Numerical evaluation of refracturing fracture deflection behavior under non-uniform pore pressure using XFEM

Liao, Songze; Hu, Jinghong; Zhang, Yuan

doi:10.1016/j.petrol.2022.111074

Cited by 10 publications

(2 citation statements)

References 40 publications

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“…The BK fracture criterion was adopted as the damage evolution criterion . The BK fracture criterion accurately describes the evolution of damage during fracture extension when the critical energy of deformation of the Cohesive unit along the first and second shear directions is the same: G n C + ( G normals normalC − G normaln normalC ) true{ G s + G t G n + G s + G t true} η = G c where G n C and G s C are the critical fracture energies in the normal and shear directions, N/m, G n , G s , and G t are the energies consumed in the normal, first, and second shear directions, N/m, respectively, and η is the rock-related constant and takes the value 2 …”

Section: Mathematical Modelmentioning

confidence: 99%

Influence of Engineering Parameters on Fracture Vertical Propagation in Deep Shale Reservoir: A Numerical Study Based on FEM

Zhang,

Liao,

et al. 2024

ACS Omega

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The geometry of hydraulic fractures in deep shale facies is significantly affected by the longitudinal inhomogeneity of rock physical properties and stresses. Numerous studies have been conducted on the influence of the longitudinal inhomogeneity of rocks on fracture morphology. However, there is still a lack of research that simultaneously considers the reservoir dip, bedding plane interface, and longitudinal inhomogeneity of the reservoir. To fill this gap, a three-dimensional (3D) numerical model of multireservoir hydraulic fracturing, which takes into account the bedding plane interface, was developed using the finite element method (FEM). The Drucker−Prager elastic-plasticity criterion was incorporated to accurately represent the plasticity of deep shale. The research revealed the influence of the formation dip angle on fracture morphology. Additionally, the perforation layer position and pump rate were optimized based on the actual geological parameters in North Jiangsu shale reservoir. The study findings indicate that reservoir fractures with a formation dip are easily detected by the interface. However, it is not necessarily true that the larger the formation dip, the easier it is for fluids to enter the interface. Fracturing from high-strength and stress reservoirs to lower reservoirs promotes the propagation of fracture height and the connectivity of multiple reservoirs. On the other hand, fractures initiated from low-strength and stress reservoirs tend to be confined to adjacent reservoirs more easily. The pump rate significantly affects the vertical propagation of fractures. At high interface strength, fractures with pump rate below 2.4 m 3 /min can only propagate at the perforation layer. The limited fracture height in shale reservoirs is likely due to substantial energy consumption by the fracturing fluid at the bedding plane interface. These studies offer theoretical guidance for understanding the vertical propagation of fractures in a deep multilayer reservoir.

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Section: Mathematical Modelmentioning

confidence: 99%

Influence of Engineering Parameters on Fracture Vertical Propagation in Deep Shale Reservoir: A Numerical Study Based on FEM

Zhang,

Liao,

et al. 2024

ACS Omega

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“…Wang et al (2022) established a three-dimensional numerical model of conventional refracturing and a temporary plugging refracturing numerical model based on the discrete point matrix method and discussed the effects of key parameters such as injection rate, cluster spacing, and cluster number on multicluster fracture propagation in refracturing. Liao et al (2022) used the extended finite element method to create a model that coupled the first fracturing, water injection, and refracturing processes to optimize the refracturing orientation under heterogeneous pore pressure. Wang et al (2023) clarified the refracturing effect of a low-permeability reservoir under the condition of a five-point well pattern through laboratory experiments, revealed the refracturing mechanism of a straight horizontal well combination, and analyzed the dynamic characteristics of reservoir production under different soaking times.…”

Section: Introductionmentioning

confidence: 99%

Refracturing time optimization considering the effect of induced stress by pressure depletion in the shale reservoir

Wang,

Yang,

Wang

et al. 2024

Preprint

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Refracturing is an important technology for tapping remaining oil and gas areas and enhancing recovery in old oilfields. However, a complete and detailed refracturing timing optimization scheme has not yet been proposed. In this paper, based on the finite volume method and the embedded discrete fracture model, a new coupled fluid-flow/geomechanics pore-elastic-fractured reservoir model is developed. The COMSOL commercial software was used to verify the accuracy of our model, and by studying the influence of matrix permeability, initial stress difference, cluster spacing and fracture half-length on the orientation of maximum horizontal stress, a timing optimization method for refracturing is proposed. The results of this paper show that the principle of optimizing the refracturing timing is to avoid the time window where the percentage of type-I (Type I indicates that stress inversion has occurred, \({0^ \circ } \leqslant \alpha \leqslant {20^ \circ }\); Type II indicates that the turning degree is strong, \({20^ \circ }<\alpha \leqslant {70^ \circ }\); and Type III indicates less stress reorientation, \({70^ \circ }<\alpha \leqslant {90^ \circ }\).) stress reorientation area is relatively large, so that the fractures can extend perpendicular to the horizontal wellbore. At the same time, the simulation results show that with the increase of production time, the percentage of type-I and type-II increases first and then decreases, while the percentage of type III decreases first and then increases. When the reservoir permeability, stress difference and cluster spacing are larger, the two types of refracturing measures can be implemented earlier. But With the increase of fracture half-length, the timing of refracturing method I is earlier, and the timing of refracturing method II is later. The research results of this paper are of great significance to the perfection of the refracturing theory and the optimization of refracturing design.

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Mechanical Behavior of Multi-fracturing Under Confining Pressure: Effects of Borehole Diameter and Rock Type

Ma,

Wu,

Geng

et al. 2024

Rock Mech Rock Eng

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Numerical evaluation of refracturing fracture deflection behavior under non-uniform pore pressure using XFEM

Cited by 10 publications

References 40 publications

Influence of Engineering Parameters on Fracture Vertical Propagation in Deep Shale Reservoir: A Numerical Study Based on FEM

Influence of Engineering Parameters on Fracture Vertical Propagation in Deep Shale Reservoir: A Numerical Study Based on FEM

Refracturing time optimization considering the effect of induced stress by pressure depletion in the shale reservoir

Mechanical Behavior of Multi-fracturing Under Confining Pressure: Effects of Borehole Diameter and Rock Type

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