Hydrate plug formation risk with varying watercut and inhibitor concentrations
Hydrate formation introduces a potential operating and safety hazard in subsea oil and gas pipelines. The aggregation and deposition of hydrate particles together increase the resistance-to-flow in the pipeline, which dissipates the energy available to transport the resource and may even lead to a p...
Published in: | Chemical Engineering Science |
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Language: | English |
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Online Access: | http://hdl.handle.net/10203/195584 https://doi.org/10.1016/j.ces.2015.01.016 |
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ftkoasas:oai:koasas.kaist.ac.kr:10203/195584 2023-05-15T17:12:07+02:00 Hydrate plug formation risk with varying watercut and inhibitor concentrations Sohn, YH Sohn, Young Hoon Kim, J Kim, Jakyung Shin, K Shin, Kyuchul Chang, DJ Chang, Dae-Jun Seo, YT Seo, Yu-Taek Aman, ZM Aman, Zachary M. May, EF May, Eric F. 201504 http://hdl.handle.net/10203/195584 https://doi.org/10.1016/j.ces.2015.01.016 ENG eng PERGAMON-ELSEVIER SCIENCE LTD METHANE HYDRATE; OIL EMULSIONS; CARBON-DIOXIDE; NATURAL-GAS; SYSTEMS; STATE; PERFORMANCE; MECHANISM; INVERSION; FLOWLOOP ARTICLE A 2015 ftkoasas https://doi.org/10.1016/j.ces.2015.01.016 2015-07-30T23:59:23Z Hydrate formation introduces a potential operating and safety hazard in subsea oil and gas pipelines. The aggregation and deposition of hydrate particles together increase the resistance-to-flow in the pipeline, which dissipates the energy available to transport the resource and may even lead to a plug that blocks flow completely. The effects of 20-100% watercut and hydrate thermodynamic and kinetic inhibitors on both hydrate growth rate and resistance-to-flow have been studied in a high-pressure autoclave apparatus. The highest resistance-to-flow was observed for systems with around 60% watercut, for which oil-continuous condition existed for the majority of the hydrate growth period with free water available to bind both hydrate aggregates and deposits. Severe and periodic local maxima in the torque required to maintain a constant rotational speed were repeatedly observed in the autoclave at 60% watercut; these could be partially suppressed by adding 10 wL% MEG to the water phase. The resistance-to-flow signal was fully suppressed in two system configurations: (i) 10 wt% MEG with 0.5 wt% of PVCap, a hydrate kinetic inhibitor; and (ii) 30 wt% MEG. The results suggest that the injection of a thermodynamic inhibitor at less than 25% of the full inhibition requirement could be sufficient to alleviate the risk of a hydrate blockage. A simple model to describe hydrate growth in water- and oil-continuous systems was successfully deployed to predict hydrate growth rate in systems with varying watercut, with and without inhibitor. Article in Journal/Newspaper Methane hydrate Korea Advanced Institute of Science and Technology: KOASAS - KAIST Open Access Self-Archiving System Chemical Engineering Science 126 711 718 |
institution |
Open Polar |
collection |
Korea Advanced Institute of Science and Technology: KOASAS - KAIST Open Access Self-Archiving System |
op_collection_id |
ftkoasas |
language |
English |
topic |
METHANE HYDRATE; OIL EMULSIONS; CARBON-DIOXIDE; NATURAL-GAS; SYSTEMS; STATE; PERFORMANCE; MECHANISM; INVERSION; FLOWLOOP |
spellingShingle |
METHANE HYDRATE; OIL EMULSIONS; CARBON-DIOXIDE; NATURAL-GAS; SYSTEMS; STATE; PERFORMANCE; MECHANISM; INVERSION; FLOWLOOP Sohn, YH Sohn, Young Hoon Kim, J Kim, Jakyung Shin, K Shin, Kyuchul Chang, DJ Chang, Dae-Jun Seo, YT Seo, Yu-Taek Aman, ZM Aman, Zachary M. May, EF May, Eric F. Hydrate plug formation risk with varying watercut and inhibitor concentrations |
topic_facet |
METHANE HYDRATE; OIL EMULSIONS; CARBON-DIOXIDE; NATURAL-GAS; SYSTEMS; STATE; PERFORMANCE; MECHANISM; INVERSION; FLOWLOOP |
description |
Hydrate formation introduces a potential operating and safety hazard in subsea oil and gas pipelines. The aggregation and deposition of hydrate particles together increase the resistance-to-flow in the pipeline, which dissipates the energy available to transport the resource and may even lead to a plug that blocks flow completely. The effects of 20-100% watercut and hydrate thermodynamic and kinetic inhibitors on both hydrate growth rate and resistance-to-flow have been studied in a high-pressure autoclave apparatus. The highest resistance-to-flow was observed for systems with around 60% watercut, for which oil-continuous condition existed for the majority of the hydrate growth period with free water available to bind both hydrate aggregates and deposits. Severe and periodic local maxima in the torque required to maintain a constant rotational speed were repeatedly observed in the autoclave at 60% watercut; these could be partially suppressed by adding 10 wL% MEG to the water phase. The resistance-to-flow signal was fully suppressed in two system configurations: (i) 10 wt% MEG with 0.5 wt% of PVCap, a hydrate kinetic inhibitor; and (ii) 30 wt% MEG. The results suggest that the injection of a thermodynamic inhibitor at less than 25% of the full inhibition requirement could be sufficient to alleviate the risk of a hydrate blockage. A simple model to describe hydrate growth in water- and oil-continuous systems was successfully deployed to predict hydrate growth rate in systems with varying watercut, with and without inhibitor. |
format |
Article in Journal/Newspaper |
author |
Sohn, YH Sohn, Young Hoon Kim, J Kim, Jakyung Shin, K Shin, Kyuchul Chang, DJ Chang, Dae-Jun Seo, YT Seo, Yu-Taek Aman, ZM Aman, Zachary M. May, EF May, Eric F. |
author_facet |
Sohn, YH Sohn, Young Hoon Kim, J Kim, Jakyung Shin, K Shin, Kyuchul Chang, DJ Chang, Dae-Jun Seo, YT Seo, Yu-Taek Aman, ZM Aman, Zachary M. May, EF May, Eric F. |
author_sort |
Sohn, YH Sohn, Young Hoon |
title |
Hydrate plug formation risk with varying watercut and inhibitor concentrations |
title_short |
Hydrate plug formation risk with varying watercut and inhibitor concentrations |
title_full |
Hydrate plug formation risk with varying watercut and inhibitor concentrations |
title_fullStr |
Hydrate plug formation risk with varying watercut and inhibitor concentrations |
title_full_unstemmed |
Hydrate plug formation risk with varying watercut and inhibitor concentrations |
title_sort |
hydrate plug formation risk with varying watercut and inhibitor concentrations |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2015 |
url |
http://hdl.handle.net/10203/195584 https://doi.org/10.1016/j.ces.2015.01.016 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_doi |
https://doi.org/10.1016/j.ces.2015.01.016 |
container_title |
Chemical Engineering Science |
container_volume |
126 |
container_start_page |
711 |
op_container_end_page |
718 |
_version_ |
1766068885645164544 |