Hemmati, N.Borazjani, S.Yang, S.Badalyan, A.Genolet, L.Behr, A.Zeinijahromi, A.Bedrikovetsky, P.2025-07-292025-07-292022Fuel: the science and technology of fuel and energy, 2022; 321:1873-7153-1-1873-7153-210016-23611873-7153https://hdl.handle.net/2440/146405The work aims at the laboratory validation and practical implementation of the steady-state-transient method for simultaneous determination of relative permeability Kr and capillary pressure Pc, which uses steady-state data along with the transient data between the steady states. A new methodology for preliminary choice of Kr and Pc and the detailed test modelling yields planning and design of the steady-state-transient test SSTT – the definition of admissible flow rate, number of steady states and injected water fractions, frequency and volumes of the effluent samples. The test-parameter choice is based on the newly derived theoretical criteria for validity of the model for two-phase flow in porous media, and the operational criteria for the accuracy of the measurements. The preliminary modelling also allows determining the type curves for transient pressure-drop histories, which are used to approximate the measured data and input the inverse solver. Two laboratory SSTTs with inlet half-moon and concentric-circle distributors are carried out. The agreement between the matched-modelling and experimental data for pressure-drop is significantly higher than for average saturation for both tests. The agreement for the test with the concentric-circle distributor is significantly closer than that of the half-moon distributor. This is explained by non-uniform saturation distributions in core cross-sections due to 3D flow, which is more pronounced in the case of half-moon distributor.en© 2022 Elsevier Ltd. All rights reserved.Water–gas flow; Relative permeability; Capillary pressure; Steady-state method; Transient data; Special core analysisJournal article10.1016/j.fuel.2022.123940608846Hemmati, N. [0000-0002-6892-7203]Borazjani, S. [0000-0003-3701-8143]Badalyan, A. [0000-0003-1130-6083]Zeinijahromi, A. [0000-0002-3088-6952]Bedrikovetsky, P. [0000-0002-4786-8275] [0000-0002-7100-3765] [0000-0003-2909-6731]