二氧化碳对稠油中沥青质分子聚集行为的影响研究
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中国石油大学华东

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国家重大科技专项“稠油化学复合冷采基础研究与工业示范”(项目编号 2018YFA0702400)


Effects of CO2 on the Aggregation Behaviorof Asphaltene Molecules in Heavy Oil
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China University of petroleum

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    摘要:

    沥青质的聚沉行为显著影响稠油的黏度,研究CO2对稠油中沥青质的聚集行为可以进一步解析CO2驱替过程中发挥作用的机理。在不同CO2压力及条件下,对稠油以及添加了苯和乙醇作为CO2增溶剂的稠油进行CO2溶解实验,分离四组分后得到了经CO2处理后的沥青质。运用X-射线衍射仪、扫描电子显微镜、透射电子显微镜等分析仪器对不同实验条件下提取的沥青质聚集体的层间距、表面形貌以及微观结构进行表征,分析了CO2对稠油中沥青质聚集行为的影响机理。结果表明,CO2在稠油中溶解导致沥青质聚集堆叠的层间距增大,减缓沥青质分子的聚集行为,从而起到降低稠油黏度的作用。

    Abstract:

    The aggregation behavior of asphaltenes significantly affects the viscosity of heavy oil. Studying the aggregation behavior of CO2 on asphaltenes in heavy oil can further analyze the mechanism of CO2 displacement. Under different CO2 pressures and conditions, CO2 dissolution experiments were carried out on heavy oil and heavy oil added with benzene and ethanol as CO2 solubilizers. After separating the four components, CO2-treated asphaltenes were obtained. X-ray diffractometer, scanning electron microscope, transmission electron microscope and other analytical instruments were used to characterize the interlayer spacing, surface morphology and microstructure of asphaltene aggregates extracted under different experimental conditions, and the effect of CO2 on asphaltenes in heavy oil was analyzed. Influence mechanism of aggregation behavior. The results show that the dissolution of CO2 in heavy oil leads to an increase in the interlayer spacing of asphaltene aggregation stacking, which slows down the aggregation behavior of asphaltene molecules, thereby reducing the viscosity of heavy oil.

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历史
  • 收稿日期: 2022-02-28
  • 最后修改日期: 2022-05-16
  • 录用日期: 2022-05-18
  • 在线发布日期: 2022-12-20
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