Comparative study on hydraulic fracturing using different discrete fracture network modeling: Insight from homogeneous to heterogeneity reservoirs

Wu, Mingyang; Jiang, Changbao; Song, Rui; Li, Jianjun; Li, Minghui; Liu, Bo; Shi, Di; Zhu, Zhengwen; Deng, Bozhi

doi:10.1016/j.engfracmech.2023.109274

Cited by 40 publications

(21 citation statements)

References 66 publications

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“…Due to the limitation of the study of fracture characteristics by laboratory test methods, 30 the influence of the number of Pre‐Existing Fractures on the shape, area, and width of hydraulic fractures is further studied by FDEM. In the FDEM, the deformation behavior of rock element follows linear elastic criterion, and the seepage behavior of rock element follows Darcy law.…”

Section: Discussion and Expansionsmentioning

confidence: 99%

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Chang,

Qiu,

et al. 2024

Energy Science & Engineering

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The formation of complex fracture network is a difficult problem in the process of deep rock reservoir reconstruction, and the key to the generation of intricate fracture systems in deep reservoirs is to communicate more pre‐existing fractures through hydraulic fracturing, so as to enhance oil recovery. At present, there are few studies on the interactions of hydraulic fractures with pre‐existing fractures under high stress. Therefore, this research studied the influence of the number of pre‐existing fractures on the characteristics of hydraulic fractures by using advanced hydraulic fracturing instruments, and then analyzed the characteristics of hydraulic fractures under different pre‐existing fracture number based on three‐dimensional topography scanning technology and three‐dimensional square box fractal dimension calculation method. Based on the three‐dimensional finite element discrete element method, further research is carried out. The laboratory test findings indicated that the increase of pre‐existing fractures will make the pump pressure curve more stable during the test, and will significantly improve the roughness of hydraulic fractures. The numerical simulation indicated that as the quantity of pre‐existing fractures grows, the fracture area and width also increase, and in instances of a substantial quantity of pre‐existing fractures, the hydraulic fractures are prone to bifurcation, which contributes to the development of intricate fracture networks. With the increase of natural fracture angle, the fracture width decreased, but the fracture area increased. In this study, the influence of the number of pre‐existing fractures on hydraulic fracturing was studied through laboratory tests and numerical simulations, which provided theoretical reference for engineering practice.

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Section: Discussion and Expansionsmentioning

confidence: 99%

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Chang,

Qiu,

et al. 2024

Energy Science & Engineering

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“…The other approach treats the reservoir rock as a continuous medium, using methods like the FEM, BEM, and FDM. 96 Different methods have different applicability conditions. For instance, DEM, which considers particle-scale effects, may not be suitable for reservoir-scale computations.…”

Section: Fracture Propagation Model and Simulationmentioning

confidence: 99%

“…One approach considers the discontinuous nature of rocks, employing methods such as FEDM, XFEM, and DEM. The other approach treats the reservoir rock as a continuous medium, using methods like the FEM, BEM, and FDM . Different methods have different applicability conditions.…”

Section: Fracture Propagation Model and Simulationmentioning

confidence: 99%

“…The larger is the Young’s modulus in a region, the easier it is for the fracture to propagate. Therefore, the heterogeneity of mineral composition affects the geometric shape, expansion direction, and distance of fractures. − Previous studies on heterogeneity did not consider the various propagation modes of fractures, such as toughness-dominated (TDR) and viscosity-dominated (VDR) modes. This is an important direction for future research on the impact of heterogeneity on fracture propagation.…”

Section: The Influence Of Geological Factors On Fracture Propagationmentioning

confidence: 99%

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Main Control Factors of Fracture Propagation in Reservoir: A Review

Liu,

Han,

Yang

et al. 2023

ACS Omega

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The fracture distribution and internal control factors after the fracturing of unconventional oil and gas reservoirs determine the reservoir reforming effect to a large extent. Based on the research of global scholars on the influencing factors of fracture propagation, comprehensive theoretical model, and numerical simulation, this Review systematically discusses the influence of internal geological factors and external engineering factors of unconventional oil and gas reservoir on fracture propagation behavior and summarizes the current problems and development trends in fracture research. The results show the following: (1) The fracture propagation is a comprehensive process constrained by lithology and mineral composition, water saturation, nonhomogeneity, natural weak surface, and ground stress. (2) External engineering factors have a meaningful control effect on fracture propagation; the type and temperature of fracturing fluids can also change the mechanical properties of different rocks, thus affecting the fracture propagation pattern. (3) The existing fracture propagation models have certain limitations, and their computational reliability still needs to be further verified. (4) Numerical simulation can break through the limitations of physical simulation, but different simulation methods have different shortcomings and applicability. In the future, we should focus on: (1) finding parameters to quantitatively characterize heterogeneity at the 3D level, which is an important direction to study the effect of heterogeneity on fracture propagation; (2) introducing computerized methods to establish a geological model that considers multiple factors and combining it with numerical simulation software to study fracture propagation; (3) considering the characteristics of fluid–liquid–solid phase comprehensively, establishing a suitable THL coupling equation; (4) how the interaction mode of fracturing fracture is combined with the natural fracture geometry, and how the fracture is affected by fracturing engineering parameters such as fluid injection rate and viscosity of fracturing fluid; and (5) geology-engineering dynamic integration, which is an important direction to be carried out in the future.

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“…For this reason, the fracture network of shale usually requires reconstruction, which is acquired by utilizing high-pressure or shock waves. , In shale gas reservoir stimulation, multistage fracturing technologies are usually used. As the fracturing operation progresses, the surrounding rock of the gas well is in a state of cyclic stress loading–unloading, and the number of cycles increases with the distance of the horizontal section. , In addition, shale gas well usually sets up a cyclic production shutdown period, and the surrounding shale is repeatedly loading and unloading, considerably affecting the gas well production and wellbore safety. − Therefore, it is of great significance to understand how shale permeability is affected under cyclic loading and unloading condition.…”

Section: Introductionmentioning

confidence: 99%

Seepage Characteristics of Broken Carbonaceous Shale under Cyclic Loading and Unloading Conditions

Zhang,

Yuan,

Luo

et al. 2023

Energy Fuels

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This study conducted a seepage experiment of broken shale under cyclic loading and unloading conditions to investigate the permeability characteristics of broken shale with different particle sizes under stress disturbance. There were six groups of broken shale samples with different particle sizes, and three cycles of loading and unloading were conducted to test the permeability of broken shale. The influence of the number of cycles and shale particle size on permeability damage was analyzed. Furthermore, the stress-seepage model of broken shale was established to analyze the influence of the number of cycles and shale particle size on the variation of stress sensitivity of broken shale under different loading and unloading stages. The results show that the initial permeability, permeability damage, and stress sensitivity of broken shale are negatively correlated with the number of cycles and that the first cycle has a significant impact on them. As the size of the broken shale particles increases, the rate of change in shale permeability also increases before and after conducting experiments. This results in a greater shale damage permeability. However, the impact of the number of cycles on shale permeability damage decreases. Additionally, the shale's stress sensitivity becomes stronger. It is also found that the seepage characteristics between the small particle size (G1−G4, 0−6.8 mm) and the large particle size (G5−G6, 7−15 mm) are different in the broken shale samples with six different particle sizes. In addition, the change of the shale particle structure under cyclic loading and unloading conditions is discussed, and the mechanism of the shale permeability change is studied. This study indicates the seepage characteristics of broken shale under cyclic loading and unloading conditions, which has a certain guiding significance for the safe and efficient extraction of shale gas wells.

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Comparative study on hydraulic fracturing using different discrete fracture network modeling: Insight from homogeneous to heterogeneity reservoirs

Cited by 40 publications

References 66 publications

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Research on the impact of pre‐existing geological fractures on hydraulic fracturing in high in situ stress environments

Main Control Factors of Fracture Propagation in Reservoir: A Review

Seepage Characteristics of Broken Carbonaceous Shale under Cyclic Loading and Unloading Conditions

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