Normally, the recovery effect of a heavy-oil reservoir gradually deteriorates after multiple rounds of cyclic steam stimulation (CSS). However, the injection of flue gas can effectively increase the utilization degree of steam heat energy, which improves the recovery effect. In this paper, an experimental method for CSS using an energy storage container was established. Based on this method, a one-dimensional core physical simulation experiment for CSS under different flue gas ratios was performed. During the experiment, the changes in temperature field, oil production rate, increase in backpressure, and oil recovery factors were tested. In addition, differences in these data under different injection steam-flue gas ratios were compared. The results show that the flue gas provides a channel of fluids in porous media for steam, which is conducive to the heat transfer of steam to the deeper part of the sandpack. The sandpack has a higher temperature in each cycle than the CSS. The core temperature of each round of flue-gas-assisted CSS is higher than that of the CSS. The final oil recovery factors of flue-gas-assisted CSS using different steam-flue gas ratios are 22.2, 26.7, 30.8, 24.4, and 21.6%, while that of CSS is only 17.2%. According to the experiment, it is concluded that the best steam-flue gas ratio to optimize the flue-gas-assisted CSS is 1:10. With the combined effect of three factors (the temperature field of the sandpack, energizing effect of the flue gas, and degree of oil during recovery), the flue-gas-assisted CSS using the steam-flue gas ratio of 1:10 maximizes the steam heat transfer, increases the energy of return discharge, replenishes formation energy, and improves the oil recovery factor. Through the experiment, the research results provide theoretical guidance for improving the effectiveness of the CSS of heavy-oil reservoirs.

中文翻译：

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浅层稠油油藏条件下烟气辅助循环蒸汽吞吐实验研究——汽烟比优化

通常情况下，稠油油藏经过多轮蒸汽吞吐（CSS）后采收效果逐渐恶化。但喷入烟气可有效提高蒸汽热能的利用程度，提高回收效果。在本文中，建立了一种使用储能容器的 CSS 实验方法。基于该方法，开展了不同烟气比下CSS的一维堆芯物理模拟实验。实验过程中，测试了温度场、采油率、背压增加量和采油率等因素的变化。此外，还比较了不同注汽-烟气比下这些数据的差异。结果表明，烟气为蒸汽提供了多孔介质中的流体通道，有利于蒸汽传热到填砂较深的部位。沙包在每个循环中的温度都高于 CSS。每轮烟气辅助CSS的核心温度均高于CSS。不同汽烟比的烟气辅助CSS最终采油率分别为22.2、26.7、30.8、24.4和21.6%，而CSS仅为17.2%。根据实验得出优化烟气辅助CSS的最佳汽烟比为1:10。在砂堆温度场、烟气增能效果、回收过程中含油程度三个因素的综合作用下，汽烟比为1:10的烟气辅助CSS最大程度地提高了回收率。蒸汽传热，增加回排能量，补充地层能量，提高采收率。通过实验，研究结果为提高稠油油藏CSS的有效性提供了理论指导。