昌吉油田冷采稠油回掺热水集输特性

Gathering transportation characteristics of the reinjection of hot water for the heavy oil cold production in Changji Oilfield

为适应注水冷采稠油地面集输要求,昌吉油田下设吉7井区采用了回掺热水集输工艺。随着产能建设规模的不断扩大,吉7井区出现了油井掺水温度和压力较低、掺水量过大等问题。通过统计现场相关生产数据,分析了油井掺水量的主要影响因素,计算了回掺热水集输过程中的热力损失,并进行了部分油井的停掺热水试验。结果表明:油井回掺水量主要受油井集输管长影响;掺水集输管道的保温效果较差,热力损失较为严重;在停掺热水集输过程中,井口采出液存在较明显的段塞流,极易造成油井采出液集输困难。研究成果可为昌吉油田冷采稠油的现场管理和工艺优化提供理论指导。(图7,表1,参20)

In order to adapt to the surface gathering requirement of heavy oil cold production, the gathering process based on the reinjection of hot water is adopted in Wellblock Ji-7 of Changji Oilfield. With the continuous expansion of the productivity construction scale, a series of problems occur in Wellblock Ji-7. For example, the temperature and pressure of the blending hot water in the oil wells are lower, and the quantity of the blending hot water is too large. In this paper, the relevant field production data was statistically analyzed. Then, the major factors influencing the quantity of blending hot water were analyzed, and the heat loss in the gathering process of blending hot water was calculated. Finally, the experiment on stopping the reinjection of hot water was carried out in some oil wells. It is shown that the quantity of the blending hot water of oil well is mainly affected by the length of gathering pipeline. The gathering pipeline of blending hot water is poorer in heat preservation effect and its heat loss is more serious. In the process of stopping the reinjection of hot water,there is obvious slug flow in the wellhead produced fluid, which tends to make oil gathering and transportation difficult.The research results can provide theoretical guidance for field management and optimization of heavy oil cold production in Changji Oilfield.