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应用RUSKA落球式高压粘度测试装置 ,测定了某油藏原油在油藏温度下粘度随压力的变化 ,着重研究了CO2 注入量对该油样的减粘效果。实验结果表明 ,注CO2 对该油样的减粘效果明显 ,当注入的CO2 与原始油样的摩尔比为 0 33时 ,粘度为原始油样的 6 0 9%。但CO2 注入量继续增加油样粘度下降的幅度变缓 ,当CO2 注入量与原始油样的摩尔比为 2 0 0时 ,油样粘度为原始油样的 40 9%。用PR粘度模型对含CO2 明确组分体系和注CO2 油气藏流体体系的粘度进行了预测计算 ,对CO2 nC10 H2 2 二元体系 ,PR粘度模型的总均误差为 7 2 % ,对注CO2 油气藏体系 ,PR粘度模型的总均误差为 12 5 9%。结果表明 ,PR粘度模型可用于预测注CO2 油藏体系的粘度 ,计算精度显著优于石油工程中常用的其他粘度模型
Using RUSKA falling ball high pressure viscosity testing device, the viscosity of a crude oil in a reservoir was measured under pressure. The viscous effect of CO2 injection on the oil sample was studied. The experimental results show that CO2 injection has obvious viscosity reducing effect on this oil sample. When the molar ratio of CO2 injected to the original oil sample is 0 33, the viscosity is 60.9% of the original oil sample. However, the CO2 injection rate continued to increase. The viscosity of the oil sample decreased slowly. When the molar ratio of CO2 injection amount to the original oil sample was 200, the viscosity of the oil sample was 40.9% of the original oil sample. The viscosity of CO2 fluid system with CO2 explicit component system and CO2 injection reservoir was predicted by PR viscosity model. The total error of PR viscosity model for CO2 nC10 H2 2 binary system was 72% In the reservoir system, the total error of the PR viscosity model is 125.9%. The results show that the PR viscosity model can be used to predict the viscosity of CO2 injection reservoir system, the calculation accuracy is significantly better than other viscosity models commonly used in petroleum engineering