Salt precipitation during geological sequestration of supercritical CO2 in saline aquifers: A pore-scale experimental investigation

Akindipe, Dayo; Saraji, Soheil; Piri, Mohammad

doi:10.1016/j.advwatres.2021.104011

Cited by 26 publications

(9 citation statements)

References 46 publications

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“…(a) Two-dimensional slices of the Prairie Shell limestone pore and mineral maps. Reproduced with permission from ref Akindipe et al Copyright 2022 Elsevier. (b) Pore-size distribution of the five core samples used in this study.…”

Section: Methodsmentioning

confidence: 99%

Carbonated Water Injection in Oil-Wet Carbonate Rock Samples: A Pore-Scale Experimental Investigation of the Effect of Brine Composition

2022

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Research into the application of carbonated water injection (CWI) for oil recovery has primarily focused on sandstone reservoirs. Therefore, characteristic pore-scale mechanisms that principally depend on the injected brine composition in oil-wet carbonates are still poorly understood. This study uses a pore-scale approach that incorporates core flooding with microcomputed tomography (micro-CT) imaging to investigate underlying mechanisms during CWI with different brine compositions and salinities in oil-wet carbonate rocks. The results reveal that mere carbonation of brine deficient in potential determining ions (PDIs)Ca 2+ , Mg 2+ , and SO 4 2− does not improve the oil displacement efficiency in oil-wet carbonates. Particularly, certain pore-scale phenomenawettability reversal and interfacial tension (IFT) reductionthat control the oil displacement efficiency do not significantly change toward desirable states. Extant oil-wet conditions were maintained as we observed a marginal reduction in the average in situ contact angle. In addition, the equilibrium oil−brine IFT was similar to that of oil−brine systems characterized by high brine salinity. Contrarily, enriching low-salinity seawater, containing definite amounts of PDIs, with CO 2 promoted superior oil recovery within all pore-size groups with an overall incremental value as high as 24%. This enhanced performance was evidenced by a dominance of wettability reversal to near-neutral states, which created a more favorable capillary pressure required for pore-level displacements. Wettability alteration originated from the reduction in electrostatic attraction between oil−brine and brine−rock interfaces through surface adsorption of SO 4 2− ions in low-pH environments. These observations establish wettability reversal aided by PDIs as the overriding pore-scale oil-recovery mechanism in oil-wet carbonates during CWI.

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Section: Methodsmentioning

confidence: 99%

Carbonated Water Injection in Oil-Wet Carbonate Rock Samples: A Pore-Scale Experimental Investigation of the Effect of Brine Composition

2022

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“…35 The time and extent of salt precipitation are influenced by the rate of CO 2 injection and heterogeneity of the porous medium. 38 The exact type of salt that will form depends on various factors such as the mineralogy of the formation rock, the composition of the injected CO 2 , and the properties of the brine. Nonetheless, the types of salt that are likely to be formed include carbonates, bicarbonates, sulfates, and chlorides.…”

Section: Injectivity Impairmentmentioning

confidence: 99%

“…A total of eight groups of sandpack flooding experiments were carried out. The average porosity and permeability of the sandpack were 38 mD. For each test, foam quality, CO 2 injection rate, and surfactant injection rate were different.…”

Section: Injection Of Surfactant Foam With Npsmentioning

confidence: 99%

Minireview on CO₂ Storage in Deep Saline Aquifers: Methods, Opportunities, Challenges, and Perspectives

Mim,

Negash,

Jufar

et al. 2023

Energy Fuels

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“…The injectivity of CO 2 is an essential indicator in CO 2 geological storage. The decrease in injectivity caused by salt precipitation is more serious near the injection well (Bacci, 2011;Grude et al, 2014;Piao et al, 2018;Akindipe et al, 2021;Norouzi et al, 2022). CO 2 geological storage projects such as Ketzin (Baumann et al, 2014) and Snøhvit (Grude et al, 2014) have found the problem of poor injectivity caused by salt precipitation.…”

Section: Introductionmentioning

confidence: 99%

The influence of heterogeneous structure on salt precipitation during CO2 geological storage

He¹,

Jiang

2023

Adv. Geo-Energy Res.

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The presence of rock heterogeneity and fractures may cause abrupt spatial changes in capillary action and flow characteristics, which eventually change the precipitation behavior during CO 2 geological storage. Therefore, the salt precipitation mechanism of the heterogeneous structure needs to be studied. In this paper, the salt precipitation behavior in different heterogeneous structures was studied through pore-scale experiments at room temperature and atmospheric conditions. In the up-down heterogeneous structure, the salt precipitation has little effect on the injectivity regardless of the CO 2 injection rate. When the CO 2 injection rate is low, the salt tends to precipitate in situ in the small pore structure to form a crystal structure. When the CO 2 injection rate is high, the salt tends to precipitate in the large pore structure to form a cluster structure. In the left-right heterogeneous structure, regardless of the CO 2 injection rate, the precipitated salt is mainly in the cluster structure, and the salt is more dispersed in distribution, the impact on injectivity is small. The injection well can be selected in the formation with strong heterogeneity, to alleviate the blockage caused by salt precipitation. When CO 2 leaks in the fractures, salt tends to grow until the fracture is plugged, which is of great significance for the self-healing of the fracture for the caprock.

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Salt precipitation during geological sequestration of supercritical CO2 in saline aquifers: A pore-scale experimental investigation

Cited by 26 publications

References 46 publications

Carbonated Water Injection in Oil-Wet Carbonate Rock Samples: A Pore-Scale Experimental Investigation of the Effect of Brine Composition

Carbonated Water Injection in Oil-Wet Carbonate Rock Samples: A Pore-Scale Experimental Investigation of the Effect of Brine Composition

Minireview on CO₂ Storage in Deep Saline Aquifers: Methods, Opportunities, Challenges, and Perspectives

The influence of heterogeneous structure on salt precipitation during CO2 geological storage

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Salt precipitation during geological sequestration of supercritical CO2 in saline aquifers: A pore-scale experimental investigation

Cited by 26 publications

References 46 publications

Carbonated Water Injection in Oil-Wet Carbonate Rock Samples: A Pore-Scale Experimental Investigation of the Effect of Brine Composition

Carbonated Water Injection in Oil-Wet Carbonate Rock Samples: A Pore-Scale Experimental Investigation of the Effect of Brine Composition

Minireview on CO2 Storage in Deep Saline Aquifers: Methods, Opportunities, Challenges, and Perspectives

The influence of heterogeneous structure on salt precipitation during CO2 geological storage

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Minireview on CO₂ Storage in Deep Saline Aquifers: Methods, Opportunities, Challenges, and Perspectives