A numerical simulation study of fracture reorientation with a degradable fiber-diverting agent

Wang, Daobing; Zhou, Fujian; Wei, Ding; Ge, Hongkui; Jia, Xiaohan; Yang, Shenglai; Wang, Xiaoqiong; Yan, Xingming

doi:10.1016/j.jngse.2015.05.002

Cited by 44 publications

(10 citation statements)

References 11 publications

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“…When the stress difference exceeded 10 MPa, the deflection angles decreased to less than 20 • , demonstrating a rapid deflection in the direction of the original maximum principal stress. Wang et al [45] similarly concluded that the diverting fracture does not initiate in a new direction with a large stress difference. Therefore, a lower stress difference can result in the preferred fracture geometries of refracturing and can easily redirect the in situ stress field.…”

Section: Horizontal Stress Differencementioning

confidence: 99%

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

Dong

Hua

et al. 2019

Energies

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Refracturing is a key technology in enhancing the conductivity of fractures from hydraulically-fractured wells. However, the deflecting mechanism of the diverting fracture is still unclear. In this paper, a fully coupled seepage-stress model based on the extended finite element method (XFEM) was developed to realize the deflection mechanism of the refracturing fractures. The modified construction of refracturing was then verified by laboratory experiments. Furthermore, two new deflection angles considering the influence area along initial fracture length were introduced to evaluate the refracturing. The numerical results demonstrated that: (1) lower stress difference, larger perforation angle and longer perforation depth can lead to a higher deflection angle, thereby a more curving propagation path of the diverting fracture; (2) increasing injection rate or fluid viscosity can significantly enhance the diverting behavior; and (3) an initial location near the root of the initial fracture results in a larger value of the deflection angle, which is preferred for far-field refracturing. The conclusions in this study can be a systematic guide for the parameter optimization in refracturing treatment.

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Section: Horizontal Stress Differencementioning

confidence: 99%

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

Dong

Hua

et al. 2019

Energies

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“…At last, influenced by reservoir temperature and reservoir fluids for a certain time, diverting agents will automatically degrade and the tight sealers will be removed completely. Thus all of the created fractures will recover their flow conductivity (Figure 1(d)) [32].…”

Section: Mechanisms Of Separate-layer Fracturing With Temporary Pluggingmentioning

confidence: 99%

Evaluations of Fracture Injection Pressure and Fracture Mouth Width during Separate-Layer Fracturing with Temporary Plugging

Wang

Zhou

Liang

et al. 2018

Mathematical Problems in Engineering

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Separate-layer fracturing with temporary plugging (SLFTP) is a potential way to stimulate multiple layer reservoirs due to its low cost, low risk, and high efficiency. In this study, based on the cohesive zone model (CZM), a 3D fully fluid-solid coupling and multiple layer model is established to investigate factors influencing fracture injection pressure and fracture mouth width. The cohesive layer properties are based on the reported study, which have been validated through a series of numerical experiments. Innovatively, the spring model is innovatively proposed to represent the plugging effect of diverting agents and prop the aperture of the previous fractures. Simulation results reveal that the effects of previous fractures in multiple layer formations can be neglected, which is quite different from multistage fracturing for horizontal wells. Fracture injection pressure can be evaluated more accurately by taking the following factors into consideration: the minimum horizontal principal stress, rock tensile strength, injection rate, and pore pressure enhancement. Further, fracture mouth width is strongly influenced by rock tensile strength, Young’s modulus, and injection rate. This study provides a guidance for candidate well selection and diverting agent optimization during SLFTP in multilayer formations.

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“…In this model, no gap between the fracture tip and fluid front is assumed because of the low viscosity of fracturing fluids. The stress equilibrium equation in the domain and associated boundary conditions can be written as [31][32][33][34][35][36]:…”

Section: Governing Equationsmentioning

confidence: 99%

Failure Patterns and Mechanisms of Hydraulic Fracture Propagation Behavior in the Presence of Naturally Cemented Fractures

Wang¹,

Shi²,

Qin³

et al. 2021

Computer Modeling in Engineering &Amp; Sciences

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In this study, we use the extended finite element method (XFEM) with a consideration of junction enrichment functions to investigate the mechanics of hydraulic fractures related to naturally cemented fractures. In the proposed numerical model, the lubrication equation is adopted to describe the fluid flow within fractures. The fluid-solid coupling systems of the hydraulic fracturing problem are solved using the Newton-Raphson method. The energy release rate criterion is used to determine the cross/arrest behavior between a hydraulic fracture (HF) and a cemented natural fracture (NF). The failure patterns and mechanisms of crack propagation at the intersection of natural fractures are discussed. Simulation results show that after crossing an NF, the failure mode along the cemented NF path may change from the tensile regime to the shear or mixed-mode regime. When an advancing HF kinks back toward the matrix, the failure mode may gradually switch back to the tensile-dominated regime. Key factors, including the length of the upper/lower portion of the cemented NF, horizontal stress anisotropy, and the intersection angle of the crack propagation are investigated in detail. An uncemented or partially cemented NF will form a more complex fracture network than a cemented NF. This study provides insight into the formation mechanism of fracture networks in formations that contain cemented NF.

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A numerical simulation study of fracture reorientation with a degradable fiber-diverting agent

Cited by 44 publications

References 11 publications

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

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

Evaluations of Fracture Injection Pressure and Fracture Mouth Width during Separate-Layer Fracturing with Temporary Plugging

Failure Patterns and Mechanisms of Hydraulic Fracture Propagation Behavior in the Presence of Naturally Cemented Fractures

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