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Roles of Flue Gas in Promoting Steam Flow and Heat Transfer in Multithermal Fluid Flooding

机译：烟气在多热流体驱中促进蒸汽流动和传热的作用

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摘要

Multithermal fluid technology is becoming an important method in the field of heavy oil development. However, because of insufficient investigation on the heat transfer for the multithermal fluid, some development phenomena and characteristics still cannot be well explained. In order to determine the effect of flue gas on the thermal swept scope, multithermal fluid flooding experiments were carried out through 1D sandpack. The temperatures along the sandpack were measured. On this basis, steam heat transfer simulation experiments were conducted and the heat transfer coefficients were calculated. The mechanism of flue gas on steam heat transfer was analyzed. The results show that at the same heat injection conditions, the thermal swept scope for the multithermal fluid flooding was larger than that for the steam flooding. With the increase of flue gas proportion in the multithermal fluid, the heat transfer coefficient decreased and the condensation pattern was transformed from drop condensation to film condensation gradually. The flue gas can form gas film on the surface of the cold body and inhibit the heat transfer between steam and the cold body. Because of the inhibiting effect of flue gas on steam heat transfer, flue gas can reduce the heat transferred to the rock matrix in flooding and thus promote steam to carry more heat further. Meanwhile, flue gas can accelerate the flow of steam in porous media, which also leads to the expansion of the thermal swept scope for the multithermal fluid flooding.
机译：多元热流体技术正在成为重油开发领域的重要方法。但是，由于对多元热流体的传热研究不足，尚不能很好地解释一些发展现象和特征。为了确定烟气对热扫范围的影响，通过一维沙堆进行了多热流体驱油实验。测量了沿沙袋的温度。在此基础上，进行了蒸汽传热模拟实验，并计算了传热系数。分析了烟气对蒸汽传热的机理。结果表明，在相同的注热条件下，多热流体驱的热扫范围要大于蒸汽驱的热扫范围。随着多元热流体中烟气比例的增加，传热系数降低，冷凝模式逐渐由滴状冷凝转变为膜状冷凝。烟气可在冷体的表面上形成气膜，并抑制蒸汽与冷体之间的热传递。由于烟道气对蒸汽传热的抑制作用，烟道气可以减少水驱过程中传递给岩体的热量，从而促进蒸汽进一步携带更多的热量。同时，烟气可以加速蒸汽在多孔介质中的流动，这也导致了多热流体驱油的热扫范围扩大。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第4期|4989375.1-4989375.8|共8页
  • 作者

    Wang Zhuangzhuang; Li Zhaomin;

  • 作者单位

    China Univ Petr East China, Coll Petr Engn, Qingdao 266580, Peoples R China;

    China Univ Petr East China, Coll Petr Engn, Qingdao 266580, Peoples R China;

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