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稠油开采主要以注蒸汽热采为主,蒸汽沿井筒流动过程中,井筒散热损失和蒸汽温度、干度等均沿流程变化,对其进行精确计算和分析,对油田提高采收效果具有重要意义。本文对井筒结构和传热过程进行了分析,通过地面模拟实验,实测了隔热管的热损分布,并提出了热损合理分布概念。研究发现,接箍和隔热管外壁存在热桥,受影响的隔热管长度在0.5 m左右.同时,接箍处热流密度是正常隔热管的3倍以上,是需要研究的重点。按热损合理分布概念提出了三套改进设计方案,并对其进行了对比分析.
Heavy oil recovery is mainly steam injection thermal recovery, steam flow along the wellbore, wellbore heat loss and steam temperature, dryness and so on along the flow changes, accurate calculation and analysis of the oilfield to improve the recovery effect is important significance. In this paper, the wellbore structure and heat transfer process are analyzed. Through the ground simulation experiment, the heat loss distribution of the heat insulation pipe is measured, and the concept of heat loss distribution is proposed. It is found that there is a thermal bridge between the outer wall of the coupling and the heat-insulated pipe, and the length of the heat-insulated pipe is about 0.5 m. Meanwhile, the heat flux density at the coupling is more than 3 times that of the normal heat-insulated pipe. According to the concept of reasonable distribution of heat loss, three sets of improved design schemes are put forward and compared with each other.