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Effect of supercritical carbon dioxide adsorption on oil displacement in tight reservoir
- Source :
- Case Studies in Thermal Engineering, Vol 24, Iss, Pp 100880-(2021)
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The effect of CO2 adsorption on oil displacement in tight reservoirs is analyzed. The composition of clay minerals in a reservoir is analyzed, and a molecular model of the formed rock structure is established to investigate the adsorption characteristics of different clay minerals on the fluid. The effect of CO2 adsorption on oil displacement is investigated through a CO2 injection experiment. The results show that the adsorption capacity of reservoir minerals is greater for light hydrocarbons than for heavy hydrocarbons as well as for water and CO2 than for hydrocarbons, indicating that the oil recovery rate of the reservoir composed primarily of silica is higher when supercritical CO2 and water are alternately injected. The oil recovery can reach 23.78% by water and CO2 alternate flooding. Intermittent stop injection enable CO2 to enter rock samples more easily, and crude oil can subsequently be discharged more easily. As the mixing of CO2 and crude oil cannot be realized under the experimental conditions, the intermittent stop injection time is short and the gravity migration in tight cores is slow. Hence, we infer that the adsorption of CO2 significantly affects the displacement of tight reservoirs.
- Subjects :
- Gravity (chemistry)
020209 energy
Gas channeling
Mixing (process engineering)
02 engineering and technology
Molecular dynamics
01 natural sciences
Oil displacement
Supercritical carbon dioxide
Adsorption
Tight oil
0202 electrical engineering, electronic engineering, information engineering
Engineering (miscellaneous)
Fluid Flow and Transfer Processes
Chemistry
Supercritical fluid
010406 physical chemistry
0104 chemical sciences
Chemical engineering
lcsh:TA1-2040
Water gas alternative flooding
lcsh:Engineering (General). Civil engineering (General)
Clay minerals
Displacement (fluid)
Subjects
Details
- ISSN :
- 2214157X
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Case Studies in Thermal Engineering
- Accession number :
- edsair.doi.dedup.....231c54310c154bbf15ed910029de03b4
- Full Text :
- https://doi.org/10.1016/j.csite.2021.100880