Impact of Oil Composition on Microwave Heating Behavior of Heavy Oils
Impact of Oil Composition on Microwave Heating Behavior of Heavy Oils
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DOI：
10.1021/acs.energyfuels.7b03675
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发表时间：
2018-02-01
期刊：
影响因子：
5.3
通讯作者：
Robinson, John P.
中科院分区：
文献类型：
--
作者：
Zhang, Yang;Adam, Mohamed;Robinson, John P.
电磁加热技术作为传统加热方法的替代品，最近受到了极大的关注，用于粘性和重油的热处理。电磁加热的好处之一是电磁场可以穿透粘性油和岩石基质，允许加热发生在距离电磁源很远的地方。电磁加热在克服粘性油内的热传递限制方面存在机会，并且可能作为井下或原位加热技术来提高储层内的温度。电磁能与粘性和重油及其组成成分的基本相互作用知之甚少，本研究通过建立温度对重油及其SARA馏分介电性质的影响，增强了对微波频率下这些相互作用的理解。在高达300摄氏度的温度和900 MHz至3.0 GHz的频率下研究了两种重油的介电性能。发现两种油的损耗因子随温度显著增加，这与粘度的相应降低有关。它是第一次，在文献中以前的断言相反，芳香族化合物和树脂是对重油介电损耗的主要贡献者，而饱和烃和沥青质被发现有一个可以忽略不计的影响的油的损耗因子。因此，可以看出，在较高的温度下或在存在高丰度的芳族化合物和树脂的情况下，油更易于直接用微波加热，从而为在炼油厂和油田环境中微波处理油而不需要微波吸收添加剂开辟了新的机会。
Electromagnetic heating techniques have recently received significant attention as alternatives to conventional heating methods for thermal processing of viscous and heavy oils. One of the benefits of electromagnetic heating is that the electromagnetic field can penetrate the viscous oil and the rock matrix, allowing heating to take place a significant distance from the electromagnetic source. Opportunities exist for electromagnetic heating in overcoming the heat-transfer limitations within viscous oils and potentially as a down-hole or in situ heating technique to raise the temperature within a reservoir. The fundamental interaction of electromagnetic energy with viscous and heavy oils and their constituent components is poorly understood, and this study enhances the understanding of these interactions at microwave frequencies by establishing the effect of temperature on the dielectric properties of heavy oil and its SARA fractions. The dielectric properties of two heavy oils were studied at temperatures up to 300 degrees C and frequencies from 900 MHz to 3.0 GHz. The loss factor of both oils was found to increase significantly with temperature, which was linked to a corresponding reduction in viscosity. It is shown for the first time, contrary to previous assertions in the literature, that aromatics and resins are the main contributors toward dielectric loss in heavy oils, whereas saturates and asphaltenes were found to have a negligible influence on the loss factor of the oil. Thus, it will be seen that, at higher temperatures or where there is a high abundance of aromatics and resins, the oils are more susceptible to being heated directly with microwaves, opening up new opportunities for microwave processing of oils in refinery and field settings without the need for microwave-absorbing additives.