Discing behavior and mechanism of cores extracted from Songke-2 well at depths below 4,500 m

Gao, Mingzhong; Hao, Haichun; Xue, Shouning; Lu, Tiecheng; Cui, Pengfei; Gao, Yanan; Xie, Jing; Yang, Bohan; Xie, Heping

doi:10.1016/j.ijrmms.2021.104976

Cited by 58 publications

(6 citation statements)

References 21 publications

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“…It has been applied in the fields of natural gas and oil exploitation [1], geothermal exploitation [2][3][4], coal mining [5,6] and extraction of coalbed methane [7,8], land subsidence [9], induced earthquakes [10,11], disposal of nuclear waste and pollutants [12,13], etc. Nowadays, the profound evolution of the international situation and the turbulent global energy supply and demand pattern have forced mining to go deeper [14][15][16][17][18][19], the research on the seepage law of cracks in rocks and coal seams has become more and more important. According to a large number of statistics, the basic units of underground medium fractures are divided into single fractures and cross fractures.…”

Section: Introductionmentioning

confidence: 99%

Study on seepage characteristics of cross fractures in adjacent and convective flow modes

et al. 2023

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The distribution of fractures in the underground rock mass is complex, so it is of great significance to study the parameter characteristics of fracture seepage for geothermal exploitation, land subsidence, and other fields. Based on the Weierstrass-Mandelbrot function, several X-shaped fracture models with different roughness are established, and the fracture seepage law under different roughness and inlet pressure is studied. At the same time, the center (cross-region) of the X-shaped fracture is selected as the research object, and the seepage difference characteristics of the cross-region under the two inlet modes of adjacent flow and convective flow are compared and analyzed. The results show that the outlet velocity of fracture fluid is inversely proportional to the fractal dimension and is directly proportional to the inlet pressure.

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Section: Introductionmentioning

confidence: 99%

Study on seepage characteristics of cross fractures in adjacent and convective flow modes

et al. 2023

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“…Under engineering disturbance, the instability and failure of the coal body are promoted by the initiation, expansion, interaction, and penetration of defects [1][2][3][4]. The complex fracture structure impacts coal deformation and failure [5][6][7][8]. The nonuniform distribution and expansion evolution of fractures lead to variations in the permeability and mechanical characteristics of the coal body [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on the Fracture Evolution Law of Coal Based on Image Retrieval Method and X-Ray Computed Tomography

Wang

Pang

et al. 2022

Geofluids

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The combination of real-time computed tomography (CT) scanning test and loading test can visualize the evolution process of defects such as internal pores and fissures in the coal. The axial deformation of the loaded coal sample will change the layers of the same section in the real-time CT scanning test, which will affect the analysis of fracture progression. To address the concern, we presented a CT image similarity retrieval method. The dynamic development law of fracture networks under triaxial stress was investigated using image processing technologies. The results reveal that the CT images of the coal sample in the same section can be obtained using the proposed CT image similarity retrieval method, which can more accurately characterize the fracture distribution and dynamic evolution law. The coal sample under triaxial stress experienced three fracture evolution stages: the closure in the compaction and elastic stages, the initiation and development in the plastic yield stage, and the rapid expansion and penetration in the postpeak stage. The variation trend of two-dimensional fracture ratio and fracture volume was consistent. The analysis is conducive to clarifying the coal failure mechanism under triaxial stress.

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“…Continuous exploration and development of deep earth extended resources has become a common phenomenon [1][2][3]. The development and utilization of hot dry rock geothermal resources with huge reserves, clean and unaffected by climate within 3-10 km below the surface, have attracted much attention at present [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Analytical Study of Fluid Flow and Thermal Transfer in a Rough Fracture

2022

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The surface morphology of rough fractures significantly affects the fluid flow and heat transfer characteristics in the fractures. A thermal-flow coupling model with specific geometric fractures was established to investigate the influence of surface morphology on the heat transfer characteristics of a single fracture. The effect of temperature on the physical properties of rocks and fluids was included in the study to reflect the actual situation more realistically. The research results show that the temperature of the fluid in the rough fracture is nonlinearly distributed along the flow direction and the higher the flow velocity, the higher the heat transfer efficiency. The fracture surface morphology has a significant impact on the heat transfer characteristics, and the surface fluctuation will greatly affect the flow velocity, causing the fluid temperature to change abruptly at the fracture surface. Under the same flow rate, with the increase of the fluctuation degree of the fracture surface and the fluctuation frequency, the larger the heat exchange area of the fracture surface, the stronger the heat exchange performance. The heat transfer efficiency of the fracture is directly related to the heat transfer area of the fracture, so even with the same permeability, the heat transfer performance of fractures with different surface topography is different.

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Discing behavior and mechanism of cores extracted from Songke-2 well at depths below 4,500 m

Cited by 58 publications

References 21 publications

Study on seepage characteristics of cross fractures in adjacent and convective flow modes

Study on seepage characteristics of cross fractures in adjacent and convective flow modes

Study on the Fracture Evolution Law of Coal Based on Image Retrieval Method and X-Ray Computed Tomography

Numerical and Analytical Study of Fluid Flow and Thermal Transfer in a Rough Fracture

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