For cleaner production of heavy oil with lower fossil fuel consumptions, solar thermal enhanced oil recovery (Solar TEOR) technologies are increasingly researched nowadays. However, the intermittency of solar radiation and inferior energy efficiency of steam flooding restricted industrial applications of Solar TEOR methods in oilfield. In this work, the eutectic NaCl–KCl and graphite were loaded into the biomass gelling matrix (crosslinked methylcellulose network) through supramolecular interactions. Then, a thermal energy storage biogel (NaCl–KCl)@G/MC with high thermal conductivity (2.06 W m⁻¹·K⁻¹), latent heat storage capacity (melting enthalpy: 112.4 J g⁻¹ at 352.4 °C) and thermal reliability (melting enthalpy retention up to 94.4% after 30 cycles), was synthesized for improving the continuousness of solar thermal supply and energy efficiency of steam flooding. From the experimental results, the proposed oil recovery method — solar powered steam flooding in daytime + the thermal-storage biogel heated N₂ flooding in nighttime — can meet the all-weather 24/7 production of heavy oil and improve energy efficiency (oil-steam ratio and thermal efficiency up to 0.56 and 62.1%). With (NaCl–KCl)@G/MC biogel assistance, energy consumption of oil production was decreased from 153.1 J·(mL oil)⁻¹ to 9.9 J·(mL oil)⁻¹ as the cost reduction of 19.8% in comparison with intermittent solar steaming. This study offers a candidate design to achieve a continuous thermal recovery of heavy oil entirely powered by solar energy, promoting the solar thermal technologies in oil industry operations.

为了清洁生产低化石燃料消耗的重油，太阳能热能提高石油采收率（Solar TEOR）技术现在得到越来越多的研究。然而，太阳辐射的间歇性和蒸汽驱能效低等因素限制了太阳能TEOR方法在油田的工业应用。在这项工作中，共晶 NaCl–KCl 和石墨通过超分子相互作用被加载到生物质胶凝基质（交联甲基纤维素网络）中。然后，储热生物凝胶 (NaCl–KCl)@G/MC 具有高导热性 (2.06 W m ⁻¹ ·K ⁻¹ )、潜热储存能力（熔化焓：112.4 J g ⁻¹在 352.4 °C) 和热可靠性（30 个循环后熔化焓保持率高达 94.4%），以提高太阳能供热的连续性和蒸汽驱的能源效率。从实验结果来看，提出的采油方式——白天太阳能蒸汽驱+夜间蓄热生物凝胶加热N ₂驱——能够满足稠油全天候24/7生产，提高能源效率（油-蒸汽比和热效率高达 0.56 和 62.1%)。^{在(NaCl–KCl)@G/MC生物凝胶的辅助下，石油生产的能源消耗从153.1 J·(mL oil) -1}降低到9.9 J·(mL oil) ^-1与间歇式太阳能蒸汽相比，成本降低了 19.8%。本研究提供了一种候选设计，以实现完全由太阳能驱动的重油的连续热采，促进石油工业运营中的太阳能热利用技术。