Pulse effects on proppant transport and dune shape in vertical fracture applied in coalbed methane mining engineering during the pulse hydraulic fracturing

Li, Heng; Huang, Bingxiang; Han, Xiaoke; Wu, Zhanwei; Li, Haoze; Zhao, Xinglong

doi:10.1016/j.geoen.2023.212128

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…3 Hydraulic fracturing is the main technique for stimulating CBM reservoirs production and has garnered significant attention in recent years. 4 Researchers in the unconventional industry have concentrated on diagnosing the morphology of hydraulic fracturing to improve efficiency. 5 Optimizing hydraulic morphology can increase production while lowering completion costs.…”

Section: Introductionmentioning

confidence: 99%

“…Developing CBM is beneficial for optimizing the energy structure, supplementing clean energy, and reducing carbon emissions, thus contributing to achieving carbon peaking and carbon neutrality goals . Hydraulic fracturing is the main technique for stimulating CBM reservoirs production and has garnered significant attention in recent years . Researchers in the unconventional industry have concentrated on diagnosing the morphology of hydraulic fracturing to improve efficiency .…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Deep Learning Approach for Hydraulic Fracture Morphology Diagnosis in Coalbed Methane Wells

Yang,

Gou,

Min

et al. 2024

Energy Fuels

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Accurately diagnosing hydraulic fracture morphology is crucial for coalbed methane (CBM) development and strategy formulation. However, achieving precise and efficient diagnosis of fracture morphology remains a challenge in complex geological and engineering environments. Therefore, this study proposes a hybrid deep learning method based on multivariate time series classification. In this method, the fracturing curve is compared to the "language" of the CBM reservoir, with fracture morphology representing the semantics of this "language". This method integrates a wavelet transform module and a deep encoder−decoder module. The wavelet transform module aims to reduce signal noise and enhance model robustness, while the deep encoder−decoder module extracts latent features from the fracturing curve. Integrating hydraulic fracture morphology recognition into a hybrid deep learning model composed of diverse deep neural networks tailored for specific predictive tasks maximizes the strengths of each network component. This approach was evaluated using real data from CBM blocks in Northern China, supported by ablation experiments, numerical simulations, and microseismic interpretation, demonstrating its effectiveness and applicability. In contrast to traditional time series deep learning models, this method enables more robust extraction of advanced temporal features and delivers high-precision predictions. This novel approach provides an effective solution for diagnosing hydraulic fracturing morphology and contributes to guiding refracturing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Deep Learning Approach for Hydraulic Fracture Morphology Diagnosis in Coalbed Methane Wells

Yang,

Gou,

Min

et al. 2024

Energy Fuels

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“…Huang et al (2021) proposed a continuum model for simulating proppant transport and fluid flow in hydraulic fractures. Isaev et al (2023) proposed adaptive seeding/reseeding methods with exact integration of particles trajectories and local time step refinement in the vicinity of injection zones In these studies, equations describing the migration and sedimentation of proppant were derived based on the solid-liquid coupling relationship and sedimentation law during proppant flow (Hu et al, 2023;Li et al, 2023;Shi, 2016), and most of them were simulated with CFD-DEM (Gong et al, 2023;Liu et al, 2019;Lv et al, 2023;Shi, 2016;Tong and Mohanty, 2016;Xiang and Li, 2023;Zhang et al, 2022Zhang et al, , 2023aZhu et al, 2023) or CFD-XFEM software (Brannon et al, 2005;Qu et al, 2022Qu et al, , 2023Zhang et al, 2023b) such as fluent for two-dimensional and pseudo three-dimensional model. Through numerical simulations of parameters (Hang et al, 2023;Suri et al, 2019Suri et al, , 2020b based on different fracturing fluids and proppant morphologies, the velocity, concentration and pressure distribution of the proppant within the fracture were obtained, and proppant migration and sedimentation patterns were also derived for different fracture morphology parameters and proppant and fluid parameters.…”

Section: Introductionmentioning

confidence: 99%

Simulation and solution of a proppant migration and sedimentation model for hydraulically fractured inhomogeneously wide fractures

Peiqi,

Lin,

et al. 2024

Energy Exploration & Exploitation

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The distribution of proppant during hydraulic fracturing may directly contribute to the flow conductivity of the proppant fracture, so research on the migration and sedimentation of proppant in the fracture and the final distribution pattern is of great relevance. The mass conservation equations of proppant solids and fracturing fluid were adopted to describe the distribution of proppant migration and sedimentation in the fracture, improving the additional gravity coefficient by utilizing the density difference between proppant and fracturing fluid and the concentration of proppant, together with the proppant sedimentation velocity at different Reynolds numbers in this study. The flow coefficients were obtained by discretizing the system of equations through the finite volume method combined with the harmonic mean method and the upstream weight method. The concentration additional pressure gradient term was computed by using the Superbee format innovatively to improve the solution convergence of the model. Numerical simulations with identical parameters were compared with indoor test results, which fully verified the correctness of the model and the accuracy of the discrete solution based on the finite volume method. The effects of flow rate of fracturing fluid, ratio of injected sand, viscosity of fracturing fluid, grain size of proppant and density of proppant on proppant migration and sedimentation based on three elliptical fracture morphologies: even-wide, top-wide and bottom-narrow as well as top-narrow and bottom-wide were investigated and analyzed through comparing the rate of proppant front movement, the level of sweeping range and the degree of inhomogeneity in the range under different conditions. Findings of this study suggest that: (1) top-wide and bottom-narrow fractures are more preferable for homogenous sanding in the early stage of proppant injection, and top-narrow and bottom-wide fractures are best for sanding in the later stage; (2) the viscosity of fracturing fluid is the most influential factor on proppant migration and sedimentation, which increases in the range of 100 mPa.s to enhance the sweeping range and homogeneity of proppant sanding and therefore achieve a better fracturing effect.

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“…In addition, proppant transport in carbon dioxide (Liu et al, 2024), liquid nitrogen, and liquid helium fracturing (Patel et al, 2024) has also been studied based on the Euler method. Li et al (2023) studied the proppant transport process during pulse fracturing in coal seams using Fluent software and pointed out that the proppant can be transported at a longer distance through pulse fracturing. Based on the Euler method, Bhandakkar et al (2020) discussed the proppant transport process under different injection strategies with a stepwise increasing proppant concentration.…”

mentioning

confidence: 99%

Numerical simulation study on the ultimate injection concentration and injection strategy of a proppant in hydraulic fracturing

Wu,

He,

Zeng

et al. 2024

Front. Energy Res.

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The injection volume and the distribution of a proppant inside a fracture have a direct impact on the stimulation effect of fracturing. In this study, a new proppant transport model was established based on the Euler method. In this model, the proppant plugging element allows fluid to pass through. Furthermore, the proppant plugging process was successfully simulated based on this model. The proppant transport and ultimate injection concentration under different injection modes were discussed. The numerical simulation results indicate that compared with the strategy of constant concentration, the strategy of a stepwise increasing concentration can make the proppant distribution in the fracture more uniform. The strategy of injection with a stepwise increasing concentration and a periodic injection with a stepwise increasing concentration can increase the injection volume of the proppant by 25%. In the fracture network, a 67% increase in the number of branch fractures resulted in a 17% increase in the maximum proppant injection volume. If the branch fracture width is reduced by 50%, the maximum proppant injection volume is reduced by 17%.

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Pulse effects on proppant transport and dune shape in vertical fracture applied in coalbed methane mining engineering during the pulse hydraulic fracturing

Cited by 6 publications

References 31 publications

Hybrid Deep Learning Approach for Hydraulic Fracture Morphology Diagnosis in Coalbed Methane Wells

Hybrid Deep Learning Approach for Hydraulic Fracture Morphology Diagnosis in Coalbed Methane Wells

Simulation and solution of a proppant migration and sedimentation model for hydraulically fractured inhomogeneously wide fractures

Numerical simulation study on the ultimate injection concentration and injection strategy of a proppant in hydraulic fracturing

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