-t relationships are determined, which are then used to determine the dynamic effect, indicated by a dynamic coefficient (τ). As well known, τ establishes the speed at which flow equilibrium (∂S/∂t = 0) is reached. In consistent with previous studies, τ is found to be a nonlinear function of saturation that depends on the medium permeability and the intensity of heterogeneity. τ values increase in the regions of less permeability (fine sand) in the domain. However, the τ-S functional dependence follows similar trends at different locations within the domain including regions of different permeability. We argue that saturation weighted average of local τ-S curves can be used as an effective τ-S curve for the whole domain which, when done, follows an exponential trend too. The effective τ-S curves suggest that the effective τ values for the porous layers lie between the τ values of coarse and fine sands at the same water saturation, and it is dominated by the τ values of coarse sand as it occupied the maximum volume of the domain. © 2012 American Institute of Chemical Engineers.

Funding

This study has been carried in the framework of the EPSRC (UK) Project GR/S94315/01, microheterogeneity and temperature effects on dynamic capillary pressure–saturation relationships for two-phase flow in porous media.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

AIChE Journal

Volume

59

Issue

5

Pages

1723 - 1734

Citation

DAS, D.B. and MIRZAEI, M., 2013. Experimental measurement of dynamic effect in capillary pressure relationship for two-phase flow in weakly layered porous media. AIChE Journal, 59 (5), pp. 1723 - 1734.

Publisher

© The Authors. AIChE Journal, published by Wiley on behalf of the AIChE

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Publication date

2013

Notes

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

ISSN

0001-1541

eISSN

1547-5905

Language

en