Modelling of gas-driven fracturing and fragmentation in liquid CO2 blasting using finite-discrete element method

Wang, Ben; Li, Haibo; Xing, Haozhe; Li, Xiaofeng

doi:10.1016/j.enganabound.2022.08.041

Cited by 20 publications

(3 citation statements)

References 65 publications

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“…The fractal dimension of the fragments exhibited a continuous upward trajectory, escalating from 2.131 at 5 MPa to 2.539 at 10 MPa, with a diminishing slope. These results align with the observations made by Wang et al, who identified a negative logarithmic function of fractal dimension to rock fragments and the blasting pressure during liquid CO 2 phase-change fracturing. Building upon this prior research, an exponential fitting analysis was conducted, revealing a correlation coefficient of 0.986, which provided the most optimal fit for the data.…”

Section: Resultssupporting

confidence: 92%

Comparative Experimental Study of Fracture Mechanisms and Characteristics of Coal-like Materials under Quasi-Static and High-Pressure Air Blasting Fracturing

Wang,

Zhai,

Shao

et al. 2023

Energy Fuels

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High-pressure air blasting is a burgeoning technique for anhydrous fracturing. A crucial prerequisite for the application of air blasting is to comprehend the distinctions between air blasting and quasi-static fracturing, as well as the change in fracture control factors with variations in blasting pressure. This research undertook experiments on coal-like material specimens with quasistatic fracturing and blasting fracturing with blast pressures ranging from 5 to 10 MPa, by utilizing a self-designed air fracturing experimental system. The fracturing mechanism and characteristics of specimens subjected to different loading conditions were analyzed using a pressure sensor, high-speed camera, and fractal theory. The following primary findings were obtained: The average fracture pressure under quasi-static loading was 3.269 MPa, exhibiting similar absolute deviations. The pressure−time curve of blast fracturing was found to undergo four distinct stages: pressure surge, pressure fallback, pressure maintenance, and pressure plummet. The duration of the pressure maintenance stage exhibited a negative correlation with the blast pressure, ceasing to exist at pressures above 9 MPa. This suggests that the dynamic impact effect gradually supplants the dominant role of the air wedge effect. Quasi-static fracturing formed single fractures, whereas blast fracturing tended to generate complex fracture networks. The increase in blast pressure could significantly enhance the complexity of the fracture network in a logarithmic fashion. The fractal dimension of quasi-static fracturing was slightly higher than that of 6 MPa blast fracturing, indicating the prevalence of quasi-static action under low blast pressure. The smash district increased exponentially as the blast pressure increased, and the average particle size decreased gradually. These investigations provide valuable insights for designing highpressure air blasting fracturing procedures.

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Section: Resultssupporting

confidence: 92%

Comparative Experimental Study of Fracture Mechanisms and Characteristics of Coal-like Materials under Quasi-Static and High-Pressure Air Blasting Fracturing

Wang,

Zhai,

Shao

et al. 2023

Energy Fuels

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“…Aubertin et al 64 coupled the molecular dynamics and extended finite element method to capture the dynamic crack propagation. Li et al 65,66 proposed a series of multiscale continuum-discontinuum models to investigate the fracturing propagation behaviours. Lloberas-Valls et al 67 proposed a domain decomposition technique to capture the strain localization and failure behaviors in a concurrent manner.…”

Section: Hm Coupling Problems In Heterogeneous Pm With Macro-meso Con...mentioning

confidence: 99%

High‐order models for hydro‐mechanical coupling problems in multiscale porous media

Zuo,

Yang,

Cui

et al. 2024

Numerical Meth Engineering

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An accurate prediction of nonlinear hydro‐mechanical (HM) coupling in subsurface structures with pronounced heterogeneity at multiple spatial scales is still an open topic and crucial for numerous engineering applications, for example, hydraulic fracturing and enhanced geothermal systems. In this study, novel high‐order multi‐scale asymptotic solutions are developed to accurately capture the locally oscillating characteristics of gas flow and solid displacement fields at multiple scales. First, the formal macro‐meso two‐scale asymptotic expansion is performed to establish the homogenized solutions and macro‐meso high‐order models which can predict the HM coupling problems at the macroscale and mesoscale. By directly expanding the cell functions defined at the mesoscale to the microscopic levels, the high‐order two‐scale expansion for the mesoscopic cell functions is built, and the upscaled relations for the flow parameters and constitutive coefficients from the microscale to the mesoscale and macroscale are developed correspondingly. The multi‐scale low/high‐order models are established by combining the high‐order expansion of all cell functions at the mesoscale and the developed macro‐meso two‐scale models. The main contributions are that the present approaches follow the reverse thought processes of reiteration homogenization methods, and offer a very innovative and efficient way to establish high‐accuracy high‐order models for the nonlinear HM coupling problems in the heterogeneous porous medium with any number of spatial scales. The effectiveness and accuracy of the present solution are validated by several representative cases with different constitutive coefficient contrasts. The results demonstrate that the high‐order solutions provide an accurate prediction for gas transport and solid deformation of heterogeneous porous media with multi‐scale configurations.

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“…Priors implemented comprehensive investigations on the borehole pressure evolution [19][20][21][22] , explosion energy [22,23] , shock wave [24,25] and fracture propagation [26][27][28][29] of CO2 blasting fracturing experimentally and numerically. Field tests indicate that the quantity of gas extraction from a single borehole controlled by fracturing increased by about 4 times in the initial 8 hours after CO 2 blasting [30] .…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of Supercritical CO2 Shock Fracturing in Hot Dry Rock: The Utilization of CO2 in Geothermal Stimulation

Xiaoguang¹,

Wu²,

Zou³

et al. 2023

Preprint

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Carbon dioxide (CO 2 ) has great utilization potential in the exploitation of deep geothermal resources, especially hot dry rock (HDR). As a clean and renewable resource, HDR geothermal presents a promising prospect in meeting the growing demand for energy and achieving low-carbon solutions. To address the challenges posed in HDR development, such as large water consumption, simple fracture pattern and corresponding fast thermal breakthrough of Enhanced Geothermal System (EGS), a novel non-aqueous stimulation method which combines the advantages of supercritical CO2 (SC) fracturing and dynamic shock effect is proposed and investigated in this paper, i.e. supercritical carbon dioxide shock (SCS) fracturing. To determine its stimulation performance in HDR, we performed controllable lab-scale SCS fracturing experiments on high-temperature granites subjected to true tri-axial stresses. By comparing with conventional water fracturing and SC-CO 2 fracturing, the fracture initiation behavior and stimulation performance of SCS fracturing were investigated quantitatively based on CT scanning and reinjection tests, with respect to fracture morphology and conductivity. Effects of critical parameters were analyzed as well, such as shock pressure, in-situ stress and rock temperature. Results indicate that the breakdown pressure of granite is 24.2~57.5% lower than the shock pressure during SCS fracturing, and it decreases with increasing rock temperature. SCS fracturing could create complex fracture network with more interconnected branches and larger seepage spaces. The volume, area and width of fractures by SCS fracturing are 545.3%, 98.4% and 126.3% higher than those of water fracturing, respectively. The fracture conductivity is 3.4~7.0 times and 4.5~21.2 times higher, as compared to water fracturing and SC fracturing. As the rock temperature increases, both the tortuosity and conductivity of fractures improve dramatically, which benefits to extend the flow path of working medium and enhance the heat transfer performance. In-situ stress plays a relatively weak role in controlling fracture propagation of SCS fracturing. At horizontal stress difference coefficient of 0.14~0.60, the fracture propagation behaves more randomly in direction, contributing to forming complex fractures with multi-branches. Higher shock pressure conduces to the stimulation performance enhancement of SCS fracturing, improving the complexity and connectivity of fracture networks, and promote the fracture to get rid of the control of insitu stress in EGS. The key findings are expected to provide a novel insight into developing HDR geothermal in a more environmentally and more efficient way, and achieving CO 2 utilization and storage.

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Modelling of gas-driven fracturing and fragmentation in liquid CO2 blasting using finite-discrete element method

Cited by 20 publications

References 65 publications

Comparative Experimental Study of Fracture Mechanisms and Characteristics of Coal-like Materials under Quasi-Static and High-Pressure Air Blasting Fracturing

Comparative Experimental Study of Fracture Mechanisms and Characteristics of Coal-like Materials under Quasi-Static and High-Pressure Air Blasting Fracturing

High‐order models for hydro‐mechanical coupling problems in multiscale porous media

Laboratory Study of Supercritical CO2 Shock Fracturing in Hot Dry Rock: The Utilization of CO2 in Geothermal Stimulation

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