塔河油田超深自喷井流态特征分析

针对塔河油田油藏埋藏深、原油粘度高、井筒热损失大导致自喷困难的实际问题，根据热量传热原理和两相流动理论，建立了自喷井中产出液沿井筒流动与传热的热力学模型。运用该模型计算了塔河油田5口稠油井产出液沿井筒的温度和压力分布。计算结果表明。随着产出液沿井筒的举升。压力逐渐减小，温度不断下降。当温度下降到一定数值时。原油粘度明显增大，即对应原油的拐点温度出现。因此，可以根据流态特征来估计该原油的拐点温度，为选择合适的降粘方法和降粘深度提供了技术指导。

Flow pattern character analysis on ultra - deep flowing well in Tahe Oilfield

Aiming at the problem of being hard to natural flow because of the deep buried depth,high viscosity of the crude oil and more wellbore heat losses in Tahe Oilfield,the flow and heat transfer thermodynamic model of the produced fluid flowing along the wellbore in flowing wells are established on the basis of heat transfer principle and two phase flow theory. The temperature and pressure distribution of the fluid flowing along the wellbore of 5 crude oil wells in Tahe Oilfield are calculated with the model. The results show that the pressure and the temperature decreases gradually along with the wellbore lift of the produced fluid. Flex point temperature can be confirmed where the crude oil viscosity increases obviously and the temperature decreases at certain value. So flow pattern character can be used to estimate the flex point temperature of the crude oil, which will help for selecting the available viscosity reducing method and the viscosity reduction depth.