Owing to the harmful consequences of the greenhouse effect, mankind has reached a consensus to reduce CO₂ emissions. CO₂ utilization and sequestration is considered the most feasible solution for realizing an effective and economical sequestration of CO₂. Herein, CO₂-enhanced oil recovery (EOR) is a representative strategy owing to its tremendous sequestration capacity and reasonable economic viability. However, the low sequestration stability and the accompanying secondary disasters have hindered its wider application. Considering this, a novel CO₂ utilization and sequestration technology, i.e., CO₂ electrochemical reduction (CO₂RR)-EOR technology was proposed and its effects and mechanisms were studied. First, a SnO₂ catalyst that can be used in the coreflooding experiments was synthesized and its efficiency on CO₂RR was evaluated. Then, coreflooding experiments using the SnO₂ catalyst were conducted to study the influence of CO₂RR on the CO₂ sequestration and oil recovery. Next, contact angle and interfacial tension were measured to analyze the effect of the CO₂RR on the CO₂-crude oil-brine-rock interaction. Finally, the CO₂RR-EOR mechanism was proposed. Multiple experiments revealed that the low-cost and easy-synthesis SnO₂ catalyst, which was characterized by the 3-dimensioned hierarchical and porous structure, was in the high efficiency and strong stability. Coreflooding results illustrated that the CO₂RR remarkably enhanced CO₂ sequestration and oil recovery. At the optimal cell potential of 3.75 V, the CO₂ sequestration efficiency and oil recovery were as high as 75.93% and 43.8%, respectively, which are much higher than those (50.56% and 37.9%, respectively) achieved in conventional CO₂ flooding. Contact angle and interfacial tension results indicated that the CO₂RR has a significant impact on the CO₂-crude oil-brine-rock interaction. At the optimal cell potential, the crude oil-contact angle and the interfacial tension were 36.2° and 8.9 mN/m, respectively, which are much lower than those (64.6° and 16.4 mN/m, respectively) achieved in conventional CO₂ flooding; the CO₂-contact angle was 52.2°, which too is much larger than that (31.7°) achieved in conventional CO₂ flooding. In this technology, the CO₂RR converts the injected CO₂ into formate to sequestrate itself, and meanwhile alters the CO₂-crude oil-brine-rock interactions, resulting in enhanced CO₂ wettability and consequently increases CO₂ trapping and retention; causing the weakened oil wettability and the enhanced oil-brine interaction, and finally enhances oil recovery. CO₂RR-EOR can be a novel, efficient, and economically-viable CO₂ utilization and sequestration technology, which provide a feasible option for the future industrial CO₂ emission reduction.

由于温室效应的有害后果，人类已经达成了减少CO ₂排放的共识。CO ₂的利用和封存被认为是实现有效且经济地封存CO ₂的最可行的解决方案。其中，CO ₂强化采油（EOR）因其巨大的封存能力和合理的经济可行性而成为具有代表性的策略。然而，低的封存稳定性和伴随的次生灾害阻碍了其更广泛的应用。考虑到这一点，一种新颖的CO ₂利用和封存技术，即CO ₂电化学还原（CO ₂提出了RR)-EOR技术，并对其效果和机理进行了研究。首先，合成了可用于岩心驱实验的 SnO _{2催化剂，并评估了其对 CO 2} RR 的效率。然后，利用SnO ₂催化剂进行了岩心驱实验，研究了CO ₂ RR 对CO ₂封存和采收率的影响。接下来，通过测量接触角和界面张力来分析CO ₂ RR 对CO ₂ -原油-盐水-岩石相互作用的影响。最后提出了CO ₂ RR-EOR机理。多项实验表明，低成本且易于合成的 SnO ₂催化剂具有三维分层多孔结构的特点，具有高效、稳定性强的特点。岩心驱结果表明，CO ₂ RR 显着提高了CO ₂封存和采收率。在3.75 V的最佳电池电压下，CO ₂封存效率和采收率分别高达75.93%和43.8%，远高于常规CO ₂驱的50.56%和37.9%。 . 接触角和界面张力结果表明，CO _{2 RR 对 CO 2}有显着影响。-原油-盐水-岩石相互作用。在最佳电池电位下，原油接触角和界面张力分别为36.2°和8.9 mN/m，远低于常规CO ₂驱的64.6°和16.4 mN/m。 ; CO ₂接触角为52.2°，远大于常规CO ₂驱的接触角（31.7°）。在该技术中，CO ₂ RR 将注入的 CO ₂转化为甲酸盐进行自我封存，同时改变了 CO ₂ -原油-盐水-岩石的相互作用，从而提高了 CO ₂的润湿性，从而增加了 CO ₂诱捕和保留；导致油润湿性减弱，油-盐水相互作用增强，最终提高采收率。CO ₂ RR-EOR是一种新颖、高效、经济可行的CO _{2利用与封存技术，为未来工业CO 2}减排提供了可行的选择。