稠油热采井井筒温度模型研究及应用

Wellbore Temperature Model Study and Application in Heavy Oil Thermal Recovery Well

在稠油开采过程中,准确地预测井筒温度是选择合适的采油工艺,防止稠油结蜡增黏的基础。采用对流-扩散模型计算油管与抽油杆之间的环空内的流体传热,建立了稠油井井筒加热温度场的二维非稳态数学模型;并使用控制容积法实现模型的数值求解,模拟结果和现场实测井筒温度吻合度较好。通过模型计算,分析了电加热生产和热流体循环加热过程中影响井筒温度的诸多因素。结果表明加热流体的入口温度和流量对井筒温度场影响最明显、热流体的掺入深度存在最优范围、空心杆循环热流体的加热方法优于套管掺液,对提高稠油油井采油效率具有指导意义。

Exactly predicting wellbore temperature can guide choosing appropriate oil production technology in heavy oil production process,prevent oil wax and tackification.Using convection-diffusion model calculate annulus fluid heat transfer between tubing and rod,two-dimensional unsteady wellbore temperature distribution mathematical model is established.And the model realizes numerical solution through control volume method.The calculation resuits and the measured wellbore temperature coincide satisfactorily.Through analysis the influencing factors of wellbore temperature,the results show that the entrance temperature and flow rate has the most obvious influence on the wellbore temperature field,there exists an optimum range of hot fluid incorporation deep and the hollow rod cyclic heating method is better than that of casing.It is of guiding significance to improve the efficiency of oil production in heavy oil wells.