Research And Application Of Temperature Distribution For Two-Phase Flow In Vertical Pipes

The physical property and rheological behavior parameters of the multiphase flow in the wellbore are sensible functions of temperature. Hence, exact calculation of temperature distribution is the significant basement of forecasting its pressure distribution, proceeding optimization procedure and analysis of its behavior.Aimed at the actual production in oil/gas field development, and based on multiphase flow mechanics and thermal conduction theory, the thesis establishes a mathematical model which includes steady-state heat transfer in the wellbore and unsteady-state heat conduction in the formation. Two-phase flow model is adopted in calculating coefficient of heat transfer. Moreover, in order to simplify calculation, the model collates and establishes experimental two-phase heat transfer relations for the use of different flow pattens and mediums.According to the model, not only assortative temperature distribution programmes of some of petroleum engineerings which contain conventional well, electrical heating, hot fluid injection and steam injection are composed, but also the comparative analysis between single-phase flow and two-phase flow temperature distribution is done. For the hot fluid injection well, the affecting factors on the temperature distribution have been analyzed under the density, specific heat, flow rate and the temperature of injected hot fluid. For the electrical heating well, different heating efficiencies have been analyzed. For the steam injection well, the temperature distribution and the dryness fraction diatribution have been counted. From above on, some conclusions and suggestions are obtained.