Hot water injection is a production technique proposed to gas recovery from methane hydrate
reservoirs. However, from a practical point of view, the injected water experiences a drop in
temperature and re-formation of hydrates may occur in the reservoir. In this work, we proposed a
model expressing permeability hysteresis in the processes between hydrate growth and
dissociation, and studied hydrate dissociation behavior during hot water injection. The model of
permeability hysteresis was incorporated into the simulator MH21-HYDRES (MH21 Hydrate
Reservoir Simulator), where the decrease in permeability with hydrate saturation during hydrate
growth process was assumed to be much larger than the decrease during hydrate dissociation
process. Laboratory hydrate dissociation experiments were carried out for comparison. In each
experiment, we injected hot water at a constant rate into a sand-packed core bearing hydrates, and
the histories of injection pressure, core temperature, and gas/water production rates were
measured. Numerical simulations for the core experiments showed the re-formation of hydrates
led to the increase in injection pressure during hot water injection. The simulated tendencies of
pressure increase varied markedly by considering permeability hysteresis. Since the experimental
pressure increases could not be reproduced without the permeability hysteresis model, the
influence of permeability hysteresis should be considered to apply hot water injection to hydrate
reservoirs.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:BVAU.2429/2424 |
| Date | 07 1900 |
| Creators | Konno, Yoshihiro, Masuda, Yoshihiro, Takenaka, Tsuguhito, Oyama, Hiroyuki, Ouchi, Hisanao, Kurihara, Masanori |
| 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 | text |
| Rights | Konno, Yoshihiro |
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