Ice clearing to support near-field operations
Ice management is an important consideration for any offshore petroleum operation conducted in an area that could encounter sea ice. Ice management could be performed for a number of reasons: to reduce global ice loads on the installation, to avoid ice interaction with underwater components such as...
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Format: | Article in Journal/Newspaper |
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Offshore Technology Conference
2018
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Online Access: | https://doi.org/10.4043/29110-MS https://nrc-publications.canada.ca/eng/view/object/?id=456f1d73-8160-483f-9a13-4d18cef38c48 https://nrc-publications.canada.ca/fra/voir/objet/?id=456f1d73-8160-483f-9a13-4d18cef38c48 |
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ftnrccanada:oai:cisti-icist.nrc-cnrc.ca:cistinparc:456f1d73-8160-483f-9a13-4d18cef38c48 2023-05-15T14:20:51+02:00 Ice clearing to support near-field operations Kennedy, Allison Harris, Trevor Reid, Veronica 2018-11-07 text https://doi.org/10.4043/29110-MS https://nrc-publications.canada.ca/eng/view/object/?id=456f1d73-8160-483f-9a13-4d18cef38c48 https://nrc-publications.canada.ca/fra/voir/objet/?id=456f1d73-8160-483f-9a13-4d18cef38c48 eng eng Offshore Technology Conference [Proceedings of OTC Arctic Technology Conference, 5-7 November, Houston, Texas, USA], OTC Arctic Technology Conference, November 01, 2018, Houston, Texas, USA, Publication date: 2018-11-07 doi:10.4043/29110-MS article 2018 ftnrccanada https://doi.org/10.4043/29110-MS 2021-09-01T06:16:51Z Ice management is an important consideration for any offshore petroleum operation conducted in an area that could encounter sea ice. Ice management could be performed for a number of reasons: to reduce global ice loads on the installation, to avoid ice interaction with underwater components such as risers or turrets, or to allow for close proximity operations such as loading / offloading, manning / de-manning, or evacuation in the case of an emergency event. The purpose of this project is to provide baseline information relating to ice clearing operations conducted in pack ice conditions. This information includes outcomes of different ice clearing operations in terms of loads on a GBS structure and ice concentration upstream of the GBS structure. It also includes loads measured on the support vessel that is conducting the ice clearing operations for a subset of the clearing techniques considered. To investigate this problem, model testing experiments were conducted in NRC-OCRE's ice tank located in St. John's NL, Canada. These experiments involved systematic testing involving various pack ice conditions representative of the Grand Banks area and two models: a support vessel and a GBS structure. The environmental conditions included: two ice concentrations, two ice piece sizes, and two ice piece drift speeds. Four ice clearing techniques were tested in each condition. The ice clearing techniques included two fixed position tests; where the support vessel was held in place upstream of the GBS using flexible mooring lines and two free running tests; where the support vessel was remotely controlled and maneuvered upstream of the GBS. Results are provided in terms of loads measured on the GBS model with clearing support, loads measured on the support vessel during the fixed ice clearing operations, ice free zones created upstream of the GBS and aft of the support vessel during ice clearing tests, reductions in GBS loads due to ice clearing operations, reductions in ice concentration upstream of the GBS due to ice clearing operations, and a summary of ice events that led to large pack ice loads. The significant factors that influenced each result were also identified. These results complement existing literature relating to physical ice clearing operations by providing the outcomes of systematic testing in different ice conditions which is available in public domain. These results could be used as benchmark values for design or numerical model validation. In addition, they could provide insight to operators, regulators and academia to support informed decision making regarding the level of ice management support required in different operating environments. All dimensions and test results in this paper are provided at full scale value. Peer reviewed: Yes NRC publication: Yes Article in Journal/Newspaper Arctic Sea ice National Research Council Canada: NRC Publications Archive Canada Day 2 Tue, November 06, 2018 |
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Open Polar |
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National Research Council Canada: NRC Publications Archive |
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ftnrccanada |
language |
English |
description |
Ice management is an important consideration for any offshore petroleum operation conducted in an area that could encounter sea ice. Ice management could be performed for a number of reasons: to reduce global ice loads on the installation, to avoid ice interaction with underwater components such as risers or turrets, or to allow for close proximity operations such as loading / offloading, manning / de-manning, or evacuation in the case of an emergency event. The purpose of this project is to provide baseline information relating to ice clearing operations conducted in pack ice conditions. This information includes outcomes of different ice clearing operations in terms of loads on a GBS structure and ice concentration upstream of the GBS structure. It also includes loads measured on the support vessel that is conducting the ice clearing operations for a subset of the clearing techniques considered. To investigate this problem, model testing experiments were conducted in NRC-OCRE's ice tank located in St. John's NL, Canada. These experiments involved systematic testing involving various pack ice conditions representative of the Grand Banks area and two models: a support vessel and a GBS structure. The environmental conditions included: two ice concentrations, two ice piece sizes, and two ice piece drift speeds. Four ice clearing techniques were tested in each condition. The ice clearing techniques included two fixed position tests; where the support vessel was held in place upstream of the GBS using flexible mooring lines and two free running tests; where the support vessel was remotely controlled and maneuvered upstream of the GBS. Results are provided in terms of loads measured on the GBS model with clearing support, loads measured on the support vessel during the fixed ice clearing operations, ice free zones created upstream of the GBS and aft of the support vessel during ice clearing tests, reductions in GBS loads due to ice clearing operations, reductions in ice concentration upstream of the GBS due to ice clearing operations, and a summary of ice events that led to large pack ice loads. The significant factors that influenced each result were also identified. These results complement existing literature relating to physical ice clearing operations by providing the outcomes of systematic testing in different ice conditions which is available in public domain. These results could be used as benchmark values for design or numerical model validation. In addition, they could provide insight to operators, regulators and academia to support informed decision making regarding the level of ice management support required in different operating environments. All dimensions and test results in this paper are provided at full scale value. Peer reviewed: Yes NRC publication: Yes |
format |
Article in Journal/Newspaper |
author |
Kennedy, Allison Harris, Trevor Reid, Veronica |
spellingShingle |
Kennedy, Allison Harris, Trevor Reid, Veronica Ice clearing to support near-field operations |
author_facet |
Kennedy, Allison Harris, Trevor Reid, Veronica |
author_sort |
Kennedy, Allison |
title |
Ice clearing to support near-field operations |
title_short |
Ice clearing to support near-field operations |
title_full |
Ice clearing to support near-field operations |
title_fullStr |
Ice clearing to support near-field operations |
title_full_unstemmed |
Ice clearing to support near-field operations |
title_sort |
ice clearing to support near-field operations |
publisher |
Offshore Technology Conference |
publishDate |
2018 |
url |
https://doi.org/10.4043/29110-MS https://nrc-publications.canada.ca/eng/view/object/?id=456f1d73-8160-483f-9a13-4d18cef38c48 https://nrc-publications.canada.ca/fra/voir/objet/?id=456f1d73-8160-483f-9a13-4d18cef38c48 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
[Proceedings of OTC Arctic Technology Conference, 5-7 November, Houston, Texas, USA], OTC Arctic Technology Conference, November 01, 2018, Houston, Texas, USA, Publication date: 2018-11-07 doi:10.4043/29110-MS |
op_doi |
https://doi.org/10.4043/29110-MS |
container_title |
Day 2 Tue, November 06, 2018 |
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