The objective of this study was primarily directed to the development of experimental setups to investigate the potential of supercritical multithermal fluid (SCMTF) flooding processes. Then, the recovery mechanisms of SCMTF flooding were proposed for the first time. Finally, the impact of the injection temperature, injection pressure, injection rate, and supercritical nitrogen (scN₂) and supercritical carbon dioxide (scCO₂) mixture amount on the SCMTF flooding performance were systematically studied in this research. The results show that SCMTF flooding is a technically and economically viable recovery process for deep heavy oil reservoirs. Supercritical water (SCW) has a greater role than the scN₂ + scCO₂ mixture in SCMTF flooding. The most-efficient SCMTF flooding recovered an additional 32.24% of the original oil in place (OOIP) compared to steam flooding. The injection of SCMTF at a high temperature or pressure is beneficial for the production of heavy oil. However, the high yield of coke produced at a high temperature may lead to potential formation damage. Thus, using an intermediate amount of the scN₂ + scCO₂ mixture in SCMTF may lead to more efficient and economical performance.

这项研究的目的主要是为了开发实验装置，以研究超临界多热流体（SCMTF）驱油工艺的潜力。然后，首次提出了SCMTF泛洪的恢复机制。最后，系统地研究了注入温度，注入压力，注入速率以及超临界氮（scN ₂）和超临界二氧化碳（scCO ₂）混合量对SCMTF驱油性能的影响。结果表明，SCMTF驱替技术是深层稠油油藏的技术和经济可行性。超临界水（SCW）的作用比scN ₂ + scCO _2大SCMTF驱替中的混合物。与蒸汽驱相比，最高效的SCMTF驱替又能回收原始油（OOIP）的32.24％。在高温或高压下注入SCMTF有利于生产重油。然而，高温下产生的高焦炭产量可能导致潜在的地层破坏。因此，使用SCN的中间量₂ + SCCO ₂在SCMTF混合物可导致更有效和经济性能。