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针对在进行凝析气井生产动态分析以及优化设计过程中深水凝析气井井筒压力、温度分布预测、采气工艺等重要问题。考虑应用SRK状态方程与相平衡闪蒸计算模型结合的方法并对此方法进行充分研究。想要构建以相态变化的深水凝析气井的井筒压力和温度耦合的计算模型为基础的计算模型。然而深水凝析气井还存在井身温度分布不规律,气井在海水中暴露的长度较大,井身的传热与地层部位有不同的规律。凝析气还存在井筒里面发生的相态变化比较复杂,这些问题导致单单是设计计算模型是不远远够的。最终还要利用四阶龙格库塔法对计算模型进行解答才能预得到较为完整的数学模型。这样便可以利用建好的数学模型并且通过提供实际的数学参数计算得出水凝析气井井筒内压力以及温度分布。该模型能够预测出水中气井的生产动态分布等问题,能为今后的深水采气工作提供完整数学理论基础。
Aiming at the important problems such as wellbore pressure, temperature distribution forecasting, gas production technology during dynamic analysis and optimization design of condensate gas well production. The method of combining the SRK equation of state with the phase equilibrium flash computing model is considered and the method is fully studied. We want to build a computational model based on the computational model of wellbore pressure and temperature coupling in a deep-water condensate gas well with phase changes. However, the deep well condensate gas well also has the irregular distribution of wellbore temperature. The length of gas well exposed in seawater is large, and the heat transfer between wellbores and the stratum part have different laws. Condensate gas also exists in the wellbore inside the phase change is more complicated, these problems led to the design calculation model is not far enough. Finally, the fourth-order Runge-Kutta method should be used to solve the calculation model to get a more complete mathematical model. In this way, the built-in mathematical model can be used to calculate the pressure and temperature distribution in the well of the condensate gas well by providing actual mathematical parameters. The model can predict the production distribution of gas wells in water and other issues, and can provide a complete mathematical theory foundation for the future deep-water gas production.