Research on Microscopic Characteristics of Remaining Oil Distribution after Strong Alkali ASP Flooding by Laser Scanning Confocal Technology

Liu, Yi Kun; Cai, Ling Zhe; Chen, Ling Yun; Wang, Feng Jiao

doi:10.4028/www.scientific.net/amr.616-618.757

Cited by 6 publications

(9 citation statements)

References 2 publications

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“… 8 With the help of UV excitation, confocal laser microscopy, which is a new nondestructive multilayer morphological detection method, can not only observe the deep internal structure of the sample but also perform high-speed scanning and three-dimensional image reconstruction to reflect the 3D space. 8 , 19 Figure 1 presents the schematic of confocal laser scanning microscopy (CLSM).…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…CLSM uses laser as a point light source to avoid the interference of scattered light and can detect plane to three-dimensional rock samples through multiband and multilayer tomography and receives laser excitation signals at different wavelengths. 19 The confocal principle of CLSM is diagrammatically presented in Figure 1 . The light emitted by the laser passes through the illumination pinhole to form a point light source and then forms parallel light through the lens and dichromatic mirror.…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…However, UV fluorescence excitation can distinguish between the oil and water boundaries and extract the characteristics of the pores, avoiding the problems of unclear fluorescence characteristics of oil and water . With the help of UV excitation, confocal laser microscopy, which is a new nondestructive multilayer morphological detection method, can not only observe the deep internal structure of the sample but also perform high-speed scanning and three-dimensional image reconstruction to reflect the 3D space. , Figure presents the schematic of confocal laser scanning microscopy (CLSM).…”

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

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Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs

et al. 2022

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Polymer flooding is an effective enhanced oil recovery (EOR) technology used in Daqing Oilfield. Microscopic distribution of remaining oil in polymer-flooded reservoirs is more complicated in comparison with waterflooded reservoirs. In this paper, UV excitation, frozen section-laser confocal technology, and three-dimensional reconstruction technology were employed to investigate the distribution law and occurrence state of the microscopic remaining oil in polymer-flooded Daqing Oilfield. With these methods, the occurrence states of the microscopic remaining oil distribution in different washing degrees and displacement locations were analyzed, and the remaining oil distribution before and after polymer flooding was compared quantitatively. The changes and microscopic distribution characteristics of crude oil components in the process of polymer flooding were clarified, and the relationship between clay minerals and the microscopic remaining oil distribution was discussed. Based on the statistical analysis of experimental results, the remaining oil of the free state decreases gradually, while the remaining oil of the bound state increases as the washing degree increases. In addition, the remaining oil in the distributary line is more enriched than the mainstream line after polymer flooding. Compared with waterflooding, the remaining oil of the free state becomes more, while the remaining oil of the bound state becomes less after polymer flooding. The frozen section-laser confocal experimental results also indicate that the proportion and distribution characteristics of the remaining oil components have been changed, and heavy components increase while light components decrease in the polymer-flooded stage. This research performs the quantized characterization and detailed analysis of remaining oil systematically and lays the foundation for remaining oil prediction and potential tapping in polymer-flooded reservoirs.

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Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

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Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs

et al. 2022

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“…Pore structure and physical properties in reservoirs change under the chemical dissolution of rock minerals and the precipitation and agglomeration of clay mineral particles in the pore fluid because of the adsorptionflocculation of the polymer (Kazempour et al, 2013;Huang et al, 2020). Ultimately, all these changes of the pore structure and physical properties of reservoirs will affect the formation and distribution of residual oil (Liu et al, 2013;Liu et al, 2014;Liu et al, 2015;Mansa et al, 2017;Wu et al, 2015b). Therefore, it is significant for the effective development of residual oil to investigate the variation of clay minerals after ASP flooding in ultra-high-water-cut-stage reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Response to the Variation of Clay Minerals During ASP Flooding in the Saertu Oilfield in the Songliao Basin

Liang

Wenfu

et al. 2021

Front. Earth Sci.

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In this paper, the variation of clay minerals and their influence on reservoir physical properties and residual oil before and after ASP flooding are analyzed. The results show that the total amount of clay minerals in reservoirs decreases after ASP flooding in the ultra-high-water-cut-stage reservoirs of the Naner Zone in the Saertu Oilfield, Songliao Basin. Therein, the illite content reduces, while the content of illite smectite mixed-layer and chlorite increases. The content of kaolinite varies greatly. The content of kaolinite decreases in some samples, while it increases in other samples. The clay minerals block the pore throat after ASP flooding. As a result, the pore structure coefficient and the seepage tortuosity increase, the primary intergranular pore throat shrinks, and the pore–throat coordination number decreases. Nevertheless, the dissolution of clay minerals reduces the pore–throat ratio and increases porosity and permeability. The variation of clay minerals after ASP flooding not only intensifies the reservoir heterogeneity but also affects the formation and distribution of residual oil. The residual oil of the oil–clay mixed adsorption state is a newly formed residual oil type related to clay, which accounts for 44.2% of the total residual oil reserves, so it is the main occurrence form of the oil in reservoirs after ASP flooding. Therefore, the exploitation of this type of residual oil has great significance to enhance the oil recovery in ultra-high-water-cut-stage reservoirs.

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Experimental research on remaining oil distribution and recovery performances after nano-micron polymer particles injection by direct visualization

Yue

Zhu

Huang

et al. 2018

Fuel

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Research on Microscopic Characteristics of Remaining Oil Distribution after Strong Alkali ASP Flooding by Laser Scanning Confocal Technology

Cited by 6 publications

References 2 publications

Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs

Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs

Response to the Variation of Clay Minerals During ASP Flooding in the Saertu Oilfield in the Songliao Basin

Experimental research on remaining oil distribution and recovery performances after nano-micron polymer particles injection by direct visualization

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