Deformation Behavior between Hydraulic and Natural Fractures Using Fully Coupled Hydromechanical Model with XFEM

Liu, Fei; Luo, Zhifeng; Sang, Yu; Zhao, Liqiang; Zhou, Changlin

doi:10.1155/2017/6373957

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…The diamond-shape inverted nine-spot well pattern has been proven to be superior to others in developing lowpermeability anisotropic hydrocarbon reservoir [2]. Hydraulic fracturing technique is also widely applied to further enhance oil recovery of low permeability reservoirs [3,4]. The fractures can improve the development efficiency of anisotropic hydrocarbon reservoirs [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Fracture Parameter Optimization in Developing Low-Permeability Anisotropic Reservoirs

Liu

Yuan

et al. 2018

Geofluids

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The diamond-shape inverted nine-spot well pattern is widely used in developing low-permeability reservoirs with fractures. However, production wells with equal fracture lengths will lead to nonuniform displacement, especially in anisotropic reservoir. Previous researches mainly focused on equal-length fractures, while studies on the unequal-length fractures which can dramatically improve the development efficiency were little. In this paper, a corresponding numerical model with unequal length of fracture designed in the edge and the corner wells was built in a low-permeability anisotropic reservoir. The main objective was to examine and evaluate the effects of anisotropic permeability and fracture parameter on the waterflooding in the diamond-shape inverted nine-spot well pattern. The results indicate that different fractures penetration ratio and anisotropic permeability both result in different development efficiency. Fracture of the edge well are more easily to be water breakthrough, while the increase of penetration ratio of injection well effectively enhance oil recovery. Moreover, the most optimal penetration ratios of production well fractures under different kx : ky are determined. With the increase of kx : ky, the optimized penetration ratio of corner wells fracture decrease, while that of the edge wells increase. Setting unequal length fractures in low-permeability anisotropic reservoirs can effectively improve the oil displacement efficiency in the waterflooding process.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on Fracture Parameter Optimization in Developing Low-Permeability Anisotropic Reservoirs

Liu

Yuan

et al. 2018

Geofluids

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Influence of existing natural fractures and beddings on the formation of fracture network during hydraulic fracturing based on the extended finite element method

et al. 2020

Geomech. Geophys. Geo-energ. Geo-resour.

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The Influence of the Distribution Characteristics of Complex Natural Fracture on the Hydraulic Fracture Propagation Morphology

Zhao

Wang

et al. 2022

Front. Earth Sci.

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Natural fractures are common in unconventional reservoirs (e.g., tight oil and gas, shale oil and gas), for which hydraulic fracturing is the main exploitation method. Natural fractures influence the propagation and final transformation effect of hydraulic fractures, which is an important factor for fracture optimization design. In this work, the method of globally embedding zero-thickness cohesive zone elements is applied to establish a dynamic propagation model of hydraulic fractures in naturally fractured reservoirs, and the influence of natural fracture development on the fracture propagation patterns is investigated. The results show that the hydraulic fracture propagation paths in fractured reservoirs are highly complex, and steering, branching, and merging of the propagation paths may occur. When the natural fracture development is small, the fracture propagation pattern is mainly influenced by the minimum horizontal principal stress. In contrast, when the natural fracture development is large, the fracture propagation pattern is influenced by the natural fracture distribution. With increasing natural fracture angle, hydraulic fractures can easily pass through natural fractures and form wide fracturs. Higher numbers of natural fracture groups and fractal dimensions increase the number of fracture propagation directions and communicating natural fractures, and the fractures tend to be narrow and complex.

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Deformation Behavior between Hydraulic and Natural Fractures Using Fully Coupled Hydromechanical Model with XFEM

Cited by 3 publications

References 20 publications

Numerical Simulation Study on Fracture Parameter Optimization in Developing Low-Permeability Anisotropic Reservoirs

Numerical Simulation Study on Fracture Parameter Optimization in Developing Low-Permeability Anisotropic Reservoirs

Influence of existing natural fractures and beddings on the formation of fracture network during hydraulic fracturing based on the extended finite element method

The Influence of the Distribution Characteristics of Complex Natural Fracture on the Hydraulic Fracture Propagation Morphology

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