塔河油田超深井井筒掺稀降粘技术研究

基于热量传递原理和两相流动理论,建立了井筒掺稀油降粘工艺中产液沿井筒流动与传热的热力学模型。计算了产液沿井筒的温度分布和压力分布,同时进行了不同掺稀条件下降粘的室内实验。运用该模型结合实验结果对塔河油田稠油井掺稀降粘效果进行了计算,分析了不同工艺参数对掺稀降粘效果的影响。结果表明,井筒掺稀油降粘工艺适合于含水率低于20%的油井,开式掺稀油反循环比开式掺稀油正循环生产更有利于提高降粘效果,塔河油田井筒掺稀降粘合理的掺稀比率为1:2至1:1。

Technology of blending diluting oil in ultra-deep wellbore of Tahe Oilfield

Oil is hard to flow in oil wells in Tahe Oilfield because of the ultra-deep reservoir，high oil viscosity and great heat loss in wellbore. The flow and heat transfer thermal-dynamic model for the fluid flowing along wellbore by using the blending diluting oil technology to reduce the viscosity was established 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 viscosity reduction experiments on Tahe heavy oil were carried out under different blending conditions. The effects of blending diluting oil condition in heavy oil wells were determined by using this model and combing the experiment results. The influences of the different producing parameters were analyzed.The results show that the blending diluting oil technology fits for the wells with water cut less than 20%. The open reverse circulation manner is more favorable for reducting viscosity than the open normal circulation manner. The reasonable blending ratio of diluting oil to crude oil is from 1∶2 to 1∶1 in Tahe Oilfield.