Formation mechanisms of hydraulic fracture network based on fracture interaction

Peng, Zheng; Xia, Yucheng; Yao, Tingwei; Xu, Jiang; Xiao, Peiyao; He, Zexuan; Zhou, Desheng

doi:10.1016/j.energy.2021.123057

Cited by 30 publications

(25 citation statements)

References 38 publications

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“…4.1.3 Boundary element method. Boundary element method (BEM) is developed to transform the boundary and fracture into algebraic equations (Zheng et al, 2022). Some advanced methods based on conventional BEM are established, such as the sub-region boundary element method (SBEM), dual-boundary element method (DBEM), dual-reciprocity boundary element method (DBEM) and scale boundary finite element method (SBFEM) Ooi Kumar and Ghassemi (2016), Crouch and Starfield (1983), Teh et al (2021), Gray et al (1990), Mi and Aliabadi (1992), Cisilino and Aliabadi (1999), Kumar and Ghassemi (2018).…”

Section: Review Of Stress Shadow and Methodsmentioning

confidence: 99%

“…Boundary element method (BEM) is developed to transform the boundary and fracture into algebraic equations (Zheng et al ., 2022). Some advanced methods based on conventional BEM are established, such as the sub-region boundary element method (SBEM), dual-boundary element method (DBEM), dual-reciprocity boundary element method (DBEM) and scale boundary finite element method (SBFEM) Ooi et al.…”

Section: Numerical Analysis Of Continuous Stress Field and Discontinu...mentioning

confidence: 99%

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Stress-dependent unstable dynamic propagation of multiple hydraulic fractures: a review of stress shadow effects and continuum-discontinuum methods

Wang

Liu

2023

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PurposeThe unstable dynamic propagation of multistage hydrofracturing fractures leads to uneven development of the fracture network and research on the mechanism controlling this phenomenon indicates that the stress shadow effects around the fractures are the main mechanism causing this behaviour. Further studies and simulations of the stress shadow effects are necessary to understand the controlling mechanism and evaluate the fracturing effect.Design/methodology/approachIn the process of stress-dependent unstable dynamic propagation of fractures, there are both continuous stress fields and discontinuous fractures; therefore, in order to study the stress-dependent unstable dynamic propagation of multistage fracture networks, a series of continuum-discontinuum numerical methods and models are reviewed, including the well-developed extended finite element method, displacement discontinuity method, boundary element method and finite element-discrete element method.FindingsThe superposition of the surrounding stress field during fracture propagation causes different degrees of stress shadow effects between fractures and the main controlling factors of stress shadow effects are fracture initiation sequence, perforation cluster spacing and well spacing. The perforation cluster spacing varies with the initiation sequence, resulting in different stress shadow effects between fractures; for example, the smaller the perforation cluster spacing and well spacing are, the stronger the stress shadow effects are and the more seriously the fracture propagation inhibition arises. Moreover, as the spacing of perforation clusters and well spacing increases, the stress shadow effects decrease and the fracture propagation follows an almost straight pattern. In addition, the computed results of the dynamic distribution of stress-dependent unstable dynamic propagation of fractures under different stress fields are summarised.Originality/valueA state-of-art review of stress shadow effects and continuum-discontinuum methods for stress-dependent unstable dynamic propagation of multiple hydraulic fractures are well summarized and analysed. This paper can provide a reference for those engaged in the research of unstable dynamic propagation of multiple hydraulic structures and have a comprehensive grasp of the research in this field.

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Section: Review Of Stress Shadow and Methodsmentioning

confidence: 99%

Section: Numerical Analysis Of Continuous Stress Field and Discontinu...mentioning

confidence: 99%

Stress-dependent unstable dynamic propagation of multiple hydraulic fractures: a review of stress shadow effects and continuum-discontinuum methods

Wang

Liu

2023

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“…prepared a model to study hydraulic fracturing in shale reservoirs using the Hybrid Fast Matching Method simulation. The contact of hydraulic fracture with the reservoir discontinuities can be reviewed by ABAQUS 131 . Huang et al 132 .…”

Section: Types Of Hydraulic Fracturing Numerical Simulationmentioning

confidence: 99%

A comprehensive review of numerical simulation methods for hydraulic fracturing

Ismail,

Azadbakht

2024

Num Anal Meth Geomechanics

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Hydraulic fracturing unlocks previously inaccessible hydrocarbons in unconventional reservoirs by creating artificial pathways in the unconventional reservoir. Numerical simulation expands the scope of hydraulic fracturing design for various reservoir conditions. This review paper explores the synergy between numerical simulation and hydraulic fracturing modeling, focusing on critical elements like geomechanical behavior, geological conditions, and fluid dynamics. Analytical models in hydraulic fracturing design are discussed to underscore their foundational importance. The assumption of constant fracture height limits the application of Perkins–Kern–Nordgren model (PKN) and Kristianovich‐Geertsma‐de Klerk model (KGD). Radial models assume 3D flow but lack reliability in nonradial settings, and the Pseudo 3D model (P3D) shares PKN's assumptions with variable fracture height, sacrificing some details for efficiency. Planar 3D model (PL3D) enhances accuracy by discarding PKN's elastic response assumption but requires extended computation. Unconventional fracture model is effective for complex scenarios but relies on DFN modeling parameters for accuracy. The choice of numerical simulation method in hydraulic fracturing depends on the specific aspect studied, each with its strengths and limitations. For instance, boundary element methods are efficient for exterior problems, finite element modeling suits 3D nonplanar fractures, and the extended finite element method excels in hydraulic and natural fracture interactions. Peridynamics shows potential but needs further development for cost‐effectiveness. PFC and UDEC/3DEC‐based simulations can explore microscopic mechanisms. Combining these methods with other approaches provides a comprehensive study of realistic reservoir conditions. This review guides the selection of a suitable numerical simulation methodology based on the study's scope.

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“…and f ′ yyy are the derivatives of function f ðx, yÞ, respectively; ν is the Poisson ratio; and G is the shear modulus, MPa. For a detailed description of rock deformation, refer to our previous studies [36].…”

Section: Fracture Deformation and Flow Of Fracturing Fluid Inmentioning

confidence: 99%

“…These data are applicable to tight sandstone reservoirs, and we have sum-marized the value range of data in previous studies. For details, please refer to Zheng et al [36]. According to formula (14), there is a certain relationship between stress difference and HF angle.…”

Section: The Deflection Of Hydraulicmentioning

confidence: 99%

Factors Controlling the Hydraulic Fracture Trajectory in Unconventional Reservoirs

et al. 2022

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The morphology of hydraulic fracture is affected by many factors. In previous studies, due to the heterogeneity of rock samples and the limitations of sample size, influence degree of various factors on fracture deflection angle has not been well distinguished in laboratory experiments. Based on the boundary element method, we established a mathematical model to study the factors controlling the morphology of hydraulic fracture. Simulation results show that with increasing injection pressure, the radius of the fracture curvature increases. When the difference between the injection pressure and the maximum principal stress is 5 times the ground stress difference, the influence of in situ stress on hydraulic fracture deflection can be ignored. Hydraulic fracture deflection angle was relatively larger when considering the viscosity of the fracturing fluid. When stress difference is too small or the injection pressure is too big, the deflection angle of fracture is easy to fluctuate during initial propagation. Too large Young’s modulus and too small Poisson’s ratio will inhibit the fracture deflection and cause a narrower width of fracture. The effect of Poisson’s ratio on fracture aperture is less than 1 mm. When perforation angle is perpendicular to maximum horizontal principal stress, the fracture width first increases rapidly and then gradually decreases from heel to tip. The influence degree of each factor on fracture deflection is ranked: stress difference of in-situ stress is the biggest, followed by injection pressure and perforation angle. This study is of great significance for the control of hydraulic fracture morphology and the further improvement of fracturing effect.

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Formation mechanisms of hydraulic fracture network based on fracture interaction

Cited by 30 publications

References 38 publications

Stress-dependent unstable dynamic propagation of multiple hydraulic fractures: a review of stress shadow effects and continuum-discontinuum methods

Stress-dependent unstable dynamic propagation of multiple hydraulic fractures: a review of stress shadow effects and continuum-discontinuum methods

A comprehensive review of numerical simulation methods for hydraulic fracturing

Factors Controlling the Hydraulic Fracture Trajectory in Unconventional Reservoirs

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