| Title | Coupled miscible carbon utilization-storage processes in fractured shales |
| Authors | Zhang, Kaiqiang Jin, Zhijun Li, Songyan |
| Affiliation | Peking Univ, Inst Energy, Beijing 100871, Peoples R China Sinopec Petr Explorat & Prod Res Inst, Beijing 100083, Peoples R China China Univ Petr East China, Coll Petr Engn, Qingdao 266580, Peoples R China China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Minist Educ, Qingdao 266580, Peoples R China |
| Keywords | ENHANCED OIL-RECOVERY PHASE-BEHAVIOR CO2 INJECTION CONFINED FLUIDS TIGHT-OIL CAPILLARY-PRESSURE GAS MISCIBILITY RESERVOIRS SIMULATION |
| Issue Date | 1-Aug-2022 |
| Publisher | CHEMICAL ENGINEERING JOURNAL |
| Abstract | Geological carbon storage and utilization is commonly-accepted as the most feasible approach to mitigate carbon emissions in energy transition period. Shale reservoirs attract special attentions due to their huge amounts of reserves and wide distributions worldwide. In the meantime, improved technologies are required to implement the production and storage projects in the shale reservoirs because dramatic changes of phase and production properties occur and most conventional methods become inapplicable. Here, first, a field-scale numerical reservoir simulation is developed to model the miscible CO2 utilization in the fractured shale reservoirs. Second, an analytical nanoscale-extended theory model is proposed to calculate a series of basic physiochemical properties and production parameters by including the intermolecular interactions and confinement effects. Third, the CO2 post-production storage is specifically investigated in fractured shale reservoirs. All models developed in this study are compared with and verified by the literature data. Continuous CO2 injection is applied for an 800-day EOR process in the fractured shale reservoir. With the production time, the reservoir oil saturations and pressures become lower, while the gas saturations and cumulative oil productions/oil recovery factors become higher. Moreover, the confinement effect is beneficial to enhance oil productions. The miscible CO2 injection is achieved through, at least in majority, the vaporization process based on the compositional analysis results. On the other hand, in comparison with the conventional reservoirs, the shale reservoirs with nanopores are proven to be more promising for the post-production CO2 storage due to larger caprock sealing pressure, maximum storage height, and storage capacity. The amount of CO2 trapped in the reservoir with confinement is three time as large as that without confinement. Overall, this study provides numerical simulation and analytical theory for the investigation and application of the coupled processes of miscible CO2 utilization and post-production geological storage in fractured shales. |
| URI | http://hdl.handle.net/20.500.11897/648880 |
| ISSN | 1385-8947 |
| DOI | 10.1016/j.cej.2022.135987 |
| Indexed | SCI(E) |
| Appears in Collections: | 待认领 |
