Numerical Analysis on the Stability of Hydraulic  Fracture Propagation

Zhang, Zhaobin; Li, Xiao; He, Jianming; Wu, You; Zhang, Bo

doi:10.3390/en8099860

Cited by 20 publications

(26 citation statements)

References 45 publications

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“…Here refers to the fluid pressure above which hydraulic fracture begins to propagate. As discussed by Zhang et al [30], is proportional to √ ⁄ , where s is the fracture spacing, then we define:…”

Section: Quantification Of Stress Anisotropy and Fluid Viscositymentioning

confidence: 99%

“…Normalized by rock strength, a dimensionless number M is proposed to quantify the viscous effect of fluid by Zhang et al [30]:…”

Section: Quantification Of Stress Anisotropy and Fluid Viscositymentioning

confidence: 99%

“…McClure and Horne [29] simulated the propagation of complex fracture network and showed that fractures may propagate through a mixture of the opening and sliding of preexisting fractures and the propagation of new fractures. Zhang et al [30] investigated the stability of hydraulic fracture network propagation and found that the localization instability can be suppressed by fluid viscosity. To sum up, the DDM-based models are appropriate for the simulation of complex fracture networks and have been used by more and more researchers [3,7,8,[28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis on the Optimization of Hydraulic Fracture Networks

et al. 2015

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Abstract:The clear understanding of hydraulic fracture network complexity and the optimization of fracture network configuration are important to the hydraulic fracturing treatment of shale gas reservoirs. For the prediction of hydraulic fracture network configuration, one of the problems is the accurate representation of natural fractures. In this work, a real natural fracture network is reconstructed from shale samples. Moreover, a virtual fracture system is proposed to simulate the large number of small fractures that are difficult to identify. A numerical model based on the displacement discontinuity method is developed to simulate the fluid-rock coupling system. A dimensionless stress difference that is normalized by rock strength is proposed to quantify the anisotropy of crustal stress. The hydraulic fracturing processes under different stress conditions are simulated. The most complex fracture configurations are obtained when the maximum principle stress direction is perpendicular to the principle natural fracture direction. In contrast, the worst results are obtained when these two directions are parallel to each other. Moreover, the side effects of the unfavorable geological conditions caused by crustal stress anisotropy can be partly suppressed by increasing the viscous effect of the fluid.

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Section: Quantification Of Stress Anisotropy and Fluid Viscositymentioning

confidence: 99%

“…Normalized by rock strength, a dimensionless number M is proposed to quantify the viscous effect of fluid by Zhang et al [30]:…”

Section: Quantification Of Stress Anisotropy and Fluid Viscositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis on the Optimization of Hydraulic Fracture Networks

et al. 2015

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“…The hydraulic fracture and branch fractures could be generated during Hydraulic fracturing, as shown in Figure 1 [2]. The hydraulic fracture can provide a high-conductivity path for methane migration in the low permeability reservoir.…”

Section: Introductionmentioning

confidence: 99%

“…The hydraulic fracture can provide a high-conductivity path for methane migration in the low permeability reservoir. In recent years, to investigate propagation and re-orientation of hydraulic fracture, lots of research has been conducted [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Propagation of Hydraulic and Natural Fracture Using Dijkstra’s Algorithm

Xiao

2016

Energies

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Utilization of hydraulic-fracturing technology is dramatically increasing in exploitation of natural gas extraction. However the prediction of the configuration of propagated hydraulic fracture is extremely challenging. This paper presents a numerical method of obtaining the configuration of the propagated hydraulic fracture into discrete natural fracture network system. The method is developed on the basis of weighted fracture which is derived in combination of Dijkstra's algorithm energy theory and vector method. Numerical results along with experimental data demonstrated that proposed method is capable of predicting the propagated hydraulic fracture configuration reasonably with high computation efficiency. Sensitivity analysis reveals a number of interesting observation results: the shortest path weight value decreases with increasing of fracture density and length, and increases with increasing of the angle between fractures to the maximum principal stress direction. Our method is helpful for evaluating the complexity of the discrete fracture network, to obtain the extension direction of the fracture.

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Ultrasonic‐assisted synthesis and enhancement of chitosan/graphene nanosheet composites

Huang

2017

Polymer Composites

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This study investigated a simple and low‐cost method for synthesizing graphene nanosheet/chitosan (GNS/CS) composites. The method involved (1) exfoliating graphite to prepare graphite intercalation compounds (GICs) using environment‐friendly ultrasonic energy and intercalating techniques, (2) preparing a high‐concentration GNS/CS dispersion from a mixture of GICs and CS, and (3) producing GNS/CS composites with varying GNS levels by adding the GNS/CS dispersion to CS. By incorporating 0.6 wt% GNS into a CS matrix, the mechanical and electrochemical properties of the resultant GNS/CS composite were markedly improved. Maximum enhancements of 29% and 39% in the elastic modulus and hardness of CS, respectively, were obtained. Furthermore, GNS/CS redox peak currents increased sevenfold relative to a CS‐modified electrode. POLYM. COMPOS., 39:4217–4223, 2018. © 2017 Society of Plastics Engineers

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Numerical Analysis on the Stability of Hydraulic Fracture Propagation

Cited by 20 publications

References 45 publications

Numerical Analysis on the Optimization of Hydraulic Fracture Networks

Numerical Analysis on the Optimization of Hydraulic Fracture Networks

Numerical Simulation of the Propagation of Hydraulic and Natural Fracture Using Dijkstra’s Algorithm

Ultrasonic‐assisted synthesis and enhancement of chitosan/graphene nanosheet composites

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