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中文摘要：
分层配注CO2是解决注气提高采收率过程中不同地层间的层间矛盾,实现不同渗透性的地层都能够有效地注入CO2,维持地层压力,提高气驱动用储量和采收率的重要手段。基于分层配注CO2的思想,考虑井筒温度和CO2相态的变化建立了井筒温度压力耦合数学模型,根据注气时段,建立了地层吸气模型,并耦合气嘴嘴损建立了考虑多个注气层的注入井数学模型,提出了相应的数值求解方法。模拟计算结果表明：要提高较差注气能力油层的配注量,井口注气压力需要达到一个临界值,合理地选择井口注气压力和气嘴直径是实现分层配注的关键。该研究成果为分层配注CO2提供了重要的理论依据。
英文摘要：
Separate layer CO2 injection is an important method to settle the contradictions among layers in the process of gas injection EOR and it can,ensure effective injection of CO2 into layers with different permeabilities,maintain formation pressure and improve producing reserves of gas drive and recovery.Based on the idea of separate layer CO2 injection,this paper establishes a temperature-pressure coupling mathematical model considering the temperature of wellbore and the phase change of CO2,a gas-injection of reservoir model depending on the period of gas-injection and an injection well model coupling choke loss and taking multilayers into consideration,then proposes a corresponding numerical method.Simulation and calculation results show that wellhead injection pressure should reach a critical value in order to improve the injection rate of reservoir with poor gas-injection capacity.Choosing the wellhead injection pressure and the choke diameter reasonably is the key to fulfilling separate layer CO2 injection.The research results provide a theoretical support for separate layer CO2 injection.
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