Influence of supercritical, liquid, and gaseous CO<sub>2</sub> on fracture behavior in sandstone

Sun, Zedong; Song, Xiaojie; Gui, Feng; Huo, Yuming; Wang, Zhong‐Lun; Kong, Shaoqi

doi:10.1002/ese3.736

Cited by 5 publications

(4 citation statements)

References 69 publications

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“…This reduction is in a good agreement with our results. Similarly, Sun et al (2020), who also explored the effects of CO 2 on mechanical properties, found that when exposed to pressurized CO 2 reservoirs at 6-8 MPa for 30 days, the fracture toughness of sandstone decreases by 11.01%-27.89% compared to that of dry sandstone.…”

Section: Fracture Toughnessmentioning

confidence: 97%

Corrosive Influence of Carbon Dioxide on Crack Initiation in Quartz: Comparison With Liquid Water and Vacuum Environments

Simeski

Ihme

2023

JGR Solid Earth

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The stimulation of crack growth in quartz and siliceous materials by injecting carbon dioxide (CO2) represents a key technology in long‐term carbon storage and in the development of natural gas wells. While this technology is widely used, the molecular impact of CO2 interactions on the solid matrix is only incompletely understood. In this work, we employ reactive molecular dynamics simulations to study how the CO2 fluid environment affects the mechanical properties of pre‐cracked single‐crystal quartz. The thermodynamic conditions of interest are those relevant to subsurface reservoirs. We report how structural properties of quartz—bond length distribution and crack tip shape—evolve upon introduction of a fluid. These properties are directly related to macroscopic quantities of the global stress–strain curves, thus reaffirming the inherent coupling across multiple scales for fluid–solid interactions in the subsurface. We find that CO2 reduces the fracture toughness of quartz by 12.1% compared to that of quartz in vacuum, thereby promoting crack growth and enhancing fluid transport in the subsurface.

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Section: Fracture Toughnessmentioning

confidence: 97%

Corrosive Influence of Carbon Dioxide on Crack Initiation in Quartz: Comparison With Liquid Water and Vacuum Environments

Simeski

Ihme

2023

JGR Solid Earth

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“…This changes the ability of rocks to resist fracture failure. SEM is used to observe the microscopic structure of rocks in experimental research [32,33]. Therefore, this study applied SEM to observe the granite under different temperatures.…”

Section: Discussionmentioning

confidence: 99%

Influence of Temperature on Quantification of Mesocracks: Implications for Physical Properties of Fine-Grained Granite

Zhu¹,

Lin²,

Gui³

et al. 2021

Lithosphere

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Thermally induced changes in mesocrack and the physical properties of fine-grained granite may influence their stability, transport characteristics, and performance related to various deep subsurface energy projects. In this study, granite was heat-treated at different temperatures (20°C, 100°C, 200°C, 300°C, 400°C, 500°C, and 600°C). The propagation and evolution of different types of cracks and the physical properties of the granite were quantitatively investigated, using optical observations of petrographic thin sections, P-wave velocity measurements, and permeability tests. The results show that as the temperature increased, the number and length of cracks increased, and the cracks were randomly distributed in all directions. This led to an increase in rock damage (λn) and an increase in permeability (K). In particular, when the temperature was ≥400°C, the damage rate significantly increased, and the number and length of intragranular cracks significantly exceeded the number and length of intergranular cracks. This led to changes in the permeation path, causing it to mainly travel through the interior of mineral particles. Using the inverse of P-wave velocity (VP), the dimensionless crack density (ρ) of granite was found to increase as the temperature increased, and this result was similar to the change of optical crack density (Pl). These analyses laid a reference for understanding the correlation between microcrack characteristics and macrophysical properties of granite.

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“…Many researchers [16][17][18][19][20][21][22][23][24][25] studied the chemical reactions of CO 2 -sandstone-brine under the supercritical condition of CO 2 . Tey found that scCO 2 corroded the mineral surface and disrupted the original pore structure.…”

Section: Chemical Reaction Between Scco 2 and Minerals In Sandstonementioning

confidence: 99%

Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale

Zhang

Yan

Yang

et al. 2023

Advances in Materials Science and Engineering

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Conventional hydraulic fracturing techniques typically consume large amounts of water when producing shale gas. Fracking fluids may cause environmental pollution. In contrast, supercritical carbon dioxide (scCO2) (above 31.8°C, 7.29 MPa) can displace CH4 in shale reservoirs. Achieve CO2 sequestration while increasing the shale gas production. We studied the mechanical properties and fracture characteristics of a shale under the action of scCO2, nitrogen, helium, and water by comparing the triaxial compression tests of shale samples with seven coring angles. The results show that: (1) scCO2 effectively reduced compressive strength of the shale and weakened the anisotropy of shale; (2) scCO2 caused the content of dolomite, calcite, and illite to decrease by 4.7%∼13.5%, respectively; (3) scCO2 produced micropores and microfractures 10 times larger than the original size in the microstructure. These microstructures can help improve the seepage and gathering of shale gas, leading to enhanced shale gas recovery and CO2 storage.

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Influence of supercritical, liquid, and gaseous CO₂ on fracture behavior in sandstone

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 5 publications

References 69 publications

Corrosive Influence of Carbon Dioxide on Crack Initiation in Quartz: Comparison With Liquid Water and Vacuum Environments

Corrosive Influence of Carbon Dioxide on Crack Initiation in Quartz: Comparison With Liquid Water and Vacuum Environments

Influence of Temperature on Quantification of Mesocracks: Implications for Physical Properties of Fine-Grained Granite

Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale

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Influence of supercritical, liquid, and gaseous CO2 on fracture behavior in sandstone

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 5 publications

References 69 publications

Corrosive Influence of Carbon Dioxide on Crack Initiation in Quartz: Comparison With Liquid Water and Vacuum Environments

Corrosive Influence of Carbon Dioxide on Crack Initiation in Quartz: Comparison With Liquid Water and Vacuum Environments

Influence of Temperature on Quantification of Mesocracks: Implications for Physical Properties of Fine-Grained Granite

Experimental Study on the Effect of Supercritical CO2 on Mechanical Properties and Fracture Characteristics of Longmaxi Shale

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Influence of supercritical, liquid, and gaseous CO₂ on fracture behavior in sandstone