CO₂ is injected into oil reservoirs to improve oil recovery and sequester greenhouse gas. However, the high mobility of CO₂ leads to poor sweep efficiency; consequently, a large volume of oil in the reservoir is left behind, limiting the oil recovery and CO₂ storage. This paper introduces water-saturated CO₂ injection to improve oil recovery and CO₂ storage by reducing the mobility of the CO₂. Unlike carbonated water injection, in which the fluid is mostly water, the fluid in water-saturated CO₂ injection is less than 1% water.

Water-saturated CO₂ injection and CO₂ injection are compared experimentally using Bentheimer sandstone cores that contain oil. Oil recovery, pressure difference across the core, and compositions and rates of the produced fluids are recorded. The ultimate pressure difference across the core samples during water-saturated CO₂ injection is found to be 4.76–9.55 times that the ultimate pressure difference during CO₂ injection—indicating reduced CO₂ mobility during water-saturated CO₂ injection. To investigate the impact of this mobility reduction on oil recovery and CO₂ storage, three-dimensional field-scale simulations are run. Simulations show that in the low permeable layer, the sweep efficiency during water-saturated CO₂ injection exceeds that during CO₂ injection. Consequently, the simulations find water-saturated CO₂ injection to yield 7% higher oil recovery and 1.14 mega-tons additional CO₂ stored than does CO₂ injection.

将CO ₂注入到储油层中，以提高采收率并隔离温室气体。但是，CO ₂的高迁移率导致吹扫效率低；因此，在油藏中留下了大量的油，限制了油的回收和CO _2的储存。本文介绍了水饱和的CO ₂注入，以提高油回收和CO ₂通过减少CO的移动性存储₂。与碳酸水注入中的流体主要是水不同，水饱和的CO ₂注入中的流体少于1％的水。

使用含油的Bentheimer砂岩岩心，对水饱和的CO ₂注入和CO ₂注入进行了实验比较。记录油采收率，岩心压力差以及产出液的组成和速率。发现在水饱和的CO ₂注入过程中，整个岩心样品的最终压力差是在CO ₂注入过程中的最终压力差的4.76-9.55倍-表明在水饱和的CO ₂注入过程中，CO _2的迁移率降低。研究这种迁移率降低对石油采收率和CO _2的影响在存储过程中，将进行三维场尺度模拟。模拟表明，在低渗透层中，水饱和的CO ₂注入期间的波及效率超过了CO ₂注入期间的波及效率。因此，模拟发现水饱和的CO ₂注射到产生较高的7％的油回收率和1.14兆吨额外的CO ₂储存比确实CO ₂注入。