Wellbore temperature distribution during cyclic hot fluid heating in heavy oil thermal recovery
Aiming at the situation of cyclic heating of wellbore-produced fluid by closed hot fluid,a two-dimensional transient temperature distribution model of the cyclic hot fluid and the produced fluid was established,considering the effects of convective heat transfer,axial heat transfer and heat source on heating of produced fluid by hot fluid.The finite volume method was used to solve the model,and influence rules of hot fluid inlet temperature,hot fluid flow rate,heating depth of hot fluid and produced fluid quantity on produced fluid temperature and the effect degree of these four factors on produced fluid temperature when they change were analyzed.The accuracy of the temperature model established in this paper was verified by comparing with field-measured data and other models.The results indicate that changes in inlet temperature of hot fluid have the greatest effect on produced fluid temperature,while changes in produced fluid quantity and hot fluid flow rate having a similar degree of effect,and the effect of changes in hot fluid heating depth is relatively small.The research results are of great significance for guiding the on-site production of cyclic hot fluid heating in heavy oil thermal recovery.
heavy oilthermal recoveryhot fluid circulationwellbore temperature
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