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Title: Study of multi-phase flow in porous media : modeling of hysteresis and relative permeability data
Author: Aghabozorgi, Shokoufeh
ISNI:       0000 0004 7969 7241
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2019
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Simulation of many enhanced oil recovery (EOR) methods requires accurate modelling and determination of relative permeability (Kr) data under different saturation histories. Relative permeability is a function of several factors such as wettability, spreading coefficient and fluid pore occupancy. Experimental measurements of three phase Kr are time consuming and difficult considering infinite possible flow paths in the three-phase flow regime. There are several models in the literature to predict the oil relative permeability (Kro) data in three phase systems. Despite many studies reported, the available models can not accurately predict the oil relative permeability (Kro) in low oil saturation regions (e.g. WAG injection scenario). In addition, the saturation history dependency of relative permeability (i.e. hysteresis) should also be considered for simulation of WAG experiments. Although there are a few methods for modeling of hysteresis, the predicted values are still not adequate to simulate the hysteresis observed in two- or three-phase flow experiments. In this thesis, Stone's model has been modified to improve the prediction of oil relative permeability (Kro) data in low oil saturation regions. Then, a generalized WAG hysteresis model was developed to be coupled with the modified Stone's model to simulate the observed hysteresis in the experiments. The hysteresis model is developed based on the new techniques which predict the oil, water and gas saturations at the end of each injection cycle. The developed model also updates the water relative permeability data to capture the observed behaviours in WAG experiments reported in the literature. In addition, since the model is based on the interactions of a water phase and a hydrocarbon phase, it can be simplified to a two-phase system. The performance of the model was verified using experimental data obtained from two-phase and three-phase systems in sandstone rocks at different conditions (reported in the literature). The results showed that the developed model can simulate oil, water and gas production more accurately. Based on the results, the model can simulate the pressure behaviour observed in the experiments with dominant hysteresis. In addition, the developed model can predict the oil, water and gas saturations at the end of each cycle with higher accuracy compared to the available methods in the literature. The hysteresis in capillary pressure data was not considered in this study as it was out of the scope of this work.
Supervisor: Sohrabi, Mehran Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available