井筒中垂直泡状流传热实验研究

Experimental research of the heat transfer of the vertical bubbly flow in wellbore

通过理论实验相结合的方法研究石油钻采过程中井筒内泡状流传热问题.根据井筒内泡状流流动特点,以传热学基本理论为基础,建立考虑泡状流流动参数分布的泡状流传热模型,并在模拟井筒多相流传热实验装置上进行了泡状流传热实验,对所建立的传热模型进行评价,研究传热规律.结果表明:建立的泡状流传热模型计算精度良好;泡状流对流换热系数随液体流量增大线性增加,随平均空隙率增大线性减小,液体流量是影响泡状流对流换热系数的主要因素.研究两相流传热要考虑流型自身的流动特点.

In order to study the heat transfer problem of bubbly flow in wellbore in oil development process,the steady heat transfer model was established based on the theory of heat transfer,in which the distribution of the flow parameters of the bubbly flow is considered.The simulation experiment equipment of the vertical bubbly flow in wellbore was made for the verification of the established heat transfer model and the research of the heat transfer law of the vertical bubbly flow.The experimental results show that,the established model is close to the real flow,the convective heat transfer coefficient of the bubbly flow increases linearly with the increase of liquid flow rate and decreases linearly with the increase of the average void fraction of the bubbly flow.The flow rate of liquid is the main factor of influencing the convective heat transfer coefficient.So the characteristic of each flow pattern must be considered when studying multiphase heat transfer.