垦利油田高黏原油掺稀黏度变化规律

Variation of dilute viscosity of high viscosity crude oil in Kenli Oilfield

为了研究垦利油田高黏原油掺混稀油后黏度变化规律以满足依托式高效开发的要求,以垦利油田高黏原油为基础掺混周围3个油田的稀油原油,利用13种可能适合的掺混黏度预测模型进行预测,并将预测结果与实验值相比较、分析,认为各修正模型主要考虑了组分油之间的相互关系,使得其预测精度较原始模型高。各模型对垦利油田A高黏原油与3种稀油掺混后的黏度预测效果普遍随温度的降低而恶化,在较高温度下预测精度相对较高。Cragoe修正模型和Arrhenius修正2模型对目标油品的掺混均有较高的预测精度,能满足工程实际的需要。综合考虑预测精度和预测稳定性,推荐Arrhenius修正2模型作为垦利油田稠油A与周边稀油掺混后黏度的预测模型。

In order to study the change of viscosity of high viscous crude oil mixed with dilute oil in Kenli Oilfield to meet the requirements of relying high efficiency development,three kinds of normal crude extracted from nearby oilfields are mixed with Kenli viscous crude respectively and are tested in laboratory.The results are compared with the prediction results by the thirteen existing viscosity prediction models,indicating that the various modified models have better prediction effect than the original models as they are taking the interaction between component crude into account.The prediction accuracy by models is worse with the temperature decreases.To the specified viscous crude-solvent mixtures,the modified Cragoe correlation and modified ArrheniusⅡhave high prediction accuracy than other models,and the calculated result by the two correlations can be used in the engineering field.When taking a comprehensive analysis on prediction accuracy and prediction stability,the model of modified ArrheniusⅡis recommended for viscosity calculation of Kenli viscous crude-solvent mixtures.