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Energies 2019, 12(3), 562; https://doi.org/10.3390/en12030562

Experimental Study on the Physical Performance and Flow Behavior of Decorated Polyacrylamide for Enhanced Oil Recovery

1
EOR key lab in the Ministry of Education in Northeast Petroleum University, Daqing 163318, China
2
Daqing Oilfield Co., Ltd. No. 6 Oil Production Company, Daqing 163318, China
*
Authors to whom correspondence should be addressed.
Received: 21 January 2019 / Revised: 10 February 2019 / Accepted: 11 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Sustainability of Fossil Fuels)
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Abstract

With the rapid growth of energy consumption, enhanced oil recovery (EOR) methods are continually emerging, the most effective and widely used was polymer flooding. However, the shortcomings were gradually exposed. A novel decorated polyacrylamide might be a better alternative than polymer. In this work, the molecular structure and the properties reflecting the viscosity of decorated polyacrylamide, interfacial tension, and emulsification were examined. In order to better understand the interactions between decorated polyacrylamide and oil as well as the displacement mechanism, the displacement experiment were conducted in the etched-glass microscale model. Moreover, the coreflooding comparison experiments between decorated polyacrylamide and polymer were performed to investigate the displacement effect. The statistical analysis showed that the decorated polyacrylamide has excellent characteristics of salt tolerance, viscosity stability, and viscosification like polymer. Besides, the ability to reduce the interfacial tension in order 10−1 and emulsification, which were more similar to surfactant. Therefore, the decorated polyacrylamide was a multifunctional polymer. The displacement process captured by camera illustrated that the decorated polyacrylamide flooded oil mainly by means of ‘pull and drag’, ‘entrainment’, and ‘bridging’, based on the mechanism of viscosifying, emulsifying, and viscoelasticity. The results of the coreflooding experiment indicated that the recovery of decorated polyacrylamide can be improved by approximately 11–16% after water flooding when the concentration was more than 800 mg/L, which was higher than that of conventional polymer flooding. It should be mentioned that a new injection mode of ‘concentration reduction multi-slug’ was first proposed, and it obtained an exciting result of increasing oil production and decreasing water-cut, the effect of conformance control was more significant. View Full-Text
Keywords: decorated polyacrylamide; physical properties; displacement mechanism; flow behavior; enhanced recovery; injection mode decorated polyacrylamide; physical properties; displacement mechanism; flow behavior; enhanced recovery; injection mode
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liang, S.; Liu, Y.; Hu, S.; Shen, A.; Yu, Q.; Yan, H.; Bai, M. Experimental Study on the Physical Performance and Flow Behavior of Decorated Polyacrylamide for Enhanced Oil Recovery. Energies 2019, 12, 562.

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