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中文摘要：
油井注CO2采油,在CO2停注关井后,井筒不同位置处温度与地层温度不相同,存在井筒和地层的热交换,变化的温度和井筒储集流动共同影响井底压力.为了正确模拟关井后不同时刻的井筒压力,温度,密度和速度分布,建立了一个基于CO2注入的井筒管流及地层渗流热流耦合数学模型,对地层气体渗流采用半解析半数值的求解,对井筒流动使用PISO方法来进行数值计算.计算结果表明：关井后热效应对井底压力导数曲线的早期形态有明显的影响,因而可以分析热效应对井底压力的影响,正确指导CO2注入工艺.
英文摘要：
CO2 is often injected into an oil well to explore for oil.After shutting the well and suspending the injection,the temperature of any location in the wellbore is different from that of the location in earth formation at the same level of depth.So there is heat exchange between the wellbore and earth formation,and the varying temperature and wellbore storage both have an influence on the pressure at the bottom hole of the wellbore.A pressure model and its calculation of well test for gas wells with CO2 injection considering thermal effect was presented to give correct numerical simulation to the profile of pressure,temperature,density and velocity in the wellbore at any time after shutting the well.In this model,a reservoir model was connected to the pipe flow model in the wellbore.The reservoir model was solved half-analytically and half-numerically,while the pipe flow model in wellbore was solved numerically with the method of PISO.The result of calculation shows that after shutting the well the thermal effect has an obvious influence on the shape of curve of the bottom hole pressure derivative in the early period,thus facilitating CO2 injection.
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