中文摘要：

CO2驱既可实现提高原油采收率又可实现CO2气体的埋存，是一项非常有前景的三次采油技术。对于CO2驱，一项重要工作就是对CO2注入井筒中的温度、压力剖面进行较准确的计算，从而为优化井口注入参数以及井口注入系统设计提供理论依据。目前针对CO2注入井筒温度、压力剖面计算的相关研究由于未考虑CO2在井筒中的相态变化，因而计算结果精度较差。现将井筒中CO2的相态变化加以考虑，建立了CO2注入井井筒温度、压力计算模型，并根据三种相态方程的计算结果，选取了Peng—Robinson方程作为CO2密度及相态的计算方程。在此基础上，对CO2井口注入温度、注入量进行了敏感性研究，结果表明，二者对CO2注入井井筒温度、压力剖面均有一定影响。

英文摘要：

Carbon recovery, but also on dioxide gas flooding is a pro CO2 sequestration. For C02 mising tertiary oil recovery technology, flooding, an important job is to predict pressure profiles in injection well and to optimize the injection parameters, which in turn not only on enhanced oil accurate temperature and can provide a theoretical basis for an injection system design. Existing related research are often inaccurate for predicting the temperature profile in CO2 injection well because they do not consider the effects of CO2phase change in injection weUbore. A pressure-temperature calculation model is developed, which model incorporates the effects of CO2phase change in injection wellbore. Based on the predictions of the three EOS were tested against actual data, the Peng-Robinson equation of state is selected for use in the model. A field example is used to test the model and results show that the model is of high accuracy. In addition, a sensitivity study shows that the wellhead injection temperature and volume affect significantly the wellbore temperature and pressure profiles.