Long-Time Kinetic Impact on Key Factors Affecting Asphaltene Precipitation
Long-Time Kinetic Impact on Key Factors Affecting Asphaltene Precipitation
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DOI：
10.1021/acs.energyfuels.2c01963
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发表时间：
2022-08
期刊：
影响因子：
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通讯作者：
A. K. Quainoo;Abdulmohsin Imqam
中科院分区：
文献类型：
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作者：
A. K. Quainoo;Abdulmohsin Imqam
采用动力学和热力学分析相结合的预测技术是有效控制原油开采过程中沥青质沉淀的简洁解决方案。虽然热力学过程和条件已经在文献中得到了很好的研究，长时间动力学的影响的关键因素影响的沥青质沉淀的效果没有严格的研究。这项工作采用了一种模型油的沥青质沉淀的长期动力学观察。使用0-7200分钟时间段的过滤和共聚焦显微镜实验来研究在室温和高温（25、50和70 °C）、旋转速度（60和150 rpm）和沉淀剂浓度（50和60 wt %）下的沥青质产率和尺寸。用DLVO模型对两个实验的结果进行了拟合。实验结果表明，温度、转速和沉淀剂组成对沥青质沉淀的影响受时间的影响显著。当庚烷浓度从50wt%增加到60wt%时，7200 min内沥青质产率从27%增加到83%。相反，当观察较长时间（0-7200 min）时，将温度从25 ℃升高至70 ℃会使累积沥青质产率降低20-40%。通过共聚焦实验观察到，在研究的时间范围内，随着温度的升高，沉淀沥青质的平均当量直径（MED）显着减少。转速与沥青质产率和粒径呈负相关。当系统的转速从60 rpm增加到150 rpm时，观察到产率从30%降低到50%。这项工作的结果证实了接触时间对沥青质沉淀的显著影响。此外，DLVO理论用于预测从共焦显微镜获得的实验数据拟合的数据的平均绝对误差范围为4.44至5.15，这表明显着的限制后，增加温度。这一发展是朝着提高没有沥青质相关问题的生产路线的可预测性的方向取得的进展。
The employment of predictive techniques combining kinetic and thermodynamic analyses is the succinct solution to effectively control asphaltene precipitation during crude oil production. Although thermodynamic processes and conditions have been well studied in the literature, the effect of long-time kinetics on the key factors affecting the precipitation of asphaltenes was not critically studied. This work employed a model oil for asphaltene precipitation long-time kinetic observations. Filtration and confocal microscopy experimentations for time periods of 0–7200 min were utilized to study asphaltene yields and sizes at room and high temperatures (25, 50, and 70 °C), rotation speeds (60 and 150 rpm), and precipitant concentrations (50 and 60 wt %). The results from both experiments were fitted with DLVO models. The experimental results confirmed that the effects of temperature, rotation speeds, and precipitant compositions on asphaltene precipitation were significantly affected by time. The asphaltene yields increased from 27 to 83% within 7200 min when the heptane concentration increased from 50 to 60 wt %. Conversely, increasing temperatures from 25 to 70 °C reduced the cumulative asphaltene yields by 20–40% when observed for a long time (0–7200 min). Significant reductions in the mean equivalent diameter (MED) of precipitating asphaltenes upon increasing temperature within the studied timeframes were observed via the confocal experimentations. The rotation speeds also showed an inverse relationship with asphaltene yields and particle size. A reduction from 30 to 50% of the yield was observed as the rotation speeds of the system were increased from 60 and 150 rpm. The results of this work confirmed the significant impact of contact time on the precipitation of asphaltenes. In addition, DLVO theory employed to predict the experimental data obtained from the confocal microscopy fitted the data with mean absolute errors ranging from 4.44 to 5.15, which showed significant limitations upon increasing temperature. This development is progress toward enhancing the predictability of a production route devoid of asphaltene-related problems.