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Abstract <p>The paper describes the structural and rheological investigation of two thermally pretreated highly paraffinic resinous crude oils, specifically the oils from the South-Maiskoye oil field (SM) and from the Archinskoye oil and gas condensate field (AR). Pretreating SM (asphaltene/resin ratio ≈ 0.09) at 40°C induced an anomalous rise in both viscosity–temperature behavior and asphalt–resin–paraffin deposit (ARPD) formation—in contrast to pretreatment of the same oil at 10, 20, and 60°C. For AR (with its asphaltene/resin ratio of about 0.23), elevating the pretreatment temperature to 60°C decreased the viscosity and pour point and increased the concentrations of resinous-asphaltenic components and solid <i>n</i>-alkanes in the ARPDs. Photon correlation spectroscopy revealed a spontaneous growth of aggregates when the SM oil was cooled from 35 to 25°C. Cooling the AR oil from 50 to 35°C generated large and small aggregates simultaneously.</p>

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Structural and Rheological Behaviors and Aggregation of Thermally Pretreated Highly Paraffinic Crude Oils

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Yu. V. Loskutova,
  • L. V. Chekantseva,
  • N. V. Yudina

摘要

Abstract

The paper describes the structural and rheological investigation of two thermally pretreated highly paraffinic resinous crude oils, specifically the oils from the South-Maiskoye oil field (SM) and from the Archinskoye oil and gas condensate field (AR). Pretreating SM (asphaltene/resin ratio ≈ 0.09) at 40°C induced an anomalous rise in both viscosity–temperature behavior and asphalt–resin–paraffin deposit (ARPD) formation—in contrast to pretreatment of the same oil at 10, 20, and 60°C. For AR (with its asphaltene/resin ratio of about 0.23), elevating the pretreatment temperature to 60°C decreased the viscosity and pour point and increased the concentrations of resinous-asphaltenic components and solid n-alkanes in the ARPDs. Photon correlation spectroscopy revealed a spontaneous growth of aggregates when the SM oil was cooled from 35 to 25°C. Cooling the AR oil from 50 to 35°C generated large and small aggregates simultaneously.