高凝高粘原油井筒粘度计算模型

大港油田高凝高粘原油在不同含水、不同温度下的粘度测试结果表明,在不同含水条件下,随温度的升高,高凝高粘原油的粘度都有不同程度的降低,表现出了很明显的粘温特性;在同一温度下,原油的粘度随着含水率的变化是一个先增加后减小的过程,峰值含水区间为20%～40%;对实测原油粘度数据进行回归得到粘度计算经验模型。根据幂律流体流动规律分别建立了有杆抽油井上冲程和下冲程过程中井筒和杆管环形管道内流体流动的速度场模型和相对应的流体粘度计算模型。计算结果显示,所建立的井筒粘度计算模型与实测结果误差较小,大大优于常规油井井筒粘度计算模型,能够满足工程需要。

Computational Model for Fluid Viscosity in Wellbore of High-Freezing-Point and High-Viscosity Oil Reservoirs

The viscosity measurement result of high freezing point and high viscosity crude oil under different water content and temperature indicates that the viscosity reduces with the increase of temperature under same water content.Under the same temperature,the viscosity of high freezing point and high viscosity crude oil increase and then decrease,the maximum occurs in the range of 20% to 40% of water concentration.An empirical model was obtained by regressing experimental data.Velocity and viscosity models in well bore and the annular space between pumping rod and oil pumping were established during the upstroke and downstroke according to the flow law for power law fluid.The calculated results agree with experimental data and are batter than conventional model.This model meets the requirement of field application.