方法　针对多孔介质中挥发性油渗流问题开展了研究 ,根据伴有相变过程的气液两相渗流的理论 ,建立了相应的压力特征方程 ;描述了挥发性油井在脱气渗流过程中压力随时间和距离的变化规律 ;给出了无限大油藏以定量生产情况下的解析解。目的　完善这一渗流力学的理论和试井分析方法。结果　气体挥发对多孔介质中流体的渗流有较大影响 ,挥发强度越大 ,压力曲线上翘幅度越大。结论　对于挥发性较强的油田和油井 ,有必要考虑这一相变渗流特征 Aiming at the problem of seepage flow of volatile oil in porous media, the method was applied to study the pressure characteristic equation of gas-liquid two-phase seepage accompanied with the phase change process. The pressure response of volatile oil well during degassing seepage was described Time and distance. The analytical solution of infinite reservoirs with quantitative production is given. Objective To improve this theory of seepage mechanics and well test analysis. Results The gas volatilization had a great influence on the fluid seepage in the porous media. The larger the volatility, the larger the pressure curve upturned. Conclusion For volatile oil fields and wells, it is necessary to consider this phase change seepage characteristics