Simulation of WAG floods in an oil-wet micromodel using a 2-D pore-scale network model

摘要: Abstract In this paper, we describe some novel multi-cycle water-alternating-gas injection (WAG) floods in 2-D etched glass oil-wet micromodels, which have simulated using our recently developed three-phase, 3-D mixed-wet network model. A similar approach was described previously for WAG a water-wet system [van Dijke, M.I.J., Sorbie, K.S., Sohrabi, M., Tehrani, D., Danesh, A., 2002. Three-phase flow processes porous media: pore-scale simulations and comparison with micromodel experiments. SPE 75192, Proc. SPE/DOE Symposium on Improved Oil Recovery, Tulsa, Oklahoma, April 2002]. Although direct observation at the is possible micromodel, experimental data, required as input parameters model, not directly available. Therefore, limited sensitivity study performed, investigating effects of presence or absence oil wetting films, around either gas water, degree wettability, leading to variation order water. Based these calculations, films are implemented water only, fraction all pores, such that initial pattern can be kept relatively sparse. Furthermore, evidence support being strongly oil-wet, since more readily leads displacing rather than With estimated concerning order, then two experiments, first one starting flood second flood. Satisfactory agreement between simulation experiment found terms fluid distributions recovery profiles. addition, analysis displacement statistics, including length (e.g. singles, doubles, multiples) types displacements oil), broadly consistent experiment, far information This paper illustrates application model validate local assumptions underlying mechanism (on wettability), used predict what emergent global properties three-phase micromodel.