Modeling of complex hydraulic fractures in naturally fractured formation

Weng, Xiaowei

doi:10.1016/j.juogr.2014.07.001

Cited by 213 publications

(95 citation statements)

References 105 publications

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“…The hydraulic fracture system doubtless includes fractures running along pre-existing rock joints [31][32][33]. Although the joints are usually filled by calcite, their tensile strength and fracture [18], in actual and logarithmic time scales, when the crack spacing s is changed.…”

Section: Introductionmentioning

confidence: 99%

Growth model for large branched three-dimensional hydraulic crack system in gas or oil shale

Chau

Bažant

2016

Phil. Trans. R. Soc. A.

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Section: Introductionmentioning

confidence: 99%

Growth model for large branched three-dimensional hydraulic crack system in gas or oil shale

Chau

Bažant

2016

Phil. Trans. R. Soc. A.

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“…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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“…Fracturing treatment designs rely heavily on imprecise estimates of the stimulated reservoir volume derived from micro-seismic observations and through a highly inefficient trial-and-error approach [3]. However, the details of fracture networks cannot be measured by these observation methods.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…With the distributions of fracture length, orientation, aperture, etc., and the fracture density, random NF networks can be created [20]. The DFN model has been used by many researchers [3,7,8,20,32]. For example, Riahi and Damjanac [20] investigated the effects of NF connectivity, injection pressure, etc., on the complexity of hydraulic fracture network.…”

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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Modeling of complex hydraulic fractures in naturally fractured formation

Cited by 213 publications

References 105 publications

Growth model for large branched three-dimensional hydraulic crack system in gas or oil shale

Growth model for large branched three-dimensional hydraulic crack system in gas or oil shale

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

Numerical Analysis on the Optimization of Hydraulic Fracture Networks

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