Modeling Simultaneous Multiple Fracturing Using the Combined Finite-Discrete Element Method

Liu, Quansheng; Sun, Lei; Liu, Pingli; Chen, Lei

doi:10.1155/2018/4252904

Cited by 7 publications

(3 citation statements)

References 43 publications

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“…According to the local stress and deformation fields, the fracture unit will yield and fail. There are three failure modes, namely, Mode I tensile failure, Mode II shear failure, and mixed Mode I-II composite failure (Geomechanica Inc, 2018;Liu et al, 2018) (Figure 4).…”

Section: Materials Damage and Failure Modesmentioning

confidence: 99%

“…The Darcy's law and parallel plate cube law are utilized to calculate the fluid flow process in the flow channel. The fluid pressure at the nodes of the fracture network is updated to drive the continuous propagation of the fractures (Labuz et al, 1985;Liu et al, 2018). The hydraulic-mechanical coupling analysis in FDEM adopts a two-way explicit coupling analysis method.…”

Section: Materials Damage and Failure Modesmentioning

confidence: 99%

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Numerical Investigation of the Fracturing Effect Induced by Disturbing Stress of Hydrofracturing

2021

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Fracturing induced by disturbing stress of hydraulic fracturing is the frontier common core scientific problem of reservoir stimulation of coal bed methane and shale gas. The finite-discrete element method, numerical calculation method, is used to analyze the basic law of shear failure and tension failure of natural fractures induced by the disturbing stress of the hydraulic fracture. The simulation results show that when natural fractures and other weak structures exist on the front or both sides of hydraulic fracture, the shear stress acting on the surface of natural fracture will increase until the natural fracture failure, which is caused by the disturbing stress of hydraulic fracturing. The seepage area on the front and both sides of the hydraulic fracture did not extend to the natural fracture while the natural fracture failure occurred. It indicates that the shear failure of natural fractures is induced by the disturbing stress of hydraulic fracturing. When the hydraulic fracture propagates to the natural fracture, the hydraulic tension fracture and disturbed shear fractures are connected and penetrated. As the fluid pressure within the natural fracture surface increases, the hydraulic fracture will continue to propagate through the natural fracture. Meanwhile, due to the action of fluid pressure, a tensile stress concentration will occur at the tip of the natural fracture, which will induce the airfoil tension failure of the natural fracture. With the increase of the principal stress difference, the range of the disturbing stress area and the peak value of the disturbing stress at the front of the hydraulic fracture tip increase, as well as the shear stress acting on the natural fracture surface. During the process of hydraulic fracture approaching natural fracture, the disturbing stress is easier to induce shear failure of natural fracture. With the increase of the cohesive force of natural fracture, the ability of natural fractures to resist shear failure increases. As the hydraulic fracture approaches natural fractures, the disturbing stress is more difficult to induce shear failure of natural fracture. This study will help to reveal the formation mechanism of the fracture network during hydraulic fracturing in the natural fractures developed reservoir.

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Section: Materials Damage and Failure Modesmentioning

confidence: 99%

Section: Materials Damage and Failure Modesmentioning

confidence: 99%

Numerical Investigation of the Fracturing Effect Induced by Disturbing Stress of Hydrofracturing

2021

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“…As a result, the current conventional fracture propagation research methods of shale reservoirs are no longer effective and cannot provide accurate guidance for fracturing operations in deep shale reservoirs (Britt, et al, 1994;Casas, et al, 2006;Zhao, et al, 2018). Then, construction methods such as liquid nitrogen fracturing (Li et al, 2023;Yang et al, 2023a) and multi-cluster fracturing (Liu et al, 2018b;Yuan et al, 2018) have been proposed one after another. Considering that multi-cluster fracturing is currently widely used, the impact mechanism in deep high-ground stress differential reservoirs is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Study on multi-cluster fracturing simulation of deep reservoir based on cohesive element modeling

Wu,

Guo

et al. 2024

Front. Energy Res.

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With the depletion of conventional reservoir development, reservoir fracturing under deep high geo-stress and high geo-stress difference conditions is receiving increasing attention. Deep reservoirs typically require multi-cluster fracturing to achieve efficient reservoir transformation and development. In this paper, considering the relevant geological parameters of a certain reservoir in the southwest, three-dimensional multi-cluster reservoir fracturing models were established based on cohesive element modeling. Then, the propagation law of artificial fractures in reservoirs under the influence of the different number of fracturing clusters, injection displacement, and Young’s modulus in different regions of the 60 m fracturing well section is analyzed, and the quantitative law of parameters such as fracture length, maximum fracture width, injection point fracture width, fracture area, and tensile failure ratio during multi-cluster fracturing construction, as well as the propagation law of fracture morphology are revealed. The simulation results show that using multi-cluster fracturing can significantly improve the effectiveness of reservoir reconstruction, but as the number of fracturing clusters increases, it is also easy to form some small opening artificial fractures. These small opening artificial fractures may not be conducive to the transportation of proppants and fluids. During single cluster fracturing, the interface stiffness and rock Young’s modulus have a significant impact on the propagation of artificial fractures in the reservoir. As the number of fracturing clusters increases, the competition between artificial main fractures expands significantly, which may reduce the impact of interface stiffness and rock Young’s modulus. The fluid injection rate has a significant impact on reservoir fracturing, and in the same area, using high displacement injection can significantly increase the volume of reservoir reconstruction. This study can provide some reference for multi-cluster fracturing construction in deep reservoirs.

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Exploring the effect of engineering parameters on the penetration of hydraulic fractures through bedding planes in different propagation regimes

Zheng

Huang

et al. 2022

Computers and Geotechnics

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Modeling Simultaneous Multiple Fracturing Using the Combined Finite-Discrete Element Method

Cited by 7 publications

References 43 publications

Numerical Investigation of the Fracturing Effect Induced by Disturbing Stress of Hydrofracturing

Numerical Investigation of the Fracturing Effect Induced by Disturbing Stress of Hydrofracturing

Study on multi-cluster fracturing simulation of deep reservoir based on cohesive element modeling

Exploring the effect of engineering parameters on the penetration of hydraulic fractures through bedding planes in different propagation regimes

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