Dynamic Evaluation Method of Caprock Microscopic Sealing in CO<sub>2</sub> Sequestration Project

Han, Xu; Feng, Fuping; Cong, Ziyuan

doi:10.1155/2020/2648692

Cited by 3 publications

(1 citation statement)

References 24 publications

(24 reference statements)

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“…The HSGC of shale-mudstone interface after 200 years is presented in Figure 10, and the result shows that HSGCs are all greater than 800 m. The pore size of the shale-mudstone interface above the injection well increases; thus, HSGCs are smaller than those of the above production well. According to the evaluation index in Table 6 [35], generally, HSGC of the mudstone layer can be classified as level II. For maintaining the high sealing performance of caprock in the period of CO 2 geological sequestration, it is crucial to take breakthrough pressure into consideration before site selection.…”

Section: 3mentioning

confidence: 99%

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

Yan

et al. 2021

Lithosphere

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Recently, CO2 geological sequestration combined with enhancing deep saline water/brine recovery is regarded as a potential strategic choice for reduction of CO2 emissions. This technology not only achieves the relatively secure storage of CO2 which was captured during industrial processes but also can enhance the recovery of water for drinking, industrial, and agricultural utilization. However, the impact of CO2-water-rock reactions on the shale reservoir in the system is unclear and the sealing performance of mudstone caprock has not been investigated. For analyzing the mechanism of mineral alteration in the shale reservoir, a three-dimensional injection-production model in the double-fractured horizontal well pattern is established according to actual parameters of shale and mudstone layers. In addition, mineral alteration was characterized and caprock sealing performance was also assessed. Numerical results showed that the presence of CO2 can lead to the dissolution of k-feldspar, oligoclase, chlorite, and dolomite and the precipitation of clay minerals such as kaolinite, illite, and smectite (Ca-smectite and Na-smectite). Due to positive ion released by dissolved primary minerals, the precipitation of secondary carbonate occurs including ankerite and dawsonite, which induces the mineral sequestration capacity of the shale reservoir. The amount of CO2 sequestration by mineral is 51430.96 t after 200 years, which equals 23.47% of the total injection (219145.34 t). Besides, the height of the sealing gas column is used for evaluating the sealing performance of the shale-mudstone interface. Results show that the height of the sealing gas column at the interface above the injection well is lower but the maximum value of CO2 gas saturation is only 0.00037 after 200 years. The height of the sealing gas column at the interface is greater than 800 m, which can be classified as level II and guarantee the security of the CO2 storage. The analysis results provide reliable guidance and reference for the site selection of CO2 geological sequestration.

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Section: 3mentioning

confidence: 99%

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

Yan

et al. 2021

Lithosphere

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A quantitative approach for sealing capacity evaluation of caprock in candidate of aquifer gas storage

Jia

Wen

et al. 2023

Environ Sci Pollut Res

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Mass Transfer Analysis of CO2-Water-Rock Geochemical Reactions in Reservoirs

et al. 2023

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It is difficult to exploit low-permeability reservoirs, and CO2 flooding is an effective method to improve oil recovery from low permeability reservoirs. However, in the process of CO2 flooding, acidic fluids dissolved in formation water will react with rock to cause dissolution and precipitation, resulting in pores and precipitates, changing the evolution law of seepage channels, destroying formation integrity, and affecting the effect of CO2 oil displacement. The change in rock’s physical properties and the mass transfer law between CO2-water-rock are unclear. This paper considers the coupling effects of seepage, mechanics, and chemistry when CO2 is injected into the formation. The mass transfer model of CO2-water-rock in the geochemical reaction process is established on this basis. The physical properties of the reservoir after CO2 injection are quantitatively studied based on the microscopic mechanism of chemical reaction, and the migration law of solute in the reservoir rock during CO2 flooding under the coupling effects of multiple fields is clarified. The experimental results show that with the increase in reaction time, the initial dissolution reaction of formation rocks will be transformed into a precipitation reaction of calcite, magnesite, and clay minerals. The porosity and permeability of the rocks near the well first increase and then decrease. The far well end is still dominated by dissolution reactions, and the average values of formation porosity and permeability show an upward trend. Although the dissolution reaction of CO2-water-rock can improve the physical properties of reservoir rocks to a certain extent, the mutual transformation of the dissolution reaction and precipitation reaction further exacerbates the heterogeneity of formation pore structure, leading to the instability of CO2 migration, uneven displacement, and destruction of formation stability. The research results of this paper solve the problem of quantitative calculation of physical parameters under the coupling effect of multiple fields after CO2 injection into reservoirs and can predict the changes in formation physical properties, which can provide a certain theoretical basis for evaluating formation integrity and adjusting CO2 injection under the condition of CO2 flooding.

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Dynamic Evaluation Method of Caprock Microscopic Sealing in CO₂ Sequestration Project

Cited by 3 publications

References 24 publications

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

A quantitative approach for sealing capacity evaluation of caprock in candidate of aquifer gas storage

Mass Transfer Analysis of CO2-Water-Rock Geochemical Reactions in Reservoirs

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Dynamic Evaluation Method of Caprock Microscopic Sealing in CO2 Sequestration Project

Cited by 3 publications

References 24 publications

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

Numerical Modeling Study on Mineral Alteration and Sealing Performance for CO2 Geological Sequestration with Enhancing Water Recovery in Hydraulic Fractured Shale Reservoirs

A quantitative approach for sealing capacity evaluation of caprock in candidate of aquifer gas storage

Mass Transfer Analysis of CO2-Water-Rock Geochemical Reactions in Reservoirs

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Dynamic Evaluation Method of Caprock Microscopic Sealing in CO₂ Sequestration Project