Geochemical Study of Utilizing Co2 as a Cushion Gas in Porous Aquifer Compressed Energy Storage Systems

Iloejesi, Chidera; Beckingham, Lauren E.

doi:10.1130/abs/2021se-362383

Cited by 1 publication

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Utilizing CO 2 as a cushion gas compressed energy storage in porous formations introduces new uncertainties in terms of the reactivity between the injected gas and surrounding matrix. Earlier reactive transport simulations have suggested that the extent of reactions between injected CO 2 , brine, and formation minerals will be limited in compressed energy storage system in comparison to geologic CO 2 sequestration (Iloejesi and Beckingham, 2021). Here, variations in operational regime on geochemical reactions at the plume boundary have been explored.…”

Section: Discussionmentioning

confidence: 99%

“…Previous reactive transport simulations have considered the impact of cyclic flow conditions on geochemical reactions in energy storage systems in a porous saline aquifer. These simulations have shown that the rate and extent of potential dissolution and precipitation reactions at three locations in the formation are significantly reduced in the energy storage system in comparison to what is anticipated in geologic CO 2 sequestration system (Iloejesi and Beckingham, 2021). While this result is promising, the study only considered a 4 month operational period with constant injection and extraction cycling.…”

Section: Introductionmentioning

confidence: 93%

“…Reactive transport simulations to understand the geochemical evolution of the reservoir in the brine-saturated region surrounding the gas plume were developed here for energy storage systems using CO 2 as a cushion gas. Here, the initial simulations developed in Iloejesi and Beckingham (2021) are extended to consider two storage operational schedules for 15 years. Simulations were developed in CrunchFlow, a multispecies reactive transport simulation code (Steefel and Molins, 2009).…”

Section: Reactive Transport Simulationsmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Storage Period on the Geochemical Evolution of a Compressed Energy Storage System

Iloejesi

Beckingham

2021

Front. Water

View full text Add to dashboard Cite

Subsurface porous aquifers are being considered for use as reservoirs for compressed energy storage of renewable energy. In these systems, a gas is injected during times in which production exceeds demand and extracted for energy generation during periods of peak demand or scarcity in production. Current operational subsurface energy facilities use salt caverns for storage and air as the working gas. CO2 is potentially a more favorable choice of working gas where under storage conditions CO2 has high compressibility which can improve operational efficiency. However, the interaction of CO2 and brine at the boundary of the storage zone can produce a chemically active fluid which can result in mineral dissolution and precipitation reactions and alter the properties of the storage zone. This study seeks to understand the geochemical implications of utilization of CO2 as a working gas during injection, storage and extraction flow cycles. Here, reactive transport simulations are developed based on 7 h of injection, 11 h of withdrawal and 6 h of reservoir closure, corresponding to the schedule of the Pittsfield field test, for 15 years of operational life span to assess the geochemical evolution of the reservoir. The evolution in the storage system is compared to a continuously cyclic system of 12 h injection and extraction. The result of the study on operational schedule show that mineral reactivity occurs at the inlet of the domain. Furthermore, the porosity of the inner domain is preserved during the cycling of CO2 acidified brine for both systems.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Reactive Transport Simulationsmentioning

confidence: 99%

See 1 more Smart Citation