3D Multi-scale Reconstruction of Fractured Shale and Influence of Fracture Morphology on Shale Gas Flow

Hou, Peng; Liang, Xin; Zhang, Yun; He, Jian; Gao, Feng; Jia, Lina

doi:10.1007/s11053-021-09861-1

Cited by 70 publications

(28 citation statements)

References 44 publications

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“…CT is nondestructive detection technology and extensively used in the research of mesodamage mechanical properties and internal component analysis of porous material, such as coal and shale. It could realize continuous and multiple scanning records of different sections of the sample and also realize 3D reconstruction and display the three-dimensional structure of the sample [41][42][43][44][45]. The principle of CT is that Xrays passing through substances with different densities would be attenuated to varying degrees and show different colors (gray value) on the images.…”

Section: Results and Analysismentioning

confidence: 99%

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Guo

Liu

et al. 2021

Geofluids

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Both computed tomography (CT) and notched semicircular bend (NSCB) tests are performed for coals with high and medium bursting proneness to extract the scientific expression of pore-fracture and its influence mechanism on the tensile failure behavior. The acoustic emission (AE) parameters in the sample during loading and failure are monitored, and the influence mechanism of pore-fracture on tensile failure behavior of coal is analyzed. The result illustrates that the spatial distribution feature of the pore-fracture in coals with high and medium bursting proneness is extremely different. The deformation and failure mode of the coals are affected by many factors, loading mode, notch depth and width, mechanical properties of matrix and minal, spatial distribution feature of pore-fracture, etc. The influence of primary pore-fracture in the coal on the extension and penetration of the secondary fracture could be divided into two types: bifurcation and promotion, which would cause different local damage in the sample and affect the final failure mode. The feature of acoustic emission parameters indicates that the deformation and failure process of a sample under loading could be divided into four stages: compaction stage, elastic deformation stage, displacement plastic growth stage, and post peak failure stage, which is the result of comprehensive action of many factors. The evolution process of secondary fracture is accompanied by the dissipation of elastic strain energy and the intensification of internal damage of coal, which reflects the failure process of coal.

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Section: Results and Analysismentioning

confidence: 99%

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Guo

Liu

et al. 2021

Geofluids

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“…Study. The primary condition of the crack volume strain should meet the small deformation con-dition stipulated in "Elastic Mechanics," which represents the volume strain generated by plastic deformation and fracture [41][42][43]. The detailed derivation process is as follows.…”

Section: Volumetric Strainmentioning

confidence: 99%

Study on Mechanical Behavior and Seepage Characteristics of Coal Mass during Unloading

2021

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With the increase of buried depth, the content of gas increases gradually. The gas in the mining process will lead to gas gush and other dynamic disasters, or even coal and gas gushing in front of the working face. Therefore, the study on the permeability distribution of coal and the surrounding rock is the core work of coal and gas mining at the same time. To study the mechanical behaviors and seepage characteristics of coal mass during unloading is to prepare for coal and gas mining in the future, which can not only ensure the safety of operators to the maximum extent but also increase the mining rate as much as possible. Based on the stress-strain curve and seepage curve, the brittleness index and seepage characteristics of coal are analyzed. The greater the brittleness index is, the more likely the coal mass is to produce cracks, and then to form large cracks, or even fracture. Through the study of brittleness index and seepage characteristics of coal mass, the mechanical behavior of coal mass can be easily obtained, so as to guide the mining of coal mass.

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“…Coal pores determine the mechanical properties of coal and affect the seepage and drainage of coalbed methane. The pore fracture structure affects the gas flow behaviour, and the well-connected pore fracture network can effectively promote the gas flow [20,21]. Most coal body damage is investigated under various load types, such as static and dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

Research Progress of Coal Damage under Unsteady Load in China

Chen

Fan

et al. 2021

Geofluids

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Coalbed methane mining, suppression of coal dust, and elimination of dynamic disasters are closely related to the expansion of coal body cracks and internal damage. Understanding the expansion mechanism of pore-cracks is critical to investigate coal body damage. In this study, research from 2016 to 2021 conducted on the coal damage mechanism in China was sorted and the progress in this field was analysed to systematically investigate coal body damage. Critical topics of research in this field in recent years were identified, and load types were classified into static and dynamic loads. Dynamic loads with obvious characteristics and considerable damage-increasing effects were classified into impacting, cyclic, pulsating, and other dynamic load types. The current load-generating devices, various detection techniques and methods, research results, and the future research directions under various load types were discussed. The current coal damage research is primarily based on macrocharacteristic analysis and the stage characteristics of characterisation variables. The use of scanning electron microscopy, computerised tomography three-dimensional reconstruction technology, and acoustic emission technology can reveal the pore propagation mechanism at the micro level.

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3D Multi-scale Reconstruction of Fractured Shale and Influence of Fracture Morphology on Shale Gas Flow

Cited by 70 publications

References 44 publications

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Investigation on Pore-Fracture of Coal and Its Influence Mechanism on Tensile Failure Behavior of Coals with Bursting Proneness

Study on Mechanical Behavior and Seepage Characteristics of Coal Mass during Unloading

Research Progress of Coal Damage under Unsteady Load in China

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