Numerical Simulation on Deflecting Hydraulic Fracture with Refracturing Using Extended Finite Element Method

Li, Jianxiong; Dong, Shiyun; Hua, Wen; Yang, Yang; Li, Xiaolong

doi:10.3390/en12112044

Cited by 17 publications

(8 citation statements)

References 48 publications

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“…Sepehri et al [11][12][13] studied the effect of interference between clusters on fracture pattern by considering fluid loss and fluid distribution among clusters and optimized the cluster spacing in multi fracture expansion. Li et al [14,15] found that the less stress difference causes greater fracture deflection when considering the effect of stress difference on fracture expansion. Li et al [16][17][18] studied the fracture pattern in synchronous fracturing and alternate fracturing by considering the fracturing fluid properties and engineering parameters, and concluded that stress interference is significant in synchronous fracturing.…”

Section: Nomenclature Umentioning

confidence: 99%

Factors Influencing Fracture Propagation in Collaborative Fracturing of Multiple Horizontal Wells

Gong,

Chen,

Cheng

et al. 2024

ENERGY

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Horizontal well-stimulation is the key to unconventional resource exploration and development. The development mode of the well plant helps increase the stimulated reservoir volume. Nevertheless, fracture interference between wells reduces the fracturing effect. Here, a 2D hydro-mechanical coupling model describing hydraulic fracture (HF) propagation is established with the extended finite element method, and the effects of several factors on HF propagation during multiple wells fracturing are analyzed. The results show that with an increase in elastic modulus, horizontal principal stress difference and injection fluid displacement, the total fracture area and the reservoir stimulation efficiency are both improved in all three fracturing technologies. After a comparison of the three technologies, the method of improved zipper fracturing is proposed, which avoids mutual interference between HFs, and the reservoir stimulation effect is improved significantly. The study provides guidance for optimizing the fracturing technology of multiple horizontal wells.

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Section: Nomenclature Umentioning

confidence: 99%

Factors Influencing Fracture Propagation in Collaborative Fracturing of Multiple Horizontal Wells

Gong,

Chen,

Cheng

et al. 2024

ENERGY

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“…The XFEM can be also used to simulate the deflecting hydraulic fracture with refracturing, and it is concluded that the horizontal stress has obvious influence on re-orientation behavior. 24 However, this method can simulate the mechanical behavior of a single crack well, but it is difficulty to describe multi-cracks problems. 25,26 Thus, a meshless numerical method is required to overcome the deficiencies of the mesh-based method in simulating crack propagation and large deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al 23 investigated the hydraulic‐driven crack propagation behavior through employing a cohesive pore pressure element, and the effect of geologic and fracturing parameters on hydraulic‐driven crack propagation in the layered reservoir was analyzed. The XFEM can be also used to simulate the deflecting hydraulic fracture with refracturing, and it is concluded that the horizontal stress has obvious influence on re‐orientation behavior 24 . However, this method can simulate the mechanical behavior of a single crack well, but it is difficulty to describe multi‐cracks problems 25,26 .…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical coupling model for mechanical and hydraulic behavior of fractured rock mass in the framework of advanced general particle dynamics

Zhou

Fan

et al. 2022

Fatigue Fract Eng Mat Struct

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In this paper, hydromechanical coupling model is proposed to study the mechanical and hydraulic behavior of fractured rock mass in the framework of advanced general particle dynamics (GPD), and the relationship between stress and seepage is determined. Then, the proposed model is employed to investigate one-dimensional seepage, and the numerical seepage field is in a good agreement with the analytical solution, implying the feasibility and accuracy of advanced GPD method. Finally, the proposed model is applied to analyze the mechanical and hydraulic behavior of surrounding rock mass around excavated tunnel under hydromechanical coupling conditions, and the numerical results obtained by the proposed model are in a good agreement with those obtained by PFC, which further verifies the correctness of the proposed model. K E Y W O R D S advanced general particle dynamics, fractured rock mass, hydromechanical coupling model, mechanical and hydraulic behavior

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“…To date, investigations of the HF deflecting propagation rules focus on the effects of horizontal in situ stresses differences, fracture initiation azimuth, and disturbance stress on HF deflecting trajectory [3][4][5][6]. However, researches on injection rate-dependent (IRD) HF deflecting propagation are relatively limited [7,8]. The limited studies, conducted by true triaxial physical simulation tests of hydraulic fracturing [8] and extended finite element (XFEM) simulations [7], reveal that the increased injection rates remarkably extend the HF deflecting distance.…”

Section: Introductionmentioning

confidence: 99%

“…However, researches on injection rate-dependent (IRD) HF deflecting propagation are relatively limited [7,8]. The limited studies, conducted by true triaxial physical simulation tests of hydraulic fracturing [8] and extended finite element (XFEM) simulations [7], reveal that the increased injection rates remarkably extend the HF deflecting distance. The above investigation provides references for the effective control of HF deflecting propagation.…”

Section: Introductionmentioning

confidence: 99%

Injection Rate-Dependent Deflecting Propagation Rule of Hydraulic Fracture: Insights from the Rate-Dependent Fracture Process Zone of Mixed-Mode (I-II) Fracturing

Xing

Huang

2021

Geofluids

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Mixed-mode (I-II) fracturing is a prominent mechanical characteristic of hydraulic fracture (HF) deflecting propagation. At present, understanding the effect of injection rates on HF deflecting propagation remains challenging and restricts the control of HF deflecting propagation bearing tensile and shear stresses with fluid injection rates. Our recently published experimental results show that the fracture process zone (FPZ) length of mixed-mode (I-II) fractures in rock-like materials increases with the rising quasistatic loading rate. Both the deformation in FPZ and the generation of real fracture surfaces are tensile. On this basis, the rate-dependent mixed-mode (I-II) cohesive fracture model was proposed under quasistatic loading, and a couple of theoretical outcomes were obtained. Under different injection rates, the deflecting HF propagates step-by-step under mixed-mode (I-II) fracturing, and the HF extension path is supposed to be straight in each step. With the increment of injection rate, the increased (tensile) FPZ length is the stable propagation distance of deflecting HF in each step and besides deteriorates the fracture resistance discontinuity of FPZ developing to be a real tensile fracture. Thus, the mixed-mode (I-II) fracture tends to propagate unstably driven by kinetic energy once FPZ develops completely under fast loading. Moreover, two injection rate-dependent (IRD) HF deflecting propagation modes were determined, i.e., the step-by-step stable-propagation and step-by-step unstable propagation modes. HF deflection occurs in the step alternation of fracture propagation. With the increasing fluid injection rate, the increased FPZ length and kinetic energy (from fracture resistance discontinuity) extend the stable and unstable HF propagation distance along the initial direction in an extension step, respectively. Therefore, fast fluid injection improves the HF deflecting propagation radius; i.e., it inhibits the HF deflecting propagation or promotes HF extension along the initially designed direction. The injection rate-dependent HF deflecting propagation modes (based on the proposed model) were validated by further processing of published true triaxial physical simulation tests of hydraulic fracturing. The ordinal response of Fiber Bragg grating sensors embedded along the fracture propagation path, and the continuous fluctuant injecting pressures validate the step-by-step propagation of the hydraulic fracture. The test-measured deflecting HF trajectory indicates that high fluid injection rates remarkably increase the HF deflecting radius, which is consistent with the theoretical analysis in this work. The above findings can provide theoretical bases for controlling the HF deflecting propagation in the surrounding rock of mines and oil-gas reservoirs.

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Numerical Simulation on Deflecting Hydraulic Fracture with Refracturing Using Extended Finite Element Method

Cited by 17 publications

References 48 publications

Factors Influencing Fracture Propagation in Collaborative Fracturing of Multiple Horizontal Wells

Factors Influencing Fracture Propagation in Collaborative Fracturing of Multiple Horizontal Wells

Hydromechanical coupling model for mechanical and hydraulic behavior of fractured rock mass in the framework of advanced general particle dynamics

Injection Rate-Dependent Deflecting Propagation Rule of Hydraulic Fracture: Insights from the Rate-Dependent Fracture Process Zone of Mixed-Mode (I-II) Fracturing

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