Residual Oil Saturation Under Mixed-Wet Conditions: A Direct Comparison Between Indiana Limestone and its Microfluidic Analogue

Yukie Tanino, Magali Christensen, Xanat Zacarias Hernandez
School of Engineering, University of Aberdeen, UK

This paper was prepared for presentation at the International Symposium of the Society of Core Analysts held in
Vienna, Austria, 27 August - 1 September 2017

Abstract:
We present laboratory measurements of residual oil saturation established by secondary waterflood in packed beds of crushed calcite assembled in a microfluidic channel under mixed-wet conditions. The measurements are compared with analogous measurements in Indiana limestone cores using the same test fluids and comparable injection rates. The wettability is characterized by the advancing contact angle of the flood water on a mineralogically representative substrate submerged in the oil phase, which ranged from θa = 90 to 160.

While residual oil saturation is larger in the microfluidic analogue than the limestone cores over the full range of θa considered presently, its dependence on θa is qualitatively similar for both media and is well described by a concave-up quadratic function. Maximum recovery occurs at moderately oil-wet conditions of θa = 130 in Indiana limestone and 120 in its microfluidic analogue. These findings demonstrate that salient features of oil/brine flow through O(10)cm-long cores are conserved in two-dimensional microfluidic models under conditions considered presently.


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Objectives
The name of this organization is the Society of Core Analysts (SCA) and was founded in 1986. This organization is a Chapter-at-Large of The Society of Petrophysicists and Well Log Analysts (SPWLA) and is established with two objectives:

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