乳化稠油电加热井筒举升边界条件研究

Research on Boundary Condition of the Wellbore Electric Heating Lifting the Emulsified Heavy Oil

井筒电加热降黏技术在国内的各大油田应用非常广泛,随着胜利油田现河采油厂特超稠油井的开发,井筒电加热配套井数也逐渐增多,为解决采油厂井筒电加热配套井数增多,造成能耗过大的问题,以胜利油田现河采油厂稠油为研究对象,开展稠油乳状液黏度-温度-含水变化规律研究,总结出了现河采油厂稠油的黏温特性以及拐点温度、含水分布等规律。以拐点温度作为临界温度,确定乳化稠油电加热井筒举升的黏度边界为110 000mPa·s,低于此黏度的稠油乳状液无需开启电加热就能顺利从井筒举升到地面。最终根据黏度边界制定出乳化稠油井筒举升优化图版,以指导稠油高效节能开采。

The technology of wellbore electric heating was widely used in major domestic oilfields.With the development of the super-heavy oil in Xianhe oil production plant of Shengli oilfield,the number of wells matching the wellbore electric heating was increased.In order to solve the problem of the increasing number of wells matching the wellbore electric heating and excessive energy consumption,the heavy oil of Xianhe oil production plant had been studied as the research object to carry out the heavy oil emulsion viscosity-temperature-water variation research.The regular pattern of viscosity-temperature characteristics,the inflection point temperature and moisture distribution were summarized through deep analysis.The inflection point was used as the critical temperature to determine the viscosity boundary of emulsified heavy oil lifted by the wellbore electric heating.The viscosity boundary was 110 000 mPa·s.If the viscosity of emulsified heavy oil was less than110 000mPa·s,the heavy oil could be lifted from the wellbore to the ground smoothly without opening the electrical heating.Finally according to the viscosity boundary,the emulsified heavy oil shaft lifting optimization chart could be made to guide the high efficiency and energy saving of heavy oil exploitation.