Pore scale interaction between matrix and fracture during miscible and immiscible CO2 injection was studied experimentally using visual models. Initially, visualization experiments were conducted on 2-D glass bead packed models by injecting n-heptane (solvent) displacing different kinds of processed oil. The focus was on the displacement patterns and solvent breakthrough controlled by matrix-fracture interaction and the pore scale behaviour of solvent-oil interaction for different fracture and injection conditions (rate, vertical vs. horizontal injection) as well as oil viscosity. Besides the visual investigation, effluent was also analyzed to calculate the solvent cut and oil recovery.
Next, the process was modeled numerically using a commercial compositional simulator and the saturation distribution in the matrix was matched to the experimental data. The key parameters in the matching process were the effective diffusion coefficients and the longitudinal and transverse dispersivities. The diffusion coefficients were specified for each fluid and dispersivities were assigned into grid blocks separately for the fracture and the matrix.
Finally, glass etched microfluidic models were used to investigate pore scale interaction between the matrix and the fracture. The models were prepared by etching homogeneous and heterogeneous micro scale pore patterns on glass sheets bonded together and then saturated with colored n-decane as the oleic phase. CO2 was injected at miscible and immiscible conditions. The focus was on visual pore scale analysis of miscibility, breakthrough of CO2 and oil/CO2 transfer between the matrix and the fracture under different miscibility, injection rate and wettability conditions. / Petroleum Engineering
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/425 |
| Date | 11 1900 |
| Creators | Er, Vahapcan |
| Contributors | Babadagli, Tayfun (Civil and Environmental Engineering), Kuru, Engin (Civil and Environmental Engineering), Mitra, Sushanta (Mechanical Engineering) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 13183439 bytes, application/pdf |
| Relation | Er, V. and Babadagli, T., 2007, "Visual Investigations on the Oil Recovery and Sequestration Potential of CO2 in Naturally Fractured Reservoir", CIPC 2007-33, Canadian International Petroleum Conference, Calgary, Alberta, June 12-14., Er, V. and Babadagli T., 2008, "Miscible Interaction between Matrix and Fracture: A Visualization and Simulation Study", SPE-117579, SPE Regional/AAPG Eastern Section Joint Meeting, Pittsburgh, Pennsylvania, October 11-15., Accepted for publication in SPE Reservoir Evaluation and Engineering Journal. |
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