Laboratory visualization of supercritical CO2 fracturing in tight sandstone using digital image correlation method

Zang, Yuxi; Wang, Quan; Wang, Haizhu; Wang, Bin; Tian, Kangjian; Wang, Tianyu; Li, Jie; Zhang, Zhichao; Tian, Shouceng; Stanchits, Sergei

doi:10.1016/j.geoen.2023.211556

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…Being able to provide detailed information on large-scale spatial dislocation and strain fields, comparing and recording the sample surface during the loading process, in this way, it is possible to quantify the strain to which the material is being submitted. Compared to other methods based on the use of conventional sensors, it also has the advantage of good environmental adaptability, wide measurement range and high degree of automation (Zang, Wang et al 2023), Characterization tools, such as the electron backscattered diffraction (EBSD) technique, allow the evaluation of crystalline structures in the material and provide information on texture, grain size, misdirection between boundaries and local disorientations, as well as measurements of elastic deformation and estimation of GND, providing quantitative information about the plastic behavior of the material at the microscale (Koko, Tong et al 2023). In addition, through the EBSD technique, it is possible to obtain information about texture, grain size, disorientation between contours (for example, grain boundaries) and local disorientations in the crystal, in addition to more refined information such as the phases and orientations of the planes present in the crystal, which can be adequately quantified from the intensity distributions within the Kikuchi bands (Koko, Tong et al 2023).…”

Section: )mentioning

confidence: 99%

Quantitative Metallographic Analysis of the Effect of Mechanical Deformation in Trip Steels

Santos,

Farias,

Ferreira

et al. 2023

ABM Proceedings

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The growth of the automotive sector has set new standards for the production and application of modern materials. Current vehicle models require a design that enables weight reduction, greater resistance and safety against collisions. Consequently, advanced high strength steels (AHSS) have been innovatively produced to meet these needs. In this scenario, TRIP (Transformation Induced Plasticity) steels play a crucial role in the automotive sector. Hardening, induced by phase transformation by plastic deformation, increases the strength of the system with TRIP steels in its structure. To obtain information about the conformability of these new materials, an experimental analysis was performed using Digital Image Correlation (DIC) techniques to evaluate the transformation of the metastable austenite present in the microstructure of the material into martensite. Samples under different stress levels were evaluated by the electron backscatter diffraction technique (EBSD), the results suggested that increasing levels of strain lead to a reduction in retained austenite due to an increase in dislocation density, which in turn leads to stabilization of retained austenite. The results of this study can contribute to the development of more effective strategies for the production of AHSS, in addition to helping to understand the behavior of TRIP steels during deformation.

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Section: )mentioning

confidence: 99%

Quantitative Metallographic Analysis of the Effect of Mechanical Deformation in Trip Steels

Santos,

Farias,

Ferreira

et al. 2023

ABM Proceedings

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“…The study of microscopic visualization of displacement in tight sandstone reservoirs is crucial for improving oil recovery [35]. Currently, various models are used for this purpose, including nonconsolidated filling model [36,37], capillary model [38], simulation two-dimensional model [39,40], and real three-dimensional core model [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

The Microscopic Production Characteristics of CO2 Flooding AF-Ter Water Flooding for Tight Oil Sandstones Reservoirs Utilized NMR and Microscopic Visualization Apparatus

Xue,

Gao,

et al. 2024

Preprint

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The microscopic pore structure of tight sandstone reservoir significantly influences the characteris-tics of CO2 flooding after water flooding. The research was conducted using various techniques such as casting thin sections, high pressure mercury injection, scanning electron microscopy, Nu-clear magnetic resonance (NMR) testing, and a self-designed high-temperatures and high-pressures microscopic visualization displacement system. Three type cores with different pore structures were selected for the flooding experiments and the microscopic visualization displace-ment experiments, including CO2 immiscible flooding, near-miscible flooding, and miscible flood-ing after the conventional water flooding. The characteristics of CO2 flooding and the residual oil distribution after water flooding were quantitatively analyzed and evaluated. The results show that: (1) During the water flooding process, the oil produced from type I and type III samples mainly comes from large and some medium pores. Oil utilization of all pores is significant for type II samples. The physical properties and pore types have a greater impact on water flooding. Type I and II samples are more suitable for near-miscible flooding after water flooding. Type III samples are more suitable for miscible flooding after water flooding. (2) In the CO2 flooding, oil recovery increases gradually with increasing pressure for all three types of samples. Type II core samples have the highest recovery. Before miscibility, the oil recovered from type I and type II samples was primarily from large pores, however, the oil recovery mainly comes from medium pores when reaching miscibility. As for the type III samples, the oil produced in the immiscible state mainly comes from large and medium pores, and the enhanced oil recovery mainly comes from medium and small pores after reaching the near-miscible phase. (3) It can be seen from the microscopic re-sidual oil distribution that oil recovery will increase as the petrophysical properties of the rock model improve. The oil recovery of near-miscible flooding after water flooding regarding the type II model is up to 68.11%. The oil recovery of miscible flooding after water flooding about type III model is the highest at 74.57%. With increasing pressure, the proportion of flake residual oil grad-ually decreases, while the proportion of droplet-like and film-like residual oil gradually increases. Type II samples have a relatively large percentage of reticulated residual oil in the near-miscible stage.

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“…The study of microscopic visualization of displacement in tight sandstone reservoirs is crucial for improving oil recovery [32]. Currently, various models are used for this purpose, including the non-consolidated filling model [33,34], capillary model [35], simulation twodimensional model [36][37][38], and real three-dimensional core model [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Microscopic Production Characteristics of CO2 Flooding after Water Flooding in Tight Oil Sandstone Reservoirs Utilizing NMR and Microscopic Visualization Apparatus

Xue,

Gao,

et al. 2024

Atmosphere

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The microscopic pore structure of tight sandstone reservoirs significantly influences the characteristics of CO2 flooding after water flooding. This research was conducted using various techniques such as casting thin sections, high-pressure mercury injection, scanning electron microscopy, nuclear magnetic resonance (NMR) testing, and a self-designed high-temperature and high-pressure microscopic visualization displacement system. Three types of cores with different pore structures were selected for the flooding experiments and the microscopic visualization displacement experiments, including CO2 immiscible flooding, near-miscible flooding, and miscible flooding after conventional water flooding. The characteristics of CO2 flooding and the residual oil distribution after water flooding were quantitatively analyzed and evaluated. The results show the following: (1) During the water flooding process, the oil produced from type I and type III samples mainly comes from large and some medium pores. Oil utilization of all pores is significant for type II samples. The physical properties and pore types have a greater impact on water flooding. Type I and II samples are more suitable for near-miscible flooding after water flooding. Type III samples are more suitable for miscible flooding after water flooding. (2) In CO2 flooding, oil recovery increases gradually with increasing pressure for all three types of samples. Type II core samples have the highest recovery. Before miscibility, the oil recovered from type I and type II samples is primarily from large pores; however, oil recovery mainly comes from medium pores when reaching miscibility. As for the type III samples, the oil produced in the immiscible state mainly comes from large and medium pores, and the enhanced oil recovery mainly comes from medium and small pores after reaching the near-miscible phase. (3) It can be seen from the microscopic residual oil distribution that oil recovery will increase as the petrophysical properties of the rock model improve. The oil recovery rate of near-miscible flooding after water flooding using the type II model is up to 68.11%. The oil recovery of miscible flooding after water flooding with the type III model is the highest at 74.57%. With increasing pressure, the proportion of flake residual oil gradually decreases, while the proportion of droplet-like and film-like residual oil gradually increases. Type II samples have a relatively large percentage of reticulated residual oil in the near-miscible stage.

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Laboratory visualization of supercritical CO2 fracturing in tight sandstone using digital image correlation method

Cited by 5 publications

References 26 publications

Quantitative Metallographic Analysis of the Effect of Mechanical Deformation in Trip Steels

Quantitative Metallographic Analysis of the Effect of Mechanical Deformation in Trip Steels

The Microscopic Production Characteristics of CO2 Flooding AF-Ter Water Flooding for Tight Oil Sandstones Reservoirs Utilized NMR and Microscopic Visualization Apparatus

Analyzing the Microscopic Production Characteristics of CO2 Flooding after Water Flooding in Tight Oil Sandstone Reservoirs Utilizing NMR and Microscopic Visualization Apparatus

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