塔河油田自喷深井井筒电加热降粘技术研究

Research on viscosity reduction by electric heating technology in ultra-deep flowing well in Tahe Oilfield

为了解决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问题,基于热量传递原理和两相流动理论,建立了井筒电加热降粘举升工艺中产液沿井筒流动与传热的数学模型,计算了产液沿井筒的温度和压力分布,分析了电加热工艺参数对电加热效果的影响。运用该模型对塔河油田1口稠油井的电加热降粘效果进行了分析,界定了电加热井筒降粘工艺对原油粘度的适应性。结果表明,电加热工艺适用的最大原油粘度为30 Pa.s,这一结果为电加热降粘工艺的应用提供了依据。

In order to solve the problem that the fluid flowing is hard because of the ultra-deep reservoir, high oil viscosity and great wellbore heat loss in Tahe Oilfield, the flow and heat transfer models of the fluid flowing along the wellbore were established using electric heating to reduce the viscosity on the basis of heat transfer principle and two-phase flow theory. The temperature and pressure sections of the fluid flowing along the wellbore were calculated. The influences of the different producing parameters on the electric heating effect were analyzed. The viscosity reduction effect of a heavy oil well was analyzed using the electric heating technology by this model, and the oil viscosity adaptability of the electric heating technology was confirmed in Tahe Oilfield. The results show that the maximum oil viscosity is 30 Pa＇s using the electric heating technology, which will be helpful to the application of the technology.