Effect of sub-/super-critical CO2 and brine exposure on the mechanical and acoustic emission characteristics of shale

Zhou, Junping; Tian, Shifeng; Zhou, Lei; Xian, Xuefu; Zhang, Chengpeng; Yang, Kailun; Dong, Zhiqiang; Lu, Zhaohui

doi:10.1016/j.jngse.2021.103921

Cited by 32 publications

(11 citation statements)

References 67 publications

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“…The mechanical weakening of shale also confirmed by the crack initiation stress and crack damage stress obtained by acoustic emission (AE) analysis during the compressive strength test process. AE analysis indicated that CO 2 exposure can not only reduce the peak strength of shale samples, but also decrease the threshold of crack initiation and damage stress of shale. ,,,, The fractal characteristics of AE signals also indicated that the deformation and fracture behavior of shale after CO 2 exposure become more complex and irregular in the compression process. ,,, …”

Section: Alterations In Physical and Chemical Properties Of Shalementioning

confidence: 97%

“…62,150,151,155,156 The fractal characteristics of AE signals also indicated that the deformation and fracture behavior of shale after CO 2 exposure become more complex and irregular in the compression process. 49,149,153,156 Figure 7 presents the normalized tensile strength alterations of shale with the CO 2 exposure time. The variation of the tensile strength of shale after CO 2 exposure shows trends similar to those of the UCS and E. ScCO 2 induces more significant weakening in the tensile strength of shale than SubCO 2 , and the weakening of the tensile strength in shale increases gradually with increasing CO 2 exposure time.…”

Section: Adsorption Behaviormentioning

confidence: 99%

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Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

et al. 2022

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CO2–shale interaction performs a crucial role in determining the capacity and leakage risk of CO2 storage in shale reservoirs. In this paper, the alterations of physical and chemical properties of shale triggered by CO2–shale interaction are reviewed, and then the implications for CO2 sequestration in shale formations are discussed. CO2–shale interaction induced the mineral alterations in shale and then further induced the pore structure alterations. The pore structure alterations are mainly controlled by mineral dissolution/precipitation and extraction and CO2 adsorption induced swelling in shale, which is closely related to the reservoir pressures and temperatures. Furthermore, the mineral and pore structure alterations may also influence the wetting behavior of shale. After CO2 exposure, the contact angle of shale increased, indicated the weakening in the hydrophilicity of the shale surface. The microscopic property alterations induced the macroscopic mechanical properties of shale to be weakened after CO2–shale interaction. The permeability variation of shale is significantly influenced by chemical–mechanical coupling effects including mineral dissolution/precipitation, adsorption induced swelling, wettability, and mechanical weakening induced by CO2–shale interaction. The shale property alterations will ultimately affect the CO2 storage capacity and security in shale. Future research needs to focus on the CO2–shale interaction covering multiple spatial and temporal scales at in situ conditions and considering the chemical–mechanical coupling effect on CO2 sequestration in shale.

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Section: Alterations In Physical and Chemical Properties Of Shalementioning

confidence: 97%

Section: Adsorption Behaviormentioning

confidence: 99%

Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

et al. 2022

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“…For monitoring the fracturing process like fracture initiation, propagation and closure in the specimen, acoustic emission (AE) a nondestructive testing tool is used when shale specimens are under compressive load. ,,, After fracturing, the study of the morphology of fracture network created by Sc-CO 2 a nondestructive high-energy computed tomography (CT), digital radiography (DR) (applicable when specimen breaks into 2 pieces) used for visual observation of fracture surface, type, and propagation. , While Stylus and Optical Profilometry define the roughness and complexity of fracture. Moreover, to estimate the permeability variation after fracturing pulse decay method was used. , …”

Section: Sc-co2 Fracturing Characterization Of the Shale Rock Samplesmentioning

confidence: 99%

“…Pore structure and mineral content plays key role in controlling the mechanical strength of rock as pore structure and mineral content alters with geochemical reaction as mentioned above which effect mechanical strength of rock . Exposure of shale to Sc-CO 2 and water for particular duration of time decrease compressive strength, young’s modulus (E) and increases poisons ratio (v), this deteriorates shale brittleness after soaking with water or Sc-CO 2 . Moreover, when the pressure increases, the density of CO 2 and its solubility in water increased.…”

Section: Interaction Of Sc-co2 With Shalementioning

confidence: 99%

“…86 Exposure of shale to Sc-CO 2 and water for particular duration of time decrease compressive strength, young's modulus (E) and increases poisons ratio (v), this deteriorates shale brittleness after soaking with water or Sc-CO 2 . 94 Moreover, when the pressure increases, the density of CO 2 and its solubility in water increased. This resulted in a decrease in solution pH and a rise in the dissolving of shale's inorganic minerals, which caused more substantial damage and a subsequent decrease in triaxial compressive strength (TCS) which is opposite with variation in temperature.…”

Section: Kalsimentioning

confidence: 99%

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Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Gupta,

Verma

2023

Energy Fuels

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Hydraulic fracturing has completely revolutionized how shale resources are exploited to extracthydrocarbons. However, sustainability and environmental issues have fueled the desire for alternate fracturing technologies. Supercritical carbon dioxide (Sc-CO2) fracturing is a new method that uses high-pressure, high-temperature CO2 in its supercritical state (7.38 MPa and 31.1 °C) to generate fractures in shale formations, thereby increasing reservoir permeability. This Review thoroughly analyzes the effects of Sc-CO2 on shale reservoirs during the fracturing process, including the factors that affect fracture breakdown pressure and the complexity and roughness of fracture induced by Sc-CO2. Sc-CO2 can fracture rock at a fracturing pressure lower than that of slick water. CO2, in its supercritical state, shows strong permeability, low viscosity, and extremely low surface tension, like gas, because of which it can infiltrate any space larger than its kinetic diameter (0.330 nm). Many research investigations illustrate how Sc-CO2 affects shales with diverse pore structures, mineral compositions, and mechanical properties when exposed to Sc-CO2 for several hours to days. It is challenging to effectively store CO2 in shale gas reservoirs due to their low permeability and limited storage capacity. To improve the effectiveness of CO2 storage, shale can be fractured to increase the pore space and surface area in reservoirs. Thereby, a certain amount of the CO2 pumped for shale gas production can be securely stored in shale formations, reducing carbon emissions and allowing for a zero-carbon footprint. This paper discusses the pathway and different chemical reactions involved in the storage of CO2 after fracturing over a period. However, fully understanding the interactions between Sc-CO2 and shale rock and the possibility of long-term storage of CO2 in shale formations is quite challenging. It is because of a lack of research and limited knowledge in the above field. Hence, more investigation and development are required in the research area of Sc-CO2 fracturing and the interaction of CO2 with shale rock.

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Influence of Supercritical Carbon Dioxide at Various Temperatures on Shale Mechanical Properties

Ge,

Yao,

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Effect of sub-/super-critical CO2 and brine exposure on the mechanical and acoustic emission characteristics of shale

Cited by 32 publications

References 67 publications

Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Influence of Supercritical Carbon Dioxide at Various Temperatures on Shale Mechanical Properties

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Effect of sub-/super-critical CO2 and brine exposure on the mechanical and acoustic emission characteristics of shale

Cited by 32 publications

References 67 publications

Comprehensive Review of Property Alterations Induced by CO2–Shale Interaction: Implications for CO2 Sequestration in Shale

Comprehensive Review of Property Alterations Induced by CO2–Shale Interaction: Implications for CO2 Sequestration in Shale

Supercritical Carbon Dioxide Utilization for Hydraulic Fracturing of Shale Reservoir, and Geo-Storage: A Review

Influence of Supercritical Carbon Dioxide at Various Temperatures on Shale Mechanical Properties

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Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale