Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity
Recent research activity has demonstrated the viability of producing methane from gas hydrate bearing sediments by injecting and sequestering CO2 in a process where CO2 replace methane in gas hydrate by a process called CO2 - CH4 exchange. The work presented in this thesis consist of a series of ten...
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ftunivbergen:oai:bora.uib.no:1956/6779 2023-05-15T17:12:12+02:00 Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity Berge, Hans 2013-06-01 15316468 bytes application/pdf https://hdl.handle.net/1956/6779 eng eng The University of Bergen https://hdl.handle.net/1956/6779 Copyright the author. All rights reserved Hydrate CO2 CH4 Exchange CO2-CH4 exchange Carbon Dioxide Methane Formation Salinity 752223 Master thesis 2013 ftunivbergen 2023-03-14T17:40:59Z Recent research activity has demonstrated the viability of producing methane from gas hydrate bearing sediments by injecting and sequestering CO2 in a process where CO2 replace methane in gas hydrate by a process called CO2 - CH4 exchange. The work presented in this thesis consist of a series of ten experiments designed to increase the basic knowledge of hydrate formation and subsequent methane production by CO2 - CH4 exchange in sandstone with emphasis on the effect of initial water saturation and brine salinity. Methane hydrate was formed at 8.3 MPa and 4 °C in ten partially saturated Bentheimer sandstone cores with varying initial water saturation and salinities. The hydrate formations were reproducible and showed a strong correlation between hydrate growth rate and both salinity and water saturation, where increased salinity or water saturation resulted in slower formation and more residual water. A correlation between initial growth rate and hydrate saturation were observed where the change in growth rate were proportional to the change in saturation. Hydrate bearing sandstone core plugs with high residual water saturation were successfully obtained by using initial water saturation above 0.6. CO2 - CH4 exchange was successfully performed on five hydrate bearing core plugs with different hydrate and water saturations. CO2 - CH4 exchange were performed by injecting liquid CO2 and a 75 mol% N2 + 25 mol% CO2 mix at a rate of 0.02 ml/min and measuring the effluent composition with a GC and, for some cores, the mass flow with a mass flow meter. The highest methane recovery from hydrate was estimated at 52%. Nitrogen was successfully used to dissolve plugging in two experiments without any resulting large scale dissociation. Co-injection of nitrogen and carbon dioxide showed excellent ability to hinder secondary hydrate formation during exchange without affecting the recovery. One experiment was conducted by performing repeated formations and dissociations on the same core. There was observed a significant ... Master Thesis Methane hydrate University of Bergen: Bergen Open Research Archive (BORA-UiB) |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Hydrate CO2 CH4 Exchange CO2-CH4 exchange Carbon Dioxide Methane Formation Salinity 752223 |
spellingShingle |
Hydrate CO2 CH4 Exchange CO2-CH4 exchange Carbon Dioxide Methane Formation Salinity 752223 Berge, Hans Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity |
topic_facet |
Hydrate CO2 CH4 Exchange CO2-CH4 exchange Carbon Dioxide Methane Formation Salinity 752223 |
description |
Recent research activity has demonstrated the viability of producing methane from gas hydrate bearing sediments by injecting and sequestering CO2 in a process where CO2 replace methane in gas hydrate by a process called CO2 - CH4 exchange. The work presented in this thesis consist of a series of ten experiments designed to increase the basic knowledge of hydrate formation and subsequent methane production by CO2 - CH4 exchange in sandstone with emphasis on the effect of initial water saturation and brine salinity. Methane hydrate was formed at 8.3 MPa and 4 °C in ten partially saturated Bentheimer sandstone cores with varying initial water saturation and salinities. The hydrate formations were reproducible and showed a strong correlation between hydrate growth rate and both salinity and water saturation, where increased salinity or water saturation resulted in slower formation and more residual water. A correlation between initial growth rate and hydrate saturation were observed where the change in growth rate were proportional to the change in saturation. Hydrate bearing sandstone core plugs with high residual water saturation were successfully obtained by using initial water saturation above 0.6. CO2 - CH4 exchange was successfully performed on five hydrate bearing core plugs with different hydrate and water saturations. CO2 - CH4 exchange were performed by injecting liquid CO2 and a 75 mol% N2 + 25 mol% CO2 mix at a rate of 0.02 ml/min and measuring the effluent composition with a GC and, for some cores, the mass flow with a mass flow meter. The highest methane recovery from hydrate was estimated at 52%. Nitrogen was successfully used to dissolve plugging in two experiments without any resulting large scale dissociation. Co-injection of nitrogen and carbon dioxide showed excellent ability to hinder secondary hydrate formation during exchange without affecting the recovery. One experiment was conducted by performing repeated formations and dissociations on the same core. There was observed a significant ... |
format |
Master Thesis |
author |
Berge, Hans |
author_facet |
Berge, Hans |
author_sort |
Berge, Hans |
title |
Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity |
title_short |
Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity |
title_full |
Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity |
title_fullStr |
Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity |
title_full_unstemmed |
Hydrate formation and CO2 - CH4 exchange in sandstone - An experimental study with emphasis on the role of initial brine saturation and salinity |
title_sort |
hydrate formation and co2 - ch4 exchange in sandstone - an experimental study with emphasis on the role of initial brine saturation and salinity |
publisher |
The University of Bergen |
publishDate |
2013 |
url |
https://hdl.handle.net/1956/6779 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://hdl.handle.net/1956/6779 |
op_rights |
Copyright the author. All rights reserved |
_version_ |
1766069003630936064 |