Combined finite-discrete element modelling of hydraulic fracturing in reservoirs with filled joints

Mansour, Soukaina; Aliabadian, Zeinab; Sato, Akira; Shen, Luming

doi:10.1016/j.geoen.2023.212025

Cited by 6 publications

(2 citation statements)

References 77 publications

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“…In fact, the FDEM method can be implemented through globally embedded cohesive elements and can also be used for multi-cluster fracturing simulation research in deep heterogeneous reservoirs. However, when using globally embedded cohesive elements to describe the fractured interface of a reservoir, simulation calculations are very slow (Sharafisafa et al, 2023). Therefore, when the model size is large, the number of grids is large, and there are many grid nodes, the method of locally embedded cohesive elements (Wang et al, 2023) for numerical simulation research can quickly obtain largescale fracturing simulation results.…”

Section: Introductionmentioning

confidence: 99%

Study on multi-cluster fracturing simulation of deep reservoir based on cohesive element modeling

Wu,

Guo

et al. 2024

Front. Energy Res.

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With the depletion of conventional reservoir development, reservoir fracturing under deep high geo-stress and high geo-stress difference conditions is receiving increasing attention. Deep reservoirs typically require multi-cluster fracturing to achieve efficient reservoir transformation and development. In this paper, considering the relevant geological parameters of a certain reservoir in the southwest, three-dimensional multi-cluster reservoir fracturing models were established based on cohesive element modeling. Then, the propagation law of artificial fractures in reservoirs under the influence of the different number of fracturing clusters, injection displacement, and Young’s modulus in different regions of the 60 m fracturing well section is analyzed, and the quantitative law of parameters such as fracture length, maximum fracture width, injection point fracture width, fracture area, and tensile failure ratio during multi-cluster fracturing construction, as well as the propagation law of fracture morphology are revealed. The simulation results show that using multi-cluster fracturing can significantly improve the effectiveness of reservoir reconstruction, but as the number of fracturing clusters increases, it is also easy to form some small opening artificial fractures. These small opening artificial fractures may not be conducive to the transportation of proppants and fluids. During single cluster fracturing, the interface stiffness and rock Young’s modulus have a significant impact on the propagation of artificial fractures in the reservoir. As the number of fracturing clusters increases, the competition between artificial main fractures expands significantly, which may reduce the impact of interface stiffness and rock Young’s modulus. The fluid injection rate has a significant impact on reservoir fracturing, and in the same area, using high displacement injection can significantly increase the volume of reservoir reconstruction. This study can provide some reference for multi-cluster fracturing construction in deep reservoirs.

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Section: Introductionmentioning

confidence: 99%

Study on multi-cluster fracturing simulation of deep reservoir based on cohesive element modeling

Wu,

Guo

et al. 2024

Front. Energy Res.

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“…Various continuum-based and discontinuum-based numerical methods were developed to analyze the crack propagation path when the pre-existing fracture exists in the rock. These methods include the extended finite element method [18][19][20][21], the phase field method [22,23], the discrete element method [24][25][26][27], the 3D lattice method [28][29][30][31], peridynamics [32,33] and the hybrid finite-discrete element method [34,35]. Using these methods, researchers have discussed the influence of stress regime, fracturing fluid viscosity, bedding dip, and the approach angle of the hydraulic fracture to the pre-existing discontinuity.…”

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confidence: 99%

Influence of High-Density Bedding Plane Characteristics on Hydraulic Fracture Propagation in Shale Oil Reservoir

Yan,

Wang,

2024

CMES

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The existence of high-density bedding planes is a typical characteristic of shale oil reservoirs. Understanding the behavior of hydraulic fracturing in high-density laminated rocks is significant for promoting shale oil production. In this study, a hydraulic fracturing model considering tensile failure and frictional slip of the bedding planes is established within the framework of the unified pipe-interface element method (UP-IEM). The model developed for simulating the interaction between the hydraulic fracture and the bedding plane is validated by comparison with experimental results. The hydraulic fracturing patterns in sealed and unsealed bedding planes are compared. Additionally, the effects of differential stress, bedding plane permeability, spacing, and the friction coefficient of the bedding plane are investigated. The results showed that a single main fracture crossing the bedding planes is more likely to form in sealed bedding planes under high differential stress. The decrease in bedding plane permeability and the increase in the friction coefficient also promote the fracture propagating perpendicular to the bedding planes. Shale with high-density bedding planes has a poorer fracturing effect than that with low-density bedding planes, as the hydraulic fracture is prone to initiate and propagate along the bedding planes. Moreover, higher injection pressure is needed to maintain fracture propagation along the bedding. An increase in bedding density will lead to a smaller fracturing area. Fracturing fluid seepage into the bedding planes slows shale fracturing. It is recommended that increasing the injection flow rate, selecting alternative fracturing fluids, and employing multiwell/multi-cluster fracturing may be efficient methods to improve energy production in shale oil reservoirs. KEYWORDSHydraulic fracturing; bedding planes; shale; unified pipe-interface element method Nomenclature σEffective stress tensor α Biot coefficient p Fluid pressure

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Experimental and numerical investigation on crack propagation for a zigzag central cracked Brazilian disk

Sarfarazi,

Fu,

Haeri

et al. 2024

Comp. Part. Mech.

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Combined finite-discrete element modelling of hydraulic fracturing in reservoirs with filled joints

Cited by 6 publications

References 77 publications

Study on multi-cluster fracturing simulation of deep reservoir based on cohesive element modeling

Study on multi-cluster fracturing simulation of deep reservoir based on cohesive element modeling

Influence of High-Density Bedding Plane Characteristics on Hydraulic Fracture Propagation in Shale Oil Reservoir

Experimental and numerical investigation on crack propagation for a zigzag central cracked Brazilian disk

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