Crack Initiation Behaviors of Granite Specimens Containing Crossing‐Double‐Flaws with Different Lengths under Uniaxial Loading

Pan, Haiyang; Yin, Dawei; Ning, Jianguo; Xia, Zhiguo

doi:10.1155/2020/8871335

Cited by 36 publications

(27 citation statements)

References 33 publications

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“…The isotherm curves for N 2 adsorption and desorption were obtained, and all the samples were belong to types III and IV according to IUPAC (Figure 3) [46]. The capillary hysteresis loops were distinct and similar to those of H3 types, suggesting that slit-shaped pores were the main pore types in C7 shale, corresponding to the SEM images [47][48][49].…”

Section: Geochemistry Parametersmentioning

confidence: 84%

Characterization of Shale Pore Structure by Multitechnique Combination and Multifractal Analysis and Its Significance

et al. 2020

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Understanding pore structure would enable us to obtain a deeper insight into the fluid mechanism in porous media. In this research, multifractal analysis by various experiments is employed to analyze the pore structure and heterogeneity characterization in the source rock in Ordos Basin, China. For this purpose, imaging apparatus, intrusion tests, and nonintrusion methods have been used. The results show that the objective shale reservoir contains complex pore network, and minor pores dominant the pore system. Both intrusion and nonintrusion methods detected pore size distributions show multifractal nature, while the former one demonstrates more heterogeneous features. The pore size distributions acquired by low temperature adsorption and nuclear magnetic resonance have relatively good consistence, indicating that similar pore network detection method may share the same mechanism, and the full-ranged pore size distributions need to be acquired by multitechniques. Chlorite has an obvious impact on the heterogeneity of pore structure in narrow pore size range, while illite and I/S mixed layer influence that in wide range. Kerogen index is the fundamental indicators of geochemical parameters. With the decrease of averaged small and middle/large pore radius, the heterogeneity of pore structures increase in narrow and wide ranges, respectively. This work employed a comprehensive methodology based on multitechniques and helps to explore how pore networks affect reservoir quality in shale reservoirs.

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Section: Geochemistry Parametersmentioning

confidence: 84%

Characterization of Shale Pore Structure by Multitechnique Combination and Multifractal Analysis and Its Significance

et al. 2020

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“…To ensure that the results of this experiment are comparable with the methods of literature [12] and literature [13], comparative experiments are performed, and the experimental data of the filtration performance of the granular sieves were obtained as comparative experimental data to test the effect of reinjection of geothermal tail water in moderately deep sandstone.…”

Section: Testing Indexmentioning

confidence: 99%

“…At present, research on the testing of reinjection of geothermal tail water has generally developed outside of China and has mainly focused on the well location layout, well network optimization, well spacing, reinjection temperature, reinjection process, and reinjection mode. Based on a large amount of heat flow data, the geothermal resources of dry hot rocks in mainland China are evaluated [13][14][15][16]. Large-scale karst heat storage is utilized to develop modular heating and geothermal energy storage technology, forming a new "Geothermal+" clean energy utilization pattern that considers geothermal energy as well as other forms of energy [17].…”

Section: Introductionmentioning

confidence: 99%

Study on Optimization of Geothermal Tail Water Reinjection Process in Moderately Deep Sandstone

Wang

Liu

et al. 2021

Geofluids

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The existing test methods of geothermal tail water reinjection effect in sandstone geothermal reservoirs are not suitable for moderately deep and deep sandstone geothermal reservoirs, resulting in the poor filtration performance of fine-grained reservoirs. Therefore, a test method for the geothermal tail water reinjection effect in a moderately deep sandstone geothermal reservoir is proposed. This paper studies the static compatibility of raw water and geothermal tail water under different mixing ratios, determines the indexes affecting the reinjection effect of moderately deep sandstone geothermal reservoir tail water, analyzes the weight set of each influencing factor, and formulates a test standard for the reinjection effect of geothermal reservoir tail water. Finally, a tracer is selected to trace the reinjected tail water in the geothermal reservoir, and the tracer is used to obtain the result of each previously determined index. Eventually, the final reinjection effect of the geothermal tail water is obtained. The experimental results show that the fine-grade filtration performance, silt-grade filtration performance, and coarse-grade filtration performance of this method are improved compared with those of other methods; thus, the particle filtration performance is better, and the reinjection effect of geothermal reservoir tail water is better, which has a great significance for the geothermal resource exploitation of moderately deep sandstone.

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“…According to the definition of the overlying strata and its deformation and rupture characteristics, there were three strata in the strata overlying the coal seam, i.e., subkey strata I, subkey strata II, and the primary key strata, all of which have a large thickness, a large elasticity modulus, and a high strength. Due to the significant influence of the rupture of the key strata on the stope, it often occurs with periodic weighting [29][30][31]. It can be reasonably presumed that the surface well was also seriously affected by the rupture of the key strata, which was investigated using the three-dimensional physical similarity simulation.…”

Section: Simulation Test Schemementioning

confidence: 99%

Three‐Dimensional Physical Similarity Simulation of the Deformation and Failure of a Gas Extraction Surface Well in a Mining Area

Sun

Wen

et al. 2020

Advances in Civil Engineering

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Surface well deformation and failure in a mining area are a key issue challenging the surface well gas extraction technique. To provide information for the design of gas extraction surface wells in mining areas, the deformation and failure of surface wells with different materials under the influence of mining-induced rock movement were analyzed based on a three-dimensional physical similarity simulation and key strata theory. The research findings reveal that the fractures in the overlying strata had an elliptic-parabolic shape. The stope center was the highest point in the fracture zone. Horizontal shear deformation was most likely to occur in the thick strata (horizontal shear deformation could be larger if they were key strata) with large strength and stiffness near the intersection between the fracture surface of the overlying strata and the surface well. Due to the shear force and bending moment of the key strata, the surface well deformed into an S-shape. In addition, the surface well was vulnerable to shear deformation in the key strata. The surface well deformation did not weaken from bottom to top due to rock movement. Instead, it was subject to the influence of the rupture strength of the key strata. The surface well above the key strata was prone to tensile strain-compressive strain transition. In contrast, an abrupt change in the compressive strain occurred in the surface well below the key strata where tensile failure may occur. Moreover, a mechanical model of the surface well during the movement of the key strata was established according to the characteristics of the surface well deformation. The test results provide important information on the design optimization of surface wells and high-risk area protection in mining areas.

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Crack Initiation Behaviors of Granite Specimens Containing Crossing‐Double‐Flaws with Different Lengths under Uniaxial Loading

Cited by 36 publications

References 33 publications

Characterization of Shale Pore Structure by Multitechnique Combination and Multifractal Analysis and Its Significance

Characterization of Shale Pore Structure by Multitechnique Combination and Multifractal Analysis and Its Significance

Study on Optimization of Geothermal Tail Water Reinjection Process in Moderately Deep Sandstone

Three‐Dimensional Physical Similarity Simulation of the Deformation and Failure of a Gas Extraction Surface Well in a Mining Area

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