Numerical simulation of hydraulic fracturing of hot dry rock under thermal stress

Guo, Tiankui; Tang, Songjun; Liu, Shun; Liu, Xiaoqiang; Zhang, Wei; Qu, Guanzheng

doi:10.1016/j.engfracmech.2020.107350

Cited by 43 publications

(12 citation statements)

References 35 publications

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Section: Stress Fieldmentioning

confidence: 99%

“…The thermal stress (Item 4 in equation (5)) generated by thermal shock is introduced into the poroelasticity theory. The rock deformation equation can be expressed by equation (5) below (Guo et al., 2020a). where G represents the shear modulus, Pa. u is the displacement component, m. λ represents the lame constant.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Due to the lack of hydraulic fracturing theory considering thermal shock, the THMD model accuracy is verified by comparing it with the experimental result. Based on the experimental research carried out in the literature (Guo et al., 2020a), we constructed a model of 0.1 m × 0.1 m with a wellbore radius of 0.005 m, as shown in Figure 6. Additionally, we select the same parameters and boundary conditions as the literature (Guo et al., 2020a).…”

Section: Model Verificationmentioning

confidence: 99%

“…Based on the experimental research carried out in the literature (Guo et al., 2020a), we constructed a model of 0.1 m × 0.1 m with a wellbore radius of 0.005 m, as shown in Figure 6. Additionally, we select the same parameters and boundary conditions as the literature (Guo et al., 2020a). The comparison between the simulation and experimental results is shown in Figure 7.…”

Section: Model Verificationmentioning

confidence: 99%

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Numerical simulation on hydraulic fracture propagation in laminated shale based on thermo-hydro-mechanical-damage coupling model

Zhang

Guo

et al. 2023

International Journal of Damage Mechanics

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The temperature of a deep shale reservoir may reach more than 100°C, and the effect of thermal shock on shale hydraulic fracturing has rarely not been considered in previous studies. Based on mesoscopic damage mechanics and the finite element method, a thermo-hydro-mechanical-damage (THMD) coupling model considering temperature, seepage, stress, and damage fields was constructed to investigate the effects of reservoir temperature, convective heat transfer coefficient ( h), in-situ stress difference and bedding plane angle ( αθ) on shale hydraulic fracturing. The results show that multiple hydraulic fractures (HFs) can occur under thermal shock and that HFs control the distribution of seepage, temperature, and stress fields. Reservoir temperature, in-situ stress difference and αθ are primary factors affecting hydraulic fracturing, whereas h is a secondary factor. When the reservoir temperature rises from 50°C to 150°C, the initiation and breakdown pressures decrease by 65.5% and 16.7%, respectively. HFs cross the bedding plane more easily, and fracture complexity is obviously enhanced. A higher h is favourable for slightly reducing the initiation and breakdown pressures, but it has little influence on the fracture complexity. Once the in-situ stress difference is low, there is a high fracture complexity, but HFs are more easily captured by bedding planes to limit the propagation of fracture height. When the in-situ stress difference is high, HFs are more likely to form bi-wing fractures. Whether αθ is too large or small, it is not conducive to improving the fracture complexity. In this study, when αθ is 30°, HFs and bedding planes intersect to form a fracture network. Essentially, thermal shock plays a key role in reducing the initiation pressure and forming multiple HFs during the fracturing process, and fracture propagation mainly depends on the injection pressure. The results can serve as reasonable suggestions for the optimization of shale hydraulic fracturing.

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Section: Stress Fieldmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

See 2 more Smart Citations

Numerical simulation on hydraulic fracture propagation in laminated shale based on thermo-hydro-mechanical-damage coupling model

Zhang

Guo

et al. 2023

International Journal of Damage Mechanics

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“…In addition, a number of hybrid approaches have been presented, such as the combined finite-discrete element method [18,19] and hybrid discrete-continuum method [20]. Different from the discontinuous method, the continuous method treats fractures immersed in the finite element by using an auxiliary variable, such as the continuous damaged method [21,22], the phase field method [23][24][25], and the peridynamic method [26][27][28]. These methods possess the advantage of requiring no additional criterion for the determination of fracture propagation behavior, which makes it convenient for complex fracture problems with fracture branching and joining.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Non-Uniform Perforation Parameters for Multi-Cluster Fracturing

2022

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Stress shadowing affects the simultaneous propagation of fractures from multiple perforation clusters. Employing uniform perforation parameters for all clusters cause the unbalanced growth of fractures, which arouses the demand of optimizing non-uniform perforation parameters. An optimization workflow combining a fracture propagation model and the particle swarm optimization method (PSO) is proposed for multi-cluster fracturing in this study. The fracture model considers the coupling of rock deformation and fluid flow along the wellbore and fractures, and it is solved by using the Newton iteration method. The optimization is performed by taking the variance of multiple fracture lengths as fitness value function in the frame of the PSO method. Numerical results show that using the same spacings and perforation parameters for all clusters is detrimental to the balanced growth of multiple fractures. The variance of fracture lengths drops greatly through optimization of cluster spacings and perforation number/diameter. Properly increasing the spacing and perforation number/diameter for the middle clusters promotes the balanced growth of multiple fractures. This study provides an efficient optimization workflow for multi-cluster fracturing treatment in horizontal wells.

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Phase-Field Simulation of Hydraulic Fracturing by CO2 and Water with Consideration of Thermoporoelasticity

Feng

Firoozabadi

2023

Rock Mech Rock Eng

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Numerical simulation of hydraulic fracturing of hot dry rock under thermal stress

Cited by 43 publications

References 35 publications

Numerical simulation on hydraulic fracture propagation in laminated shale based on thermo-hydro-mechanical-damage coupling model

Numerical simulation on hydraulic fracture propagation in laminated shale based on thermo-hydro-mechanical-damage coupling model

Optimization of Non-Uniform Perforation Parameters for Multi-Cluster Fracturing

Phase-Field Simulation of Hydraulic Fracturing by CO2 and Water with Consideration of Thermoporoelasticity

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