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Convective-Reactive Transport and Unstable Density-Driven Flow in Fractured Porous Media
, M.Sc. Thesis Sharif University of Technology ; Ataie-Ashtiani, Behzad (Supervisor)
Abstract
The goal of this study is to explore the density-driven flow and study the effect of fracture as well as chemical processes and reactions on convective transport. Convective flow is used in connection with the density-driven flow where the flow is driven by density differences in the fluid, which can be affected by the ambient rocks. Several studies of density-driven flow in porous media have focused on the effect of heterogeneity on the mixing convection; however, they neglect the key processes of geochemical reactions in fractured porous media. This study aims to address this gap by investigating the combined effect of heterogeneity (as fractures) and the existing geochemical reactions on...
Core-scale Mechanistic Simulation of Engineered Salinity Waterflooding Using Bond-Product-Sum Method
, M.Sc. Thesis Sharif University of Technology ; Mahani, Hassan (Supervisor)
Abstract
Considering the world's diminishing oil reserves, as well as the growing demand for oil and energy consumption, Enhanced Oil Recovery (EOR) techniques are becoming increasingly important in the attempt to improve oil production. Engineering salinity waterflooding has gained widespread attention and popularity in the last two decades due to its environmental friendliness, lack of expensive additives, low operating costs, and ease of use as an oil extraction process. The goal of this study is to use an innovative method to develop a mechanistic approach model that simulates and forecasts the mechanism and performance of the engineered water flooding process. Wettability alteration, the most...
A coupled geochemical and fluid flow model to simulate permeability decline resulting from scale formation in porous media
, Article Applied Geochemistry ; Volume 107 , 2019 , Pages 131-141 ; 08832927 (ISSN) ; Kalantariasl, A ; Abbasi, S ; Shahrabadi, A ; Aghaei, H ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Scale precipitation due to the mixing of incompatible injected water with formation brine and its subsequent deposition in porous media is an unpleasant phenomenon in water injection projects that can lead to severe injectivity and productivity decline. As a result of the complexity of geochemical reactions, modelling scale precipitation and deposition is a challenge. This paper presents a coupled geochemical and fluid flow model to simulate reactive flow in porous media which models pressure difference increase resulting from scale formation during water injection into porous media. To simulate chemical reactions during scale formation and subsequent rock permeability decline, PHREEQC...
Detailed analysis of the brine-rock interactions during low salinity water injection by a coupled geochemical-transport model
, Article Chemical Geology ; Volume 537 , 2020 ; Zivar, D ; Sharif University of Technology
Elsevier B.V
2020
Abstract
Enhanced Oil Recovery (EOR) methods have been widely used around the world to improve oil production from petroleum reservoirs. Recently, the injection of the low salinity/smart water has gained popularity among the EOR methods. Different mechanisms are believed to exist during low salinity/smart water injection, including dissolution, precipitation, and ion exchange at the rock surface. In this study, a coupled geochemical-transport model is presented for the detailed analysis and investigation of the interactions between brine, sandstone and carbonate rocks. The proposed model presents the coupling of a geochemical software (PHREEQC) and a species transport model. This coupled method makes...
Convective-reactive transport of dissolved CO2 in fractured-geological formations
, Article International Journal of Greenhouse Gas Control ; Volume 109 , 2021 ; 17505836 (ISSN) ; Ataie Ashtiani, B ; Simmons, C. T ; Younes, A ; Fahs, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Carbon dioxide (CO2) storage in geologic formations is an attractive means of reducing greenhouse gas emissions. The main processes controlling the migration of CO2 in geological formations are related to convective mixing and geochemical reactions. The effects of heterogeneity on these coupled processes have been widely discussed in the literature. Recently, special attention has been devoted to fractured geological formations that can be found in several storage reservoirs. However, existing studies on the effect of fractures on the fate of CO2 neglect the key processes of geochemical reactions. This work aims at addressing this gap. Based on numerical simulations of a hypothetical...
CO2 storage in carbonate rocks: An experimental and geochemical modeling study
, Article Journal of Geochemical Exploration ; Volume 234 , 2022 ; 03756742 (ISSN) ; Zhao, Y ; An, Z ; Shabani, A ; Sharif University of Technology
Elsevier B.V
2022
Abstract
Carbon dioxide storage in geological formations is one of the mature strategies developed for controlling global warming. This paper represents a comprehensive experimental and geochemical modeling study to analyze CO2-brine-rock interactions in a carbonate rock containing calcite and dolomite minerals. PHREEQC geochemical package has been applied for modeling the geochemical reactions in the studied porous media. Firstly, dynamic experiments are performed to calibrate the geochemical model. Then, static experiments are conducted to study the geochemical reactions in the CO2-brine-rock interaction system. This study contributes to analyzing the precipitation-dissolution and ion exchange...