Modification of the Bouguer-Lambert-Baer law for high-viscosity oil IR-analysis

THE RELEVANCE of the research lies in the development of methods for analyzing high-viscosity oil, whose share in world reserves and production is continuously growing. Accurate rapid analysis of the composition of such oil is necessary to optimize its production, transportation, and selection of chemical additives that increase mobility. However, application of the classical Bouguer-Lambert-Baer (BLB) law is difficult due to strong scattering of radiation and nonlinearity of optical response caused by complex multicomponent structure of high viscosity oil. THE PURPOSE is to develop a modified model of BLB law that takes into account rheological properties, and light scattering by asphaltene-resinous aggregates, and propose new model linking effective absorption coefficient to structural parameters of oil. METHODS. To substantiate the effectiveness of ultrasonic treatment as a method for sample preparation to improve the linearity of an oil medium, we used theoretical modeling and mechanisms for ultrasonic processing and its effects on optical properties. RESULTS. We show that consideration of rheological properties and light scattering is essential for an adequate description of the transmission of infrared (IR) radiation through viscous oil. The proposed modification to the BLB law incorporates additional terms to account for optical density due to particle scattering. Ultrasonic treatment reduces viscosity and heterogeneity, improving the transmission of IR radiation, which justifies its effectiveness. CONCLUSION. Integrating rheological factors into the BLB model and using ultrasonic preparation improves the accuracy of IR analysis of viscous oils. This will make it possible to more reliably determine the functional composition of high-viscosity oils in order to solve problems of increasing oil recovery, optimizing processes, and pipeline transport safety. Ultrasonic treatment provides a non-reactive reduction in viscosity and scattering, making it a promising method for sample preparation for rapid analysis.

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