The alterations of critical pore water pressure and micro-cracking morphology with near-wellbore fractures in hydraulic fracturing of shale reservoirs

Dou, Fakai; Wang, Jingguo; Leung, C.F.; Ma, Zhuang

doi:10.1016/j.engfracmech.2020.107481

Cited by 19 publications

(10 citation statements)

References 40 publications

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“…Before the occurrence of micro-cracks, the calculation of the normal force F̅ n sj and shear force F̅ s sj in SJM is similar to the PBM, which follows the force–displacement relationship in Hooke’s law. Once the bonding of SJM is broken, the normal force in SJM with the dilatancy effect is updated as followed. , …”

Section: Brazilian Disc Splitting Modelmentioning

confidence: 82%

“…The complexity of fracture morphology is mainly decided by the matrix cracks. 34 Based on the simulation results under different clay contents, clay modulus, and clay distributions, this part mainly discusses which sensitive factors play a much more key role in the complexity of fracture morphology under the same loading conditions. Taking the models of clay contents as an example, Figure 19 shows the final fracture morphology under different clay contents.…”

Section: Discussionmentioning

confidence: 99%

“…The simulation results of shale fracture morphology under different sensitive factors are further analyzed from the aspect of fractal dimension. The complexity of fracture morphology is mainly decided by the matrix cracks . Based on the simulation results under different clay contents, clay modulus, and clay distributions, this part mainly discusses which sensitive factors play a much more key role in the complexity of fracture morphology under the same loading conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Once the bonding of SJM is broken, the normal force in SJM with the dilatancy effect is updated as followed. 33 , 34 …”

Section: Brazilian Disc Splitting Modelmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Clay Minerals on Tensile Failure Characteristics of Shale

et al. 2022

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Section: Brazilian Disc Splitting Modelmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Once the bonding of SJM is broken, the normal force in SJM with the dilatancy effect is updated as followed. 33 , 34 …”

Section: Brazilian Disc Splitting Modelmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Clay Minerals on Tensile Failure Characteristics of Shale

et al. 2022

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“…It is worth that the permeability evolution rules during the deformation and failure of rock specimens have been investigated in the geotechnical engineering including drilling for oil and gas [16,17] , stability analysis and micro-crack propagation of materials [18,19] , and seepage ows in porous media [19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

In-situ X-ray tomography on permeability evolution of C/SiC porous ceramic for hypersonic vehicles

Zhang

Huang

et al. 2021

Ceramics International

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Transpiration cooling system in hypersonic vehicles still remains a challenge due to the limitations of observing permeability and microstructure evolution of porous medium lled with coolant. To tackle this problem, a novel compression-permeation device is designed with high-resolution X-ray tomography system, and then an investigation on permeability evolution mechanism of a C/SiC porous ceramic under pressure is performed using in-situ X-ray imaging and the compression-permeation device. The experimental results indicate that the pore-space uid ow is displayed in terms of three-dimensional streamlines, making the permeability mechanism clear. Meanwhile the porosity along the thickness of ceramic under pressure has been obtained by synchrotron tomography testing, and it is also veri ed that the porosity of C/SiC ceramic fabricated in our research group is basically uniform (>95.4%) along the thickness. Furthermore, we have found the evolution rule for permeability of porous ceramic with water, which depends on the variation of its microstructure under different loads.

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Study on rock mechanics characteristics of deep shale in Luzhou block and the influence on reservoir fracturing

Han

Liu

et al. 2022

Energy Science & Engineering

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This paper aims to study the influence of deep formation conditions on the mechanical properties of shale, which is of great significance for the engineering application of efficient development of deep shale gas. In this study, a real-time high-temperature (25°C-170°C) triaxial compression experiment was first carried out on shale samples. Then, based on the analysis results of rock mineral components and discrete element numerical simulation technology, a thermo-mechanical coupling model (TMCM) was constructed, and the accuracy of the numerical model was verified. Finally, based on the micromechanical parameters, a numerical fracturing mechanism model considering the influence of temperature, natural fracture density, and fracture length was established, and the influence of current reservoir conditions on hydraulic fracturing was discussed. The results show that confining pressure has a greater effect on rock mechanics than temperature.When the temperature exceeds 110°C, the plasticity of rock samples increases, and the fracture morphology becomes complex. In addition, the increase in temperature promotes the fracture of microcracks to a certain extent. The research results are expected to provide a sufficient theoretical basis for the development and utilization of deep shale gas resources. K E Y W O R D Sdeep shale gas, PFC, rock mechanics, temperature, XRD | INTRODUCTIONShale gas, an unconventional energy source with abundant reserves, is a clean and environmentally friendly natural gas that has become an important strategic resource in China. 1,2 Deep shale gas in China has a great potential for exploitation. 3 However, a series of technological difficulties exist. 4 In particular, the high-temperature (HT) and high-pressure (HP) geological environment of deep reservoirs results in the transformation of rock mechanical properties, 5 which has a significant impact on geological evaluation, drilling technology, and fracturing. [6][7][8][9] Therefore, this requires considerable attention.In recent decades, several studies have focused on understanding the mechanical behavior of progressive damage and microscopic damage mechanisms of rocks

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The alterations of critical pore water pressure and micro-cracking morphology with near-wellbore fractures in hydraulic fracturing of shale reservoirs

Cited by 19 publications

References 40 publications

Effect of Clay Minerals on Tensile Failure Characteristics of Shale

Effect of Clay Minerals on Tensile Failure Characteristics of Shale

In-situ X-ray tomography on permeability evolution of C/SiC porous ceramic for hypersonic vehicles

Study on rock mechanics characteristics of deep shale in Luzhou block and the influence on reservoir fracturing

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