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与同心双管注饱和蒸汽不同,同心双管注过热型多元热流体过程中,无接箍油管与环形空间之间的热量交换可引起流体温度迅速变化。在充分考虑同心双管井筒内部热量传递的基础上,利用能量和动量守恒方程,结合海水扰流的井筒外传热模型,建立了海上同心双管注过热型多元热流体井筒传热模型。利用有限差分和迭代方法计算得到了无接箍油管和环形空间内过热型多元热流体的流动典型曲线,现场数据验证表明该模型具有良好的实用性。研究结果表明:该模型适用于不同注汽参数下同心双管井筒中热物性参数的分布预测,并可对海上SAGD及多元热流体吞吐的注汽参数进行优化;无接箍油管与环形空间的较小温差即可导致大量热能流动,引起温度和过热度迅速变化;海水流动对井筒热损失有显著影响;随着非凝结气质量分数增加,井筒内温度和过热度均下降。
Unlike concentric double-tube saturated steam injection, the heat exchange between the couplingless tubing and the annular space can cause the fluid temperature to rapidly change during the concentric double-tube injection of the overheated multi-component thermal fluid. On the basis of fully considering the heat transfer inside the concentric double-tube wellbore, the heat transfer model of the multi-thermal fluid wellbore with concentric double-pipe injection is established by using the energy and momentum conservation equation and the wellbore heat transfer model. The typical curves of the flow of the superheated multi-component hot fluid in the couplingless tubing and the annular space were calculated by the finite difference method and the iterative method. The field data shows that the model has good practicability. The results show that the model is suitable for predicting the distribution of thermal parameters in concentric double-tube wellbores under different steam injection parameters, and can optimize the steam injection parameters of offshore SAGD and multiple heat fluid swallow. Small temperature difference can lead to a large amount of heat flow, causing rapid changes of temperature and superheat. The seawater flow has a significant impact on the heat loss of the wellbore. With the increase of the non-condensable gas mass fraction, the temperature and superheat in the wellbore decrease.