Wellbore and Reservoir Thermodynamic Appraisal in Acid Gas Injection for EOR Operations

Anna Samnioti (), Eirini Maria Kanakaki, Evangelia Koffa, Irene Dimitrellou, Christos Tomos, Paschalia Kiomourtzi, Vassilis Gaganis and Sofia Stamataki
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Anna Samnioti: School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece
Eirini Maria Kanakaki: School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece
Evangelia Koffa: School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece
Irene Dimitrellou: School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece
Christos Tomos: Energean, Kifissias Avenue 32, Atrina Center, 15125 Athens, Greece
Paschalia Kiomourtzi: Energean, Kifissias Avenue 32, Atrina Center, 15125 Athens, Greece
Vassilis Gaganis: School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece
Sofia Stamataki: School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780 Athens, Greece

Energies, 2023, vol. 16, issue 5, 1-26

Abstract: This study provides insights into the experience gained from investigating the thermodynamic behavior of well and reservoir fluids during acid gas injection (AGI) in a hydrocarbon field to enhance oil recovery (EOR) and to reduce greenhouse gas emissions. Unlike conventional water and natural gas injection, AGI involves complicated phase changes and physical property variations of the acid gas and reservoir fluids at various pressure-temperature (P-T) conditions and compositions, and both constitute crucial parts of the EOR chain. A workflow is developed to deal with the reservoir fluid and acid gas thermodynamics, which is a key requirement for a successful design and operation. The workflow focuses firstly on the development of the thermodynamic models (EoS) to simulate the behavior of the reservoir fluids and of the injected acid gas and their integration in the field and in well dynamic models. Subsequently, the workflow proposes the thermodynamic simulation of the fluids’ interaction to determine the Minimum Miscibility Pressure (MMP), yielding the dynamic evolution of the fluids’ miscibility that may appear within the reservoir. Flow assurance in the acid gas transportation lines and in the wellbore is also considered by estimating the hydrate formation conditions.

Keywords: acid gas; EOR; EoS models; miscibility; hydrates (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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