Analysis of Reservoir Fluid Migration in the Process of CO 2 Sequestration in a Partially Depleted Gas Reservoir

Wiesław Szott and Krzysztof Miłek
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Wiesław Szott: Department of Hydrocarbon Reservoir and UGS Simulation, Oil and Gas Institute—National Research Institute, Lubicz 25A, 31-504 Krakow, Poland
Krzysztof Miłek: Department of Hydrocarbon Reservoir and UGS Simulation, Oil and Gas Institute—National Research Institute, Lubicz 25A, 31-504 Krakow, Poland

Energies, 2021, vol. 14, issue 19, 1-23

Abstract: This paper addresses problems of reservoir fluid migrations in the process of CO 2 sequestration in a partially depleted petroleum reservoir. A detailed analysis of the migrations is required to obtain fundamental characteristics of a sequestration structure, including estimation of its sequestration capacity and leakage risks. The paper presents a general discussion of the relevant mechanisms and their contributions to the analysed issues. The proposed approach to solve the problems relies on the usage of numerical structure modelling and simulations of the sequestration processes on numerical models of the structure. It is applied to a selected geological structure comprising a partially depleted gas reservoir. The modelling includes key types of reservoir fluid migrations: viscous multiphase transport and convection transport. It also takes into account other phenomena that affect fluid migrations including injected gas solubility in the formation water and gas trapping by capillary forces. Correspondingly, the leakage risks are associated with distinct leakage pathways (beyond the structural trap, to the caprock, via activated fractures). All these cases are separately modelled and their detailed characteristics are presented and discussed. The final results of the fluid migrations and their consequences for the leakage events are discussed and some generalized conclusions are drawn from the approach employed in the study.

Keywords: numerical modelling; reservoir simulations; reservoir fluid migrations; CO 2 sequestration; sequestration capacity; leakage risk analysis (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: 2021
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