Spatial and temporal constraints of the cohesive modeling: A unified criterion for fluid‐driven fracture

Wang, Quan; Yu, Hao; Xu, Wenlong; Lyu, ChengSi; Zhang, Jianing; Micheal, Marembo; Wu, HengAn

doi:10.1002/nme.7227

Cited by 8 publications

(5 citation statements)

References 86 publications

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“…During the fracture propagation, the stresses at the fracture tip are singular from the view of LEFM, which stems from the linear elastic continuum representation of materials and the assumption of a well-formed fracture. 42 LEFM is inadequate for eliminating the stress singularity and accurately characterizing the propagation behavior at the fracture tip. The cohesive zone model (CZM), which is proposed by Dugdale and Barenblatt, 43,44 offers a more appropriate description.…”

Section: Model and Methodologymentioning

confidence: 99%

“…In general, the fracture growth at the fracture tip is defined in terms of linear elastic fracture mechanics (LEFM). During the fracture propagation, the stresses at the fracture tip are singular from the view of LEFM, which stems from the linear elastic continuum representation of materials and the assumption of a well-formed fracture . LEFM is inadequate for eliminating the stress singularity and accurately characterizing the propagation behavior at the fracture tip.…”

Section: Model and Methodologymentioning

confidence: 99%

“…66−68 The meshing strategy is based on the principle of maintaining the balance between accuracy and computational expense. 42 Table 1. Input Parameters of the Verification Model Consequently, the global mesh shows a gradual transition along the normal direction of the transverse fracture plane, with its size increasing gradually from 0.2 to 4 m (Figure 4b).…”

Section: Model Validationmentioning

confidence: 99%

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Multiwell Fracturing Characteristic in Layered Heterogeneous Formation and the Optimization of Stimulated Reservoir Volume

Ke,

Wang,

et al. 2024

Energy Fuels

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Hydraulic fracturing within multiwell pads is considered an effective technique for enhancing the recovery of oil/gas resources, but the fracture propagation behaviors have not been fully understood, typically considering the layered heterogeneous construction and intricate stress interference effects. This work establishes a multiwell fracturing model based on the threedimensional displacement and pore pressure coupled cohesive method to precisely characterize the propagation and morphology features of the hydraulic fracture. The flow behavior in the well follows the Bernoulli equation, and the fluid distribution at each perforation point is automatically regulated with the fluid pipe element. The fracturing model is validated with the analytical solution for the penny-shaped fracture. Various fracturing scenarios, including the spatial relations of wells and clusters and the geological conditions are thoroughly revealed. The results demonstrate that the layered formation significantly influences the stress interference between wells and clusters and thus alters the fracture propagation. It can be observed that the intercluster stress interference is weakened when confined within the layered formation, where the fractures grow uniformly along the lateral direction even with a small cluster spacing. When the wells are located at different layers, three typical propagation modes are summarized as lateral propagation, penetration, and aggregation, depending on the in situ stress, rock strength, and fracture energy of different layers in the formation. Meanwhile, optimization of the well pattern is discussed from the perspective of the fracture area to achieve the maximization of the stimulated reservoir volume (SRV). These insights are helpful for the design and implementation of multiwell fracturing technology in tight formation with layered heterogeneous construction.

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Section: Model and Methodologymentioning

confidence: 99%

Section: Model and Methodologymentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

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Multiwell Fracturing Characteristic in Layered Heterogeneous Formation and the Optimization of Stimulated Reservoir Volume

Ke,

Wang,

et al. 2024

Energy Fuels

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“…To tackle the challenge of hydraulic fracturing, methods have been used to describe the fracture propagation range, including finite element method (FEM), , extended finite element method (XFEM), , displacement discontinuity method (DDM), unconventional fracture model, and peridynamics, to mention but a few. To combat the drawbacks of the linear elastic fracture mechanics, Wang et al introduced a fully coupled model for hydraulic fracture propagation by combining XFEM and the cohesive zone method (CZM) to accurately predict the geometry of the fracture alongside the stress due to propagation in brittle and ductile rocks. Whereas this model proved successful in describing the evolution of the fracture, details of the interaction between the fracture and the matrix were not elaborated.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Fracturing and Enhanced Recovery in Shale Reservoirs: Theoretical Analysis to Engineering Applications

et al. 2023

Energy Fuels

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Shale reservoirs are extensively exploited using hydraulic fracturing, which forms multiple cracks that connect with the existing natural fractures to create a continuous path for the gas stored in the kerogen to flow to the production well. Apart from the tedious nature of hydraulic fracturing, the mechanism of the storage and flow of gas is equally complex since multiple phases and scales are involved. An accurate understanding of hydraulic fracturing coupled with a strategy of analyzing the flow and overall recovery of gas is paramount to ensure efficient exploitation. In this work, a comprehensive review of the recent strategies used in analyzing the hydraulic fracturing, storage, flow, and recovery of gas is presented. To begin with, the experimental, analytical, and numerical approaches pertinent to hydraulic fracturing are deeply explored. Additionally, the flow of gas through the newly opened channels is accounted for by using a quadruple-domain approach where the mechanisms of flow in shale reservoirs at the nanoscale, microscale, mesoscale, and macroscale are considered. Furthermore, a strategy to capture the multiple phases, including gas, oil, and water, and recover both carbon dioxide and methane is explored through thermal and enhanced gas recovery approaches. This review provides a baseline for understanding how the hydraulic fracture evolves and propagates to create new channels that contribute to the flow of gas, how the gas flows through the created channels across the many scales of the shale reservoir, and how to improve recovery from shale reservoirs.

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“…21,22 In addition to these mentioned, there are phase field model and cohesive element method, which have been proven effective tools for modeling fracture initiation, propagation, coalescence, and branching in solids. [23][24][25] The FDEM can not only reflect the advantages of high computational efficiency of the finite element method but also study the heterogeneous characteristics of rocks like the DEM. According to the fracture criteria, the joint element is fractured to simulate the initiation and propagation process of the fracture.…”

mentioning

confidence: 99%

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Chang,

Qiu,

et al. 2024

Energy Science & Engineering

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The formation of complex fracture network is a difficult problem in the process of deep rock reservoir reconstruction, and the key to the generation of intricate fracture systems in deep reservoirs is to communicate more pre‐existing fractures through hydraulic fracturing, so as to enhance oil recovery. At present, there are few studies on the interactions of hydraulic fractures with pre‐existing fractures under high stress. Therefore, this research studied the influence of the number of pre‐existing fractures on the characteristics of hydraulic fractures by using advanced hydraulic fracturing instruments, and then analyzed the characteristics of hydraulic fractures under different pre‐existing fracture number based on three‐dimensional topography scanning technology and three‐dimensional square box fractal dimension calculation method. Based on the three‐dimensional finite element discrete element method, further research is carried out. The laboratory test findings indicated that the increase of pre‐existing fractures will make the pump pressure curve more stable during the test, and will significantly improve the roughness of hydraulic fractures. The numerical simulation indicated that as the quantity of pre‐existing fractures grows, the fracture area and width also increase, and in instances of a substantial quantity of pre‐existing fractures, the hydraulic fractures are prone to bifurcation, which contributes to the development of intricate fracture networks. With the increase of natural fracture angle, the fracture width decreased, but the fracture area increased. In this study, the influence of the number of pre‐existing fractures on hydraulic fracturing was studied through laboratory tests and numerical simulations, which provided theoretical reference for engineering practice.

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Spatial and temporal constraints of the cohesive modeling: A unified criterion for fluid‐driven fracture

Cited by 8 publications

References 86 publications

Multiwell Fracturing Characteristic in Layered Heterogeneous Formation and the Optimization of Stimulated Reservoir Volume

Multiwell Fracturing Characteristic in Layered Heterogeneous Formation and the Optimization of Stimulated Reservoir Volume

Hydraulic Fracturing and Enhanced Recovery in Shale Reservoirs: Theoretical Analysis to Engineering Applications

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

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