Forecasting the composition and properties of asphaltene-resin-paraffin deposits based on experimental studies

The article presents a comparative analysis of the results of gas chromatography studies of the component composition of Devonian oil and asphaltene–resin–paraffin deposits (ARPD). The component composition of normal and iso-alkanes in the range from C10 to C40 was performed using a Shimadzu GC 2010 Plus chromatograph. It was established that ARPD are predominantly composed of high-molecular-weight n-alkanes C26–C40, which concentration is 5–6 times higher than their content in oil. To quantify the selectivity of hydrocarbon transfer into the solid phase, the solid-phase transition index (SPTI) was introduced, calculated as the ratio of a component's concentration in ARPD to its concentration in oil. Analysis of SPTI values showed that the critical accumulation threshold is typical for alkanes C27 and above, with maxima for ceresins C37–C39. The higher heterogeneity of ARPD composition compared to oil composition confirms the significant influence of individual geological and technical well conditions on the deposit formation process. Correlations between the component composition of ARPD, the melting point of deposits, and their structural-mechanical properties were established. The results reveal the potential of using chromatographic oil studies to predict the composition and properties of ARPD and to develop a methodology for the targeted selection of technologies and chemical reagents for their removal.

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