Complex wettability behavior triggering mechanism on imbibition: A model construction and comparative study based on analysis at multiple scales

Liu, Qiang; Li, Jialong; Li, Bing; Li, Jianjun; Sun, Weiji; He, Jie; Lei, Yun

doi:10.1016/j.energy.2023.127434

Cited by 34 publications

(14 citation statements)

References 45 publications

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“…Huang performed simulation to study the interaction between hydraulic fractures and gravels in glutenite formation based on 2D particle discrete element method, and results showed that the non-uniformly distributed stress field caused by the existence of glutenite maily affects the fracture propagating path (Huang et al, 2023b). Although the reservoir types studied are different and the methods used are also varied, these studies have reached similar conclusions regarding the expansion behavior of hydraulic fractures in fractured reservoirs (Song et al, 2017;Tan et al, 2017;Huang et al, 2019;Song et al, 2020;Tan et al, 2020;He et al, 2023;Liu et al, 2023;Wu et al, 2023). They all agreed the significant influence of reservoir heterogeneity and geostress states on the propagation path of hydraulic fractures, as well as the control effect of fracturing fluid flow rate and viscosity on the morphology of hydraulic fracture propagation.…”

Section: Frontiers In Energy Researchmentioning

confidence: 96%

Numerical study of hydraulic fractures propagation in deep fracture-cavity reservoir based on continuous damage theory

Luan,

Liu,

Shan

et al. 2024

Front. Energy Res.

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Natural fractures and cavities are the primary spaces for oil and gas accumulation in fracture-cavity carbonate reservoirs. Establishing the connection between these spaces and the wellbore through hydraulic fracturing treatment is important for oil and gas extraction from such reservoirs. Due to the discontinuity and heterogeneity of the existing natural fracture-cavity system, anticipating the viability of hydraulic fracturing treatment is troublesome. A new method to simulate the hydraulic fracturing propagation in fracture-cavity reservoirs is proposed based on the continuous damage theory. The method considers the random spatial distribution of fractures and cavities and can simulate the arbitrary expansion of hydraulic fractures in the three-dimensional direction. Based on this method, the influence of different geological and engineering factors on the propagation patterns of hydraulic fractures in the fracture-cavity reservoirs is investigated. It is found that the increase of reservoir burial depth significantly limits the propagation ranges of hydraulic fractures. The propagation modes of hydraulic fractures encountering natural fractures change with increasing burial depth, undergoing a transition from “penetrate and deflect” to ”defect” and then to ”penetrate”. The reduction of horizontal stress difference increases the complexity of hydraulic fractures, but it is not conducive for hydraulic fractures to connect more natural fractures and cavities. The increase in fracturing pump rate is significantly beneficial for hydraulic fractures to connect more natural fractures and cavities. The viscosity of fracturing fluid has a significant impact on the morphology of hydraulic fracture propagation, which undergoes a transition from simple to complex, and then to simple with the change of the fracturing fluid viscosity from low to high. either too high or too low viscosity of the fracturing fluid is not conducive to the connection of more natural fractures and cavities by hydraulic fractures. The obtained conclusions can provide a reference for the design of hydraulic fracturing treatment for fracture-cavity carbonate reservoirs.

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Section: Frontiers In Energy Researchmentioning

confidence: 96%

Numerical study of hydraulic fractures propagation in deep fracture-cavity reservoir based on continuous damage theory

Luan,

Liu,

Shan

et al. 2024

Front. Energy Res.

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“…Hydraulic fracturing technology, as an effective permeability enhancement technology for tight reservoirs, has been widely used to enhance the permeability of tight reservoirs, improve the oil and gas production of reservoirs, and achieve efficient and commercial development of tight oil and gas. − Unfortunately, with the increase in mining depth, field monitoring has found that the lithology of deep tight sandstone reservoirs in western China is more complex, and there may be complex natural fractures in local areas. − At the same time, the ground stress of deep reservoirs is greater, so the law of hydraulic fracture initiation and development in shallow reservoirs is no longer applicable, which brings great inconvenience to the efficient exploitation of deep tight sandstone reservoirs in the west. − Therefore, it is extremely necessary to explore the effects of stress difference and natural fracture strength on hydraulic fracture propagation under high geo-stress conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Geo-Stress and Natural Fracture Strength on Hydraulic Fracture Propagation in a Deep Fractured Tight Sandstone Reservoir

Ding,

Meng,

Zhong

et al. 2024

ACS Omega

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Hydraulic fracturing technology has been widely used in the tight reservoir reconstruction. Unfortunately, with the deepening of mining depth and the increase of geo-stress, the propagation mechanism of medium-pressure fractures in the reservoir is significantly different from that of conventional shallow reservoirs. Based on the combined finite discrete element method, this paper conducts numerical simulation research on deep tight sandstone reservoirs in the west. The discrete fracture network modeling method is used to establish a tight sandstone reservoir model with natural bedding, and the influence of geo-stress difference and natural fracture strength on hydraulic fracture propagation law in a high geo-stress environment is discussed in detail. The results show that the difference between geo-stress and the strength of natural fractures has a significant effect on the shape and expansion of hydraulic fractures under the high geo-stress conditions. The greater the difference in ground stress, the more obvious the tendency of the main fractures of the reservoir, and the shorter the branch fractures. With the increase of natural fracture strength, the changes in propagation pressure, fracture length, area, and width, which can be fitted with a linear function with a goodness of fit as high as 0.99. In addition, the morphological results of hydraulic fractures in the simulation are not only affected by the constitutive parameters of the model but also may be affected by the randomness of the natural fracture network, thus, showing a certain degree of dispersion. Therefore, it is extremely necessary to build a reservoir fracturing model in a specific area based on more detailed geological monitoring data to guide actual construction. The above achievements have certain reference significance for the field operation of deep tight sandstone reservoirs.

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“…For geostress, many theories, methods, and applications are still in the exploratory stage (Yang et al, 2013;Song et al, 2017;Song et al, 2020;Liu et al, 2023). Geostress is a key factor affecting shale hydraulic fracturing design (Huang et al, 2019;Zheng et al, 2022;Huang et al, 2023a;He et al, 2023;Tan et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Research on geophysical response analysis and prediction technology of geostress in the shale gas area of the southern Sichuan Basin

Wang,

Yin,

Shi

et al. 2024

Front. Energy Res.

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The exploration and development potential of shale gas reservoirs in the Sichuan Basin is enormous; however, it also faces difficulties such as complex structures, strong heterogeneity, and unclear geophysical response characteristics. Fine prediction of geostress is an important part of shale gas exploration and development, which directly affects the implementation effect of reservoir evaluation, well trajectory design, and fracture reconstruction. The existing geostress prediction techniques lack high-precision seismic data constraints, making it difficult to accurately reflect the planar distribution characteristics of geostress in the block with rapid changes in complex tectonic zones. At the same time, the geophysical response characteristics of geostress in the Sichuan Basin are unknown, and the geostress seismic prediction technology lacks theoretical basis. This paper combines numerical simulation and physical experiments and defines the characteristics of the geophysical response of shale gas reservoirs in the Sichuan Basin changing with the stress field, and technical countermeasures for geostress seismic prediction have been established to provide technical means for accurate prediction of the geostress field in the shale gas block. Based on the geostress sensitive parameters obtained from prestack seismic inversion, the geostress field prediction of a shale gas work area in the Sichuan Basin is realized.

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Complex wettability behavior triggering mechanism on imbibition: A model construction and comparative study based on analysis at multiple scales

Cited by 34 publications

References 45 publications

Numerical study of hydraulic fractures propagation in deep fracture-cavity reservoir based on continuous damage theory

Numerical study of hydraulic fractures propagation in deep fracture-cavity reservoir based on continuous damage theory

Effects of Geo-Stress and Natural Fracture Strength on Hydraulic Fracture Propagation in a Deep Fractured Tight Sandstone Reservoir

Research on geophysical response analysis and prediction technology of geostress in the shale gas area of the southern Sichuan Basin

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