关键词: 塔河油田, 井筒, 超深井, 掺稀油降粘工艺, 计算模型

Abstract: 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.

Key words: Tahe Oilfield, wellbore, ultra-deep well, blending diluting oil technology, calculation model