Yu, Kai Bin;
Bowers, Geoffrey M;
Yazaydin, A Ozgur;
(2022)
Supercritical carbon dioxide enhanced natural gas recovery from kerogen micropores.
Journal of CO2 Utilization
, 62
, Article 102105. 10.1016/j.jcou.2022.102105.
Preview |
Text
Yu_Supercritical carbon dioxide enhanced natural gas recovery from kerogen micropores_VoR.pdf - Published Version Download (4MB) | Preview |
Abstract
As the global energy demand increases, a sustainable and environmentally friendly methane (CH4) extraction technique must be developed to assist in the transition off of fossil fuels. In recent years, supercritical carbon dioxide (CO2) has been poised as a candidate for enhanced gas recovery (EGR) from CH4-rich source rocks, potentially with the reservoir serving as a carbon sink for CO2. However, the underlying molecular-scale mechanisms of CO2-EGR processes are still poorly understood. Using constant chemical potential molecular dynamics (CMD), this study investigates the CH4 recovery process via supercritical CO2 injection into immature (Type I-A) and overmature (Type II-D) kerogens in real-time and at reservoir conditions (365 K and 275 bar). A pseudo-second order (PSO) rate law was used to quantify the adsorption and desorption kinetics of CO2 and CH4. The kinetics of simultaneous adsorption/desorption are rapid in immature kerogen due to better connected pore volume facilitating fluid diffusion, whereas in overmature kerogen, the structural heterogeneity hinders fluid diffusion. Estimated second order kinetic rate coefficients reveal that CO2 adsorption and CH4 desorption in Type I-A are about two times and an order of magnitude faster, respectively, compared to those of in Type II-D. Furthermore, overmature Type II-D kerogen contains inaccessible micropores which prevent full recovery of CH4. For every CH4 molecule replaced, at least two and six CO2 molecules are adsorbed in Type-II-D and Type I-A kerogens, respectively. Overall, this study shows that CO2 injection can achieve 90 % and 65 % CH4 recovery in Type I-A and Type II-D kerogens, respectively.
| Type: | Article |
|---|---|
| Title: | Supercritical carbon dioxide enhanced natural gas recovery from kerogen micropores |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jcou.2022.102105 |
| Publisher version: | https://doi.org/10.1016/j.jcou.2022.102105 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Molecular simulation, Carbon sequestration, Adsorption kinetics, Hydraulic fracturing, Enhanced gas recovery |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10150956 |
Loading...
Loading...Loading...Loading...Archive Staff Only
 |
View Item |
