Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region
Producing waxy oil in arctic area may cause wax deposited on the well wall. Since wax deposition is strongly thermal related, accurate heat transfer model is necessary in predicting and preventing wax depostion. A mathematical model was derived based on energy balances for heat exchange between the...
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/9842 2023-05-15T15:06:56+02:00 Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region Cui, Xiaoting Liang, Jenn-Tai Willhite, G. Paul Tsau, Jyun Syung 2012 139 pages http://hdl.handle.net/1808/9842 http://dissertations.umi.com/ku:12134 en eng University of Kansas http://dissertations.umi.com/ku:12134 http://hdl.handle.net/1808/9842 This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess Petroleum engineering Heat transfer Model Permafrost Wax deposition Wellbore Thesis 2012 ftunivkansas 2022-08-26T13:12:11Z Producing waxy oil in arctic area may cause wax deposited on the well wall. Since wax deposition is strongly thermal related, accurate heat transfer model is necessary in predicting and preventing wax depostion. A mathematical model was derived based on energy balances for heat exchange between the producing fluids and production string as well as the formation/permafrost. To simplify the calculation, oil and gas were assumed well mixed as one single-phase in the tubing. Furthermore, Singh's model for wax deposition was coupled with the heat transfer model. Wax concentration and effective diameter were updated with time in the temperature calculation. Pressure distribution was calculated over time to check whether the reservoir energy was sufficient to produce the oil during the production process. Besides, a user friendly GUI was developed by VB and MATLAB to run the simulation. The effects of permafrost, thermal insulation, well geometry and wax deposition on the heat transfer calculation were studied. Simulation results illustrated insulating the wellbore and evacuating the production casing annulus effectively reduced the wellbore heat loss. The model can be used in the temperature prediction of an injection well or production well in permafrost region or non-permafrost region. Thesis Arctic permafrost The University of Kansas: KU ScholarWorks Arctic |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
English |
topic |
Petroleum engineering Heat transfer Model Permafrost Wax deposition Wellbore |
spellingShingle |
Petroleum engineering Heat transfer Model Permafrost Wax deposition Wellbore Cui, Xiaoting Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region |
topic_facet |
Petroleum engineering Heat transfer Model Permafrost Wax deposition Wellbore |
description |
Producing waxy oil in arctic area may cause wax deposited on the well wall. Since wax deposition is strongly thermal related, accurate heat transfer model is necessary in predicting and preventing wax depostion. A mathematical model was derived based on energy balances for heat exchange between the producing fluids and production string as well as the formation/permafrost. To simplify the calculation, oil and gas were assumed well mixed as one single-phase in the tubing. Furthermore, Singh's model for wax deposition was coupled with the heat transfer model. Wax concentration and effective diameter were updated with time in the temperature calculation. Pressure distribution was calculated over time to check whether the reservoir energy was sufficient to produce the oil during the production process. Besides, a user friendly GUI was developed by VB and MATLAB to run the simulation. The effects of permafrost, thermal insulation, well geometry and wax deposition on the heat transfer calculation were studied. Simulation results illustrated insulating the wellbore and evacuating the production casing annulus effectively reduced the wellbore heat loss. The model can be used in the temperature prediction of an injection well or production well in permafrost region or non-permafrost region. |
author2 |
Liang, Jenn-Tai Willhite, G. Paul Tsau, Jyun Syung |
format |
Thesis |
author |
Cui, Xiaoting |
author_facet |
Cui, Xiaoting |
author_sort |
Cui, Xiaoting |
title |
Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region |
title_short |
Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region |
title_full |
Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region |
title_fullStr |
Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region |
title_full_unstemmed |
Wellbore Heat Transfer Model for Wax Deposition in Permafrost Region |
title_sort |
wellbore heat transfer model for wax deposition in permafrost region |
publisher |
University of Kansas |
publishDate |
2012 |
url |
http://hdl.handle.net/1808/9842 http://dissertations.umi.com/ku:12134 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_relation |
http://dissertations.umi.com/ku:12134 http://hdl.handle.net/1808/9842 |
op_rights |
This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author. openAccess |
_version_ |
1766338519908745216 |