Thermo-hydro-mechanical coupling simulation for fracture propagation in CO2 fracturing based on phase-field model

Li, Yuwei; Peng, Genbo; Tang, Jizhou; Zhang, Jun; Zhao, Wanchun; Liu, Bo; Yi-shan, Pan

doi:10.1016/j.energy.2023.128629

Cited by 20 publications

(5 citation statements)

References 34 publications

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“…In addition, more related studies were conducted from the theoretical perspective. − Liu et al defined a geomechanical model to include the interactions of fluid flow, adsorption-induced expansion stress, solid deformation, and damage to quantify the rock-gas interactions during supercritical CO 2 fracturing of shale gas. Liu et al established a new numerical model to simulate the supercritical CO 2 fracturing; the numerical model couples an amorphous flow model based on the pore-scale network method and a solid model based on the finite element method with cohesive zone cells, and the amorphous flow model reproduces the two-phase flow by considering viscous and capillary forces on the pore scale.…”

Section: Introductionmentioning

confidence: 99%

Influence of Supercritical CO₂ Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

Sun,

Zhao,

Wang

et al. 2024

Energy Fuels

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To investigate the fracture morphology and expansion characteristics of coal seams by different fracturing methods using supercritical CO 2 , we carried out supercritical CO 2 fracturing of coal bodies and analyzed the temporal and spatial evolution characteristics of coal body fractures based on the pressure−time curves, otoacoustic emission events, and CT structural characterization of coal samples. The following conclusions were made: (1) Tiny fluctuations were observed in the time−pressure curves before fracture, which indicated that the microfracture appeared in the specimen; when a larger range of fissures was produced in the coal sample, the pressure dropped rapidly. (2) The acoustic emission events indicated that the fracturing by supercritical CO 2 under the incremental temperature and incremental pressure injection method was stronger than that under the continuous injection method. (3) Compared with hydraulic fracturing, supercritical CO 2 fracturing showed smaller fracture tip lag lengths, smaller intruding pore throat widths, and more complex phase changes in fracture extension.

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Section: Introductionmentioning

confidence: 99%

Influence of Supercritical CO₂ Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

Sun,

Zhao,

Wang

et al. 2024

Energy Fuels

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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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“…In conventional water flooding and gas flooding, there is a competitive effect between large-sized high permeability fractures and small-sized low permeability fractures in the fracture environment of the reservoir to accommodate the injected oil displacement fluid. − Due to the high permeability of large fractures, injected fluid tends to flow first from inside them. When the flow path of the fluid in the high permeability fracture is opened, it will form a shielding effect on the flow of the subsequently injected fluid in the low permeability channel, and the low permeability channel is difficult to introduce into the fluid flow .…”

Section: Introductionmentioning

confidence: 99%

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

Li,

Feng,

Wang

et al. 2024

ACS Omega

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This study focuses on the characteristics of foam generation, flow, and plugging in different reservoir fracture environments. Through visual physical model experiments and stone core displacement experiments, we analyze the flow regeneration of foam in a simulated reservoir fracture environment as well as its sealing and sweeping mechanisms. The findings reveal that low permeability reservoirs, with their smaller and more intricate fracture structures, are conducive to the generation of high-strength foam. This is due to the stronger shear effect of these fracture structures on the injected surfactant and gas mixture system, resulting in a denser foam system. Consequently, low permeability reservoirs facilitate a series of mechanisms that enhance the fluid sweep efficiency. Furthermore, the experiments demonstrate that higher reservoir fracture roughness intensifies the shear disturbance effect on the injected fluid. This disturbance aids in foam regeneration, increases the flow resistance of the foam, and helps to plug high permeability channels. As a result, the foam optimizes the injection-production profile and improves the fluid sweep efficiency. Stone core displacement experiments further illustrate that during foam flooding, the foam liquid film encapsulates the gas phase, thereby obstructing fluid channeling through the Jamin effect. This forces the subsequently injected fluid into other low-permeability fractures, overcoming the shielding effect of high-permeability fractures on low-permeability fractures. Consequently, this improves the fluid diversion rate of low permeability fractures, effectively inhibiting fluid cross-flow and enhancing sweep efficiency. These experimental results highlight the advantages of foam flooding in the development of complex reservoirs with low permeability fracture structures, demonstrating its efficacy in inhibiting fluid cross-flow and optimizing the injection-production profile.

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Thermo-hydro-mechanical coupling simulation for fracture propagation in CO2 fracturing based on phase-field model

Cited by 20 publications

References 34 publications

Influence of Supercritical CO₂ Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

Influence of Supercritical CO₂ Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

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

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

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Thermo-hydro-mechanical coupling simulation for fracture propagation in CO2 fracturing based on phase-field model

Cited by 20 publications

References 34 publications

Influence of Supercritical CO2 Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

Influence of Supercritical CO2 Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

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

Study on Formation and Migration Law of Foam in Fractures and Its Influencing Factors

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Influence of Supercritical CO₂ Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal

Influence of Supercritical CO₂ Fracturing Mode on the Fracture Morphology and Propagation Characteristics of Coal