Kinetic interface sensitive tracers for estimating the fluid-fluid interfacial areas and interface mobility in two-phase flow systems: modelling and experiments
O 12.5 in Reactive transport in heterogeneous aquifers
24.03.2018, 10:00-10:15, 3
Quantifying the interfacial area in porous multiphase systems has been a subject of growing interest in disciplines where mass-transfer across interfaces is involved (Hassanizadeh and Gray 1990; Reeves and Celia 1996; Niessner and Hassanizadeh 2009). In this study, a proof of concept for a novel kinetic interface sensitive tracer (KIS) (Schaffer et al. 2013; Tatomir et al. 2015) is provided through the use of well-controlled dynamic column experiments in conjunction with the use of numerical simulations. Current literature has yet to show the applicability of KIS tracers under transient conditions and verify the applicability of macro-scale simulations to compute a pc-Sw-awn relationship. The study has shown the potential of KIS tracers in determining the awn under laboratory conditions, using a simple, low-cost experimental setup. An academic code Dumux (2-phase flow 5 component reactive transport) model and a commercial software Comsol Multiphysics (2 phase flow 2 component reactive transport) were independently used to match oil flooding (drainage) breakthrough curves determined from experimental data. Experimentally determined parameters were a key aspect in reducing the level uncertainty within the experimental system, showing a very good correlation with results of the n-octane BTC generated from curves after parameter optimization. The awn and reaction coefficient were the two primary variables essential to matching the 2-NSA concentration BTC. The reaction coefficient was determined through fluorospectrometry. The fluids used in the immiscible two phase flow column experiments are n-octane and water, which are analogue to a scCO2 – brine system.
The laboratory results are in good agreement with the modelled ones and also with other results reported in the literature.
Keywords: Reactive tracers, KIS tracers, two phase flow, Fluid-fluid interfacial area, model validation, CCS, geological storage of CO2
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