Laboratory Investigation of Compatibility Between Sugarcane Seepage Water and Crude Oil: A Case Study of South-west Fields of Iran

Document Type : Research Paper

Authors

1 Faculty of Chemical, Oil and Gas Engineering, Shiraz University, Shiraz, Iran

2 National Iranian South Oil Company, Ahwaz, Iran

10.22078/pr.2024.5318.3366

Abstract

The water injection process is a common method for enhancing oil recovery from reservoirs. However, challenges arise, primarily due to the incompatibility of injected water with both oil and reservoir water. On the other hand, due to the limited availability of fresh water resources worldwide, the use of unconventional water sources is being considered. Among these sources, agricultural drainage water, particularly sugarcane irrigation water, is a significant source. In this study, the compatibility of two samples of sugarcane irrigation water with three samples of oil from southwest Iranian fields was investigated in terms of emulsion formation and organic matter deposition. Additionally, the compatibility of sugarcane irrigation water and a produced water sample was monitored in terms of mineral deposition through laboratory experiments. Furthermore, the results indicate that emulsion formation and phase separation occurred in the emulsion of sugarcane water sample 1 and oil A during the three-hour test period, with a 63% phase separation. However, a stable emulsion without phase separation was observed in the emulsion of sugarcane water sample 2. Similar experiments were conducted with oils B and C, and for both sugarcane irrigation water samples, the phase separation increased from 37% in the initial hours to 82% after three hours. Furthermore, the tendency for emulsion formation changes significantly with variations in the water-oil mixing ratio. On the other hand, no organic deposition resulting from the incompatibility of water and crude oil samples was observed. Overall, sugarcane irrigation water can be a suitable option for injection in some oil fields, but it is important to assess compatibility prior to field implementation. Moreover, no significant deposition was observed when both sugarcane water samples were mixed with the produced water, indicating the possibility of mixing water from different sources for injection. Furthermore, to evaluate the possibility of various depositions due to the injection of sugarcane water into the reservoir, simulation was performed using OLI scale chem software, and the probability of CaCO3, CaSO4, and Fe2CO3 deposition was determined.

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References

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Journal of Petroleum Research
Volume 34, 1403-2 - Serial Number 135
Special Issues on Water-based EOR
July and August 2024
Pages 17-35

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