Digital voxel-based fracture extraction: Insights to characterization of single fracture flow and anisotropy permeability

Zhao, Zhi; Zhou, Xiaoping

doi:10.1016/j.jngse.2020.103635

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…Ma et al (2022) developed a model that considers the anisotropy of rock strength to predict FIP for both vertical and inclined boreholes. In addition, the heterogeneity of the reservoir influences the propagation of fractures (Wu et al, 2023), resulting in the creation of intricate fractures (Zhou et al, 2020;Huang et al, 2023b), which also significantly impact the extraction of reservoir gas (Zhao and Zhou, 2020b;Song et al, 2020). Therefore, it is crucial to consider the effect of reservoir anisotropy on the efficiency of hydraulic fracturing.…”

Section: Introductionmentioning

confidence: 99%

Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Wang,

Niu

et al. 2024

Front. Earth Sci.

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Accurately predicting fracture initiation pressure is crucial for successfully applying hydraulic fracturing technology in layered reservoirs. However, existing models overlook the effects of rock anisotropy and borehole deformation. In this study, we simplified the layered reservoir to a transversely isotropic medium and developed a model to estimate borehole deformation precisely. Based on this estimated deformation, we created a model to predict fracture initiation pressure in hydraulic fracturing. By comparing previous models and experimental data, we validated the effectiveness of these proposed models. We examined the impacts of various factors on borehole deformation, fracture initiation pressure, and initiation angle. The results revealed that circular boreholes in layered reservoirs deform into elliptical boreholes under in situ stress, with the major axis not aligning with the principal stress direction, which highlights the significant impact of rock anisotropy on borehole deformation. Furthermore, the fracture initiation pressure of hydraulic fracturing either increases or decreases following borehole deformation, depending on specific geological parameters. The calculated initiation angle after borehole deformation is within 10°, closer to previous experimental results, underscoring the notable effect of borehole deformation on hydraulic fracturing. Our research indicates that the impact of borehole deformation on hydraulic fracturing is significant and should not be overlooked. This finding will offer fresh avenues for further study in the field of hydraulic fracturing.

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Section: Introductionmentioning

confidence: 99%

Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Wang,

Niu

et al. 2024

Front. Earth Sci.

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“…Liu et al studied the effects of different fractal dimensions, fracture width, and inlet pressure on fracture flow characteristics by numerical simulation of a single fracture [20]. Zhao et al conducted numerical simulation of single-phase laminar flow and studied the seepage characteristics of single fracture in different projection directions [21]. Xieet al combined with 3D printing technology to establish solid cross-fracture models with different fractal dimensions, quantitatively evaluated and discussed the pressure drop loss and competitive diversion behavior of two fractures with different fractal dimensions [22].…”

Section: Introductionmentioning

confidence: 99%

Study on seepage characteristics of cross fractures in adjacent and convective flow modes

et al. 2023

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The distribution of fractures in the underground rock mass is complex, so it is of great significance to study the parameter characteristics of fracture seepage for geothermal exploitation, land subsidence, and other fields. Based on the Weierstrass-Mandelbrot function, several X-shaped fracture models with different roughness are established, and the fracture seepage law under different roughness and inlet pressure is studied. At the same time, the center (cross-region) of the X-shaped fracture is selected as the research object, and the seepage difference characteristics of the cross-region under the two inlet modes of adjacent flow and convective flow are compared and analyzed. The results show that the outlet velocity of fracture fluid is inversely proportional to the fractal dimension and is directly proportional to the inlet pressure.

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“…Zhou et al (2020) and Zhao et al (2020) proposed a novel double threshold segmentation algorithm to segment cracks, pores, and grains, and pore-scale variables are defined and extracted from these X-ray CT images to study the geometric characteristics of microstructures of porous geomaterials. Zhao and Zhou, (2020a), Zhao and Zhou, (2020b), ;; Zhou and Zhao, (2019) successfully predicted the permeability of soil by establishing a model through X-ray CT imaging test, analyzed the internal microstructures of FC and their effects on the compressive strength and permeability, and studied the hydraulic transport properties and fluid flow in single fractures from different projection directions. Zhao et al (2021) established a digital quantum mechanism-based neural network (DQNN) to study the permeability using digital porosity, coordination number, and pore network size.…”

Section: Introductionmentioning

confidence: 99%

Determination of hydraulic parameters of non-linear consolidation clay layers by type curve method

Wang

Li²,

Xu³

et al. 2023

Front. Earth Sci.

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The consolidation of clay layers is of great significance for groundwater environmental protection, groundwater storage utilization, and land subsidence. In this study, the governing equation for the excess pore water pressure during the non-linear consolidation process of clay layers under load conditions is obtained based on the one-dimensional non-linear consolidation theory. Analytical solutions are then derived for clay layers with single or double drainage caused by the dissipation of the excess pore water pressure. With these analytical solutions, the groundwater dynamics and deformation of the clay layer are analyzed. Correspondingly, a type curve method is proposed to calculate the hydraulic parameters of the clay layer through laboratory experiments, which verifies the reliability of the analytical solutions. The study results show that the deformation of the clay layer predicted by the non-linear consolidation theory is smaller than that predicted by the linear consolidation theory. The deformation of the clay layer increases with the increase in the thickness of the clay layer, the compressive index, and the overburden load, while it decreases with the increase in the initial void ratio and the initial effective stress. The stable time, at which the consolidation of the clay layer is completed, increases with the increase in the compression index and the thickness of the clay layer, while it decreases with the increase in the initial void ratio, the initial effective stress, and the initial hydraulic conductivity. It does not vary with the load pressure. Conclusively, the deformation prediction based on the non-linear consolidation theory is more accurate and applicable to further load pressures.

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Digital voxel-based fracture extraction: Insights to characterization of single fracture flow and anisotropy permeability

Cited by 4 publications

References 30 publications

Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Fracture initiation pressure prediction of hydraulic fracturing for layered reservoirs considering borehole deformation

Study on seepage characteristics of cross fractures in adjacent and convective flow modes

Determination of hydraulic parameters of non-linear consolidation clay layers by type curve method

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