In depth study of in situ combustion kinetics and coupling to flow
Abstract/Contents
- Abstract
- This thesis furthers understanding of three topics that are critical to In Situ Combustion (ISC) processes: crude oil kinetics, the tools used to model accurately and practically complex kinetic behavior and how oil kinetics couples with flow, especifically in systems with complex permeability distributions. On kinetics, we study the effects of pressure on crude oil kinetics for a large range of pressures and heating rates (1.5, 2.0, 5.0, 7.5, 8.0, 10.0, 15.0, 20.0, and 30.0 °C/min. Our results show that the activation energy of global reactions is not affected by changes in both partial pressure (21, 42, 50, 84, 209, and 250 psi) and absolute pressure (100-2000 psi) with values ranging 50 and 60 kJ/mol for the LTO regime and 90-100 kJ/mol for the HTO regime. Three different crude oils were tested. For one of the crude oils, we observe an increasing trend in oxygen consumption as absolute pressure is increased up to a critical pressure (~500 psi), after which it remains constant. This is associated to light component evaporation at low pressures, decreasing the amount of oil available for fuel generation. Total oxygen consumption starts to decrease again at very large pressures (> 1500 psi) and we associate it to water phase behavior at these conditions. We then propose a workflow and construct the corresponding tools to match Arrhenius-based reaction models for lab-scale numerical simulation models. The workflow is validated by matching multiple reaction models to experimental data obtained for a large range of heating rates (1.5-30 °C/min). On flow, we study instabilities that have been observed during combustion tube experiments by analyzing simple analogous problems and performing perturbation analysis from which we derive a new stability parameter. Finally, we propose and test a new experimental approach to observe directly how oil kinetics evolve under flow conditions by using thermal imaging and combining images with ramped temperature oxidation (RTO) experimental data. Results show that the reaction zone in lab conditions is in the order of centimeters. Reaction zone thicknesses range between 10-30 cm for the LTO zone and 10-50 cm for the HTO zone. Furthermore, we show how the new approach can help investigate complex systems and behaviors, such as oscillations, that could not otherwise be studied with conventional experiments.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2019; ©2019 |
| Publication date | 2019; 2019 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Koh Yoo, Kuy Hun |
|---|---|
| Degree supervisor | Kovscek, Anthony R. (Anthony Robert) |
| Thesis advisor | Kovscek, Anthony R. (Anthony Robert) |
| Thesis advisor | Castanier, Louis M |
| Thesis advisor | Gerritsen, Margot (Margot G.) |
| Degree committee member | Castanier, Louis M |
| Degree committee member | Gerritsen, Margot (Margot G.) |
| Associated with | Stanford University, Department of Energy Resources Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Kuy Hun Koh Yoo. |
|---|---|
| Note | Submitted to the Department of Energy Resources Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2019. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2019 by Kuy Hun Koh Yoo
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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