Quantitative analysis on distribution of microcosmic residual oil in reservoirs by frozen phase and nuclear magnetic resonance (NMR) technology

Xiong, Chao; Ding, Bin; Geng, Xindu; Guan, Bowen; Pan, Jingjun; Dong, Jingfeng; Huang, Bo; Yan, Youguo

doi:10.1016/j.petrol.2020.107256

Cited by 11 publications

(14 citation statements)

References 43 publications

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“…The last step was grinding the rock samples into thin slices to make the observation of the internal structures of the samples more convenient. 11 …”

Section: Experiments and Methodsmentioning

confidence: 99%

“… 8 Contrastively, the LSCM method can perform high-speed scanning and three-dimensional image reconstruction to reflect the 3D space of the samples; therefore, the microcosmic remaining oil can be divided into three categories containing 10 states by this method. 11 Hence, the LSCM method allows for the perception of finer details to analyze the law of microscopic remaining oil distribution characteristics than ordinary fluorescence.…”

Section: Experiments and Methodsmentioning

confidence: 99%

“…Second, these samples were air-dried at a lower temperature below 5 °C and cemented with glue. The last step was grinding the rock samples into thin slices to make the observation of the internal structures of the samples more convenient …”

Section: Experiments and Methodsmentioning

confidence: 99%

“…At present, micromechanics analysis, physical simulation experiment, fluorescence analysis, medical CT, NMR, and confocal laser scanning microscopy methods have been carried out to study the microscopic remaining oil distribution after waterflooding and polymer flooding. − Cheng has studied the remaining oil distribution in the horizontal and vertical directions with core membrane technology, showing that the behavior of remaining oil by polymer flooding is similar to that by water flooding . Shah has predicted the porosity and permeability of carbonate rocks from pore-to-core scale using medical CT, confocal laser scanning microscopy, and micro-CT, proving that micro-CT imaging cannot resolve the submicron resolution as compared to confocal imaging .…”

Section: Introductionmentioning

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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“…The last step was grinding the rock samples into thin slices to make the observation of the internal structures of the samples more convenient. 11 …”

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Experiments and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…e core advantages of the microfluidic visualization experiment are directly visible, highly efficient, less space occupied, and chip design flexible [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Research on Three-Phase Saturation Distribution Based on Microfluidic Visualization Experiment: A Case Study of Ling Xin Mining Area

Hu¹,

Huang²,

Song³

et al. 2022

Geofluids

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Flow characteristics and phase distribution of concentrated brine storage in mining area have been core factors linking to the leakage risk assessment and ecological evaluation. Notably, saturation plays a crucial role in impacting the flow characteristics and distribution of brine, while the existence of oil left by mining machines and original reservoir and gas produced from coal bed gas and air has complicated the issue. In this work, we conducted the microfluidic visualization experiments to reveal the saturation distribution during brine storage in mining area. We applied machine learning model to extract saturation data from experimental images with over 95% accuracy. Eventually, we found that the existence of gas significantly impacts on the saturation distribution in micropores accounting for more than 80% contribution. We clarified that the gas production rate of median 200 μL/min impacts the least on saturation variation. Results in this research are of significance for deeper comprehension on three-phase saturation characteristics of concentrated brine storage in mining area.

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Novel chemical flood combination of CSA particles and strong emulsifying surfactant in heterogeneous reservoirs

Yue

et al. 2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Quantitative analysis on distribution of microcosmic residual oil in reservoirs by frozen phase and nuclear magnetic resonance (NMR) technology

Cited by 11 publications

References 43 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

Research on Three-Phase Saturation Distribution Based on Microfluidic Visualization Experiment: A Case Study of Ling Xin Mining Area

Novel chemical flood combination of CSA particles and strong emulsifying surfactant in heterogeneous reservoirs

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