| Geylani Panahov, Eldar Abbasov, Ibrahim Mamedov, Afet Yuzbashiyeva Modelling of in-situ gas generation in inhomogeneous porous medium |
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| Abstract. As one of the effective methods of heavy, highly viscous oil production is the impact on the reservoir by various physical and chemical methods, including both thermal technologies and the use of aqueous solutions of chemical agents as flooding agents. Technologies based on the use of various chemical additives to water to change the wetting characteristics of the porous medium have been used in oil production practice for many years. Aqueous solutions of alkali used as injection agents in the technology of alkaline flooding of oil fields at the late stage of development are widely spread as displacing agents. When oil is displaced from the reservoir by agents mixed with it, the problem of complete elimination of the interface between oil and the displacing agent is radically solved, capillary forces “disappear”, oil dissolves in the injected fluid. It was assumed that along with the effects of interfacial tension reduction, oil emulsification, changes in rock wettability, etc., the interaction between the alkaline solution and active acid components of oil, accompanied by active gas generation, has a significant impact on oil recovery enhancement during alkaline flooding. Simulation laboratory studies allowed to reveal that along with the factors of interfacial tension reduction, oil emulsification, change of rock wettability, interaction of injected alkaline agent with active acid components of high-resin and asphaltene oils plays a significant role in alkaline flooding processes. Production growth is also provided by increasing the sweep efficiency of oil-saturated layers by blocking highly permeable intervals with an adjustable viscoelastic composition. |
| Keywords: Enhanced Oil Recovery, Alkaline Flooding, Gas Generation, Facial Tension, Asphaltene Oils |
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| DOI: https://doi.org/10.54381/itta2024.37 |