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目前CO2已经被用作有效的驱油剂,CO2到达井底时的热力状态对驱油效果有较大影响.针对影响井底CO2压力和温度的因素,根据液态CO2在竖直井筒中的热量传递原理和流体流动理论,在Ramey建立的物理模型基础上,建立了液态CO2井筒流动与传热数学模型,通过求解实例,得到井筒内液态CO2温度和压力的分布规律以及各因素对井底CO2参数的影响.结果表明:井筒内CO2的温度和压力随井深的增加而近似成线性增加;当注入速率增大时,气液分界面加深;井底温度随入口流量的增加而降低,而受入口温度的影响较小;井底压力随井口注入压力的增加而成比例增加,随着流量的增加呈先增后减的趋势;环空介质采用清水比空气的导热效果好.
At present, CO2 has been used as an effective oil displacement agent, and the thermal state of CO2 when it reaches the bottom of the well has a great influence on the displacement effect.According to the factors that affect the pressure and temperature of bottom hole CO2, according to the heat of liquid CO2 in the vertical wellbore Based on the physical model established by Ramey, the flow and heat transfer mathematical model of liquid CO2 wellbore was established. By solving the example, the distribution law of temperature and pressure of liquid CO2 in the wellbore and the influence of various factors on the well CO2 The results show that the temperature and pressure of CO2 in the wellbore increase linearly with the increase of the well depth. When the injection rate increases, the gas-liquid interface deepens and the bottomhole temperature decreases with the increase of inlet flow rate. The influence of inlet temperature is small; the bottom hole pressure increases proportionally with the increase of injection pressure at the wellhead, and then increases first and then decreases with the increase of flow rate;