Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 159-175). Ongoing efforts to mitigate climate change include the understanding of natural and engineered pr...
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ftmit:oai:dspace.mit.edu:1721.1/111445 2023-06-11T04:12:36+02:00 Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems Fu, Xiaojing, Ph. D. Massachusetts Institute of Technology Ruben Juanes. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. 2017 175 pages application/pdf http://hdl.handle.net/1721.1/111445 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/111445 1003292875 MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Civil and Environmental Engineering Thesis 2017 ftmit 2023-05-29T08:22:18Z Thesis: Ph. D., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 159-175). Ongoing efforts to mitigate climate change include the understanding of natural and engineered processes that can impact the global carbon budget and the fate of greenhouse gases (GHG). Among engineered systems, one promising tool to reduce atmospheric emissions of anthropogenic carbon dioxide (CO₂) is geologic sequestration of CO₂ , which entails the injection of CO₂ into deep geologic formations, like saline aquifers, for long-term storage. Among natural contributors, methane hydrates, an ice-like substance commonly found in seafloor sediments and permafrost, hold large amounts of the world's mobile carbon and are subject to an increased risk of dissociation due to rising temperatures. The dissociation of methane hydrates releases methane gas-a more potent GHG than CO₂-and potentially contributes to a positive feedback in terms of climatic change. In this Thesis, we explore fundamental mechanisms controlling the physics of geologic CO₂ sequestration and natural gas hydrate systems, with an emphasis on the interplay between multiphase flow-the simultaneous motion of several fluid phases and phase transitions-the creation or destruction of fluid or solid phases due to thermodynamically driven reactions. We first study the fate of CO₂ in saline aquifers in the presence of CO₂ -brine-carbonate geochemical reactions. We use high-resolution simulations to examine the interplay between the density-driven convective mixing and the rock dissolution reactions. We find that dissolution of carbonate rock initiates in regions of locally high mixing, but that the geochemical reaction shuts down significantly earlier than shutdown of convective mixing. This early shutdown reflects the important role that chemical speciation plays in this hydrodynamics-reaction coupled process. We then study hydrodynamic and ... Thesis Ice permafrost DSpace@MIT (Massachusetts Institute of Technology) |
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Civil and Environmental Engineering Fu, Xiaojing, Ph. D. Massachusetts Institute of Technology Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems |
topic_facet |
Civil and Environmental Engineering |
description |
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 159-175). Ongoing efforts to mitigate climate change include the understanding of natural and engineered processes that can impact the global carbon budget and the fate of greenhouse gases (GHG). Among engineered systems, one promising tool to reduce atmospheric emissions of anthropogenic carbon dioxide (CO₂) is geologic sequestration of CO₂ , which entails the injection of CO₂ into deep geologic formations, like saline aquifers, for long-term storage. Among natural contributors, methane hydrates, an ice-like substance commonly found in seafloor sediments and permafrost, hold large amounts of the world's mobile carbon and are subject to an increased risk of dissociation due to rising temperatures. The dissociation of methane hydrates releases methane gas-a more potent GHG than CO₂-and potentially contributes to a positive feedback in terms of climatic change. In this Thesis, we explore fundamental mechanisms controlling the physics of geologic CO₂ sequestration and natural gas hydrate systems, with an emphasis on the interplay between multiphase flow-the simultaneous motion of several fluid phases and phase transitions-the creation or destruction of fluid or solid phases due to thermodynamically driven reactions. We first study the fate of CO₂ in saline aquifers in the presence of CO₂ -brine-carbonate geochemical reactions. We use high-resolution simulations to examine the interplay between the density-driven convective mixing and the rock dissolution reactions. We find that dissolution of carbonate rock initiates in regions of locally high mixing, but that the geochemical reaction shuts down significantly earlier than shutdown of convective mixing. This early shutdown reflects the important role that chemical speciation plays in this hydrodynamics-reaction coupled process. We then study hydrodynamic and ... |
author2 |
Ruben Juanes. Massachusetts Institute of Technology. Department of Civil and Environmental Engineering. |
format |
Thesis |
author |
Fu, Xiaojing, Ph. D. Massachusetts Institute of Technology |
author_facet |
Fu, Xiaojing, Ph. D. Massachusetts Institute of Technology |
author_sort |
Fu, Xiaojing, Ph. D. Massachusetts Institute of Technology |
title |
Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems |
title_short |
Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems |
title_full |
Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems |
title_fullStr |
Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems |
title_full_unstemmed |
Multiphase flow in porous media with phase transitions : from CO₂ sequestration to gas hydrate systems |
title_sort |
multiphase flow in porous media with phase transitions : from co₂ sequestration to gas hydrate systems |
publisher |
Massachusetts Institute of Technology |
publishDate |
2017 |
url |
http://hdl.handle.net/1721.1/111445 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_relation |
http://hdl.handle.net/1721.1/111445 1003292875 |
op_rights |
MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768388557676740608 |