Scale Formation in Porous Media and its Impact on Reservoir Performance During Water Flooding

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Abedi, Emad | 2020

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 53039 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Masihi, Mohsen; Taghikhani, Vahid; Ghazanfari, Mohammad Hossein
Abstract:
Mineral scale precipitation and carbonate rock dissolution are among the most important reactions that usually occur during water injection in oil reservoirs. These reactions happen due to incompatibility between formation water and injection water as well as deviation from equilibrium conditions. These reactions must be considered precisely because of the fact that they result in variation of reservoir porosity and permeability which affects recovery factor. In this study, the effect of injection pressure on these variations during single-phase water flooding is examined accurately. Additionally, the changes of ion concentration and the amount of dissolved or precipitated calcite or dolomite are also shown in the results. For this purpose, a coupled model has been used, by a combination of two computer softwares, a geochemical simulator called PHREEQC and MATLAB. Based on the results obtained in this study, injection of water with specified composition results in porosity and permeability increase. Additionally, increasing injection pressure lead to the increase of porosity and permeability variation
Keywords:
Water Injection ; Precipitation ; Dissolution ; Mineral Precipitation ; PHREEQC Software ; Scale Formation

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