NDLI: Numerical Modelling on $CO_{2}$ Storage Capacity in Depleted Gas Reservoirs

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Numerical Modelling on $CO_{2}$ Storage Capacity in Depleted Gas Reservoirs

Content Provider	MDPI
Author	Akai, Takashi Saito, Naoki Hiyama, Michiharu Okabe, Hiroshi
Copyright Year	2021
Abstract	Making an accurate estimate of the CO $_{2}$ storage capacity before the commencement of a carbon capture and storage (CCS) project is crucial to the project design and feasibility investigation. We present herein a numerical modelling study on the CO $_{2}$ storage capacity in depleted gas reservoirs. First, we show a simple volumetric equation that gives the CO $_{2}$ storage capacity in a depleted gas reservoir, which considers the same volume of CH $_{4}$ at reservoir pressure and temperature conditions produced from the reservoir. Next, the validity and the limitations of this equation are investigated using a numerical reservoir simulation with the various reservoir characteristics of reservoir heterogeneity, aquifer water encroachment, and rock compaction and its reversibility. Regardless of the reservoir heterogeneity, if a reservoir is subjected to a weak or moderate aquifer support, the volumetric equation provides an estimate of the CO $_{2}$ storage capacity as structurally trapped gas within 1% of that estimated from numerical simulations. The most significant factor influencing the CO $_{2}$ storage capacity is the reversibility of rock compaction, rather than the degree of rock compaction. If reservoir rocks have a strong hysteresis in their compaction and expansion behaviour, the material balance equation will overestimate the amount of structural CO $_{2}$ trapping. All the simulation results show a fairly consistent amount of trapped CO $_{2}$ as a dissolved component in water, which is 15∼17% of the structurally trapped CO $_{2}$ . Overall, our study presents the validity and the limitation of the simple material balance equation for estimating the CO $_{2}$ storage capacity, which helps with designing a CCS project at the early stage.
Starting Page	3978
e-ISSN	19961073
DOI	10.3390/en14133978
Journal	Energies
Issue Number	13
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-07-02
Access Restriction	Open
Subject Keyword	Energies Petroleum Engineering Carbon Capture and Storage (ccs) Co2 Injection in Depleted Gas Reservoirs Reservoir Hysteresis Compositional Simulation
Content Type	Text
Resource Type	Article

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