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

[Image: see text] 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-lase...

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Autores principales: Ping, Xiaolin, Han, Guoqing, Bai, Zhenqiang, Wang, Qinghua, Peng, Long
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9366948/
https://www.ncbi.nlm.nih.gov/pubmed/35967062
http://dx.doi.org/10.1021/acsomega.2c01906
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author Ping, Xiaolin
Han, Guoqing
Bai, Zhenqiang
Wang, Qinghua
Peng, Long
author_facet Ping, Xiaolin
Han, Guoqing
Bai, Zhenqiang
Wang, Qinghua
Peng, Long
author_sort Ping, Xiaolin
collection PubMed
description [Image: see text] 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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spelling pubmed-93669482022-08-12 Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs Ping, Xiaolin Han, Guoqing Bai, Zhenqiang Wang, Qinghua Peng, Long ACS Omega [Image: see text] 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. American Chemical Society 2022-07-26 /pmc/articles/PMC9366948/ /pubmed/35967062 http://dx.doi.org/10.1021/acsomega.2c01906 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Ping, Xiaolin
Han, Guoqing
Bai, Zhenqiang
Wang, Qinghua
Peng, Long
Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs
title Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs
title_full Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs
title_fullStr Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs
title_full_unstemmed Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs
title_short Study on Microscopic Distribution Characteristics of the Remaining Oil in Polymer-Flooded Reservoirs
title_sort study on microscopic distribution characteristics of the remaining oil in polymer-flooded reservoirs
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9366948/
https://www.ncbi.nlm.nih.gov/pubmed/35967062
http://dx.doi.org/10.1021/acsomega.2c01906
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