Modified smart water flooding for promoting carbon dioxide utilization in shale enriched heterogeneous sandstone under surface conditions for oil recovery and storage prospects

Enhanced Oil Recovery and CO2 Storage by Enhanced Carbonated Water Injection: A Mini-Review

“…Current ECW injection includes polymers, nanofluids, surfactants and LSW combined with CW injection for further improving development and the CO 2 storage effect. − Polymers, nanofluids, surfactants, and LSW effectively lower oil–water IFT, enhance wettability, and improve oil–water mobility ratio. − Additionally, nanofluids can generate separation pressures, thus increasing water-phase injection capacity and reducing injection pressure to enhance oil recovery . Integrating CW injection with the aforementioned methods offers synergistic advantages, increasing the CO 2 content in CW. − This integration is expected to further reduce IFT, enhance wettability, and increase both the porosity and permeability of the reservoir, thereby enhancing the recovery of the CW injection. − Additionally, certain ECW injection techniques facilitate improved CO 2 storage, attributable to increased CO 2 injection volumes. Chaturvedi et al , confirmed through experimental studies that due to the high viscosity and complex molecular structure of the polymer, the introduction of the polymer increased the dissolution and residence time of CO 2 in CW, and the recovery reached 52 to 65%.…”

Coal Wettability: A Holistic Overview of the Data Sets, Influencing Factors, and Knowledge Gaps

“…Carbon capture and storage (CCS) is considered an effective and scientifically proven technique for reducing anthropogenic CO 2 emissions in a safe manner. − This approach involves the injection of captured CO 2 into suitable subsurface geological formations, such as saline aquifers and depleted oil/gas reservoirs. − The secure confinement of CO 2 within these geological media is facilitated through various trapping mechanisms, including residual trapping, structural trapping, dissolution trapping, and mineral trapping. − Notably, shale formations and unmineable coal seams have also been tested for their suitability for geological storage of CO 2 . − Coal seams and shales can trap enormous volumes of CO 2 via adsorption trapping. , Particularly, the injection of CO 2 into the coal seams has been receiving increasing attention due to its dual advantages in geological CO 2 storage and enhanced coalbed methane (ECBM) recovery. − Coal seams have also been tested for their suitability for hydrogen (H 2 ) storage in the context of the transition toward clean energy . Indeed, studies have shown the potential of H 2 adsorption in coals as well, albeit much lower than CO 2 . , …”

Numerical Investigation on Flow-Field Characteristics towards Removal of Free-Water by A Separator with Coalescing Plates

“…With the intensive exploitation of oilfields, a variety of measures such as water flooding and chemical agents have been widely used, thus crude oil production and economic benefits have been guaranteed [1][2][3]. Subsequently, the prevalence of impurities such as water, sediment, and polymers are commonly present in the produced water from oil wells, respectively, the transportation and utilization of crude oil are affected and threats to the environment may increase [4][5].…”