A dielectric investigation of structural-phase transitions in oils

Oil and Gas Studies Pub Date : 2023-01-11 DOI:10.31660/0445-0108-2022-6-110-125

M. G. Sheveleva, L. V. Taranova, S. G. Agaev

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Abstract

The article deals with issues related to the mechanism of solidification of oils. The authors present the results of a dielectric investigation of structural-phase transitions in oils from the fields of Tyumen region in the temperature range -110 ÷ +20 °С. The dielectric relaxation of oils has been established, the values of the activation energy and dielectric relaxation time have been calculated. The phase transition determined by dielectric relaxation is interpreted as a transition from the glassy state to the associated state. The glass transition of oils, accompanied by the cessation of internal rotation in hydrocarbon molecules, is a sign of their true (or viscous) solidification. The glass transition temperature and the temperature region of the structural solidification of oils were determined. The glass transition temperature is considered to be the true pour point. The relationships between the physicochemical characteristics of oils and the parameters characterizing their dielectric properties were established, which were studied by the methods of correlation and regression analysis. The obtained regression equations can be used to predict the physico-chemical characteristics of oils in the technological processes of their extraction, field preparation and transportation.

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油中结构相变的介电介质研究

本文讨论了油类凝固机理的有关问题。本文介绍了秋明地区油田-110°~ +20°С温度范围内石油结构相变的介电研究结果。建立了油类的介电弛豫方程，计算了油类的活化能和介电弛豫时间。由介电弛豫决定的相变被解释为从玻璃态到伴生态的转变。油的玻璃化转变伴随着碳氢化合物分子内部旋转的停止，是它们真正(或粘性)凝固的标志。确定了油的玻璃化转变温度和结构凝固温度区域。玻璃化转变温度被认为是真正的倾点。建立了油品的理化特性与其介电性能参数之间的关系，并用相关分析和回归分析的方法对其进行了研究。所得的回归方程可用于预测油品在提取、现场制备和运输等工艺过程中的物理化学特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Oil and Gas Studies

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