Abstract:

Based on the homogeneous equilibrium flow model，combining the momentum equation and energy equation，a coupling mathematical model for solving the pressure，

temperature and density profile of foam fluid flowing in wellbore is set up.The model is solved by programming.The pressure，temperature and density profile of foam fluid

along the wellbore are obtained.The results show that the fluid properties are interactional and interdependent.The higher the foam quality is，the greater the temperature

change is，while changes of the pressure and the density are not notable.When the foam fluid is used to deep well operation，the influence of the temperature on the foam

properties and performance can not be ignored.Because the coupling model takes the temperature and wellbore heat transfer into account，it is more universal than the

conventional method.

Key words: foam fluid, compressible, mathematical model, wellbore, coupling