CALCULATION OF FLUID TEMPERATURE DISTRIBUTION IN WELLBORE WITH HEAVY OIL PUMP

According to the theory of heat exchange and energy balance, an array of ordinary differential equation for calculating the fluid temperature distribution in the wellbore with heavy oil pump is established in consideration of the heat exchange between the produced fluid in the annular space and the the injected fluid from pipeline,as well as the Joule Tomphson effect caused by the phase change of liquid. The relationship of temperature distribution to production time is discussed. On the basis of the mathematical model, a computer program is designed. The calculation result shows that the program can be used to calculate conveniently the temperature distribution of mixed or produced liquid in any depth of wellbore at any time. The analysis on an application case demonstrates that the model and the calculation result are reasonable. The producing time and Joule Tomphson effect have the important effects on the fluid temperature distribuiotn in wellbore.