Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature
Production in reservoirs located in deep and ultra-deep water that contain waxy crude oils faces a huge obstacle imposed by the low temperatures of the environment. When the waxy crude oil is subjected to a temperature below the Gelation Temperature, as in the case investigated in the present work,...
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2013-12-01
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Online Access: | https://doi.org/10.3933/applrheol-23-62798 |
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doaj-a86af991384e450f87036a6d1b2c7df02021-09-06T19:41:55ZengDe GruyterApplied Rheology1617-81062013-12-0123610.3933/applrheol-23-62798Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress NatureSoares Edson J.0Thompson Roney L.1Machado Andre2LabReo, Department of Mechanical Engineering, Universidade Federal do Espirito Santo, Avenida Fernando Ferrari, 514, 29075-910,Vitoria, ES, BrazilLMTA, Department of Mechanical Engineering (PGMEC), Universidade Federal Fluminense, Rua Passo da Patria 156, 24210-240,Niteroi, RJ, BrazilUO-ES, ENGP, EES, PETROBRAS, Avenida Nossa Senhora da Penha 1688, 29057-550,Vitoria, ES, BrazilProduction in reservoirs located in deep and ultra-deep water that contain waxy crude oils faces a huge obstacle imposed by the low temperatures of the environment. When the waxy crude oil is subjected to a temperature below the Gelation Temperature, as in the case investigated in the present work, it exhibits a variety of non- Newtonian features: elasticity, plasticity, viscous effects, and time-dependency, which renders to this material a highly complex behavior. A crucial feature that is frequently ignored when the determination of the yield stress is being carried out, is the time-dependency nature of these materials. We demonstrate how significantly different values of yield stress can be obtained if this character of the material is neglected. We use the asphaltenes properties as inhibitors of wax formation and propose a protocol to capture yield-stress parameters. One important conclusion is that waxy crude oils can be classified as apparent-yield-stress fluids, and not (true-) yieldstress materials, with the presence of a dynamic and a static yield-stresses.https://doi.org/10.3933/applrheol-23-62798waxy crude oilsre-start problemyield stress measurementtime-dependent materialwax formation inhibitors |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Soares Edson J. Thompson Roney L. Machado Andre |
spellingShingle |
Soares Edson J. Thompson Roney L. Machado Andre Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature Applied Rheology waxy crude oils re-start problem yield stress measurement time-dependent material wax formation inhibitors |
author_facet |
Soares Edson J. Thompson Roney L. Machado Andre |
author_sort |
Soares Edson J. |
title |
Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature |
title_short |
Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature |
title_full |
Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature |
title_fullStr |
Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature |
title_full_unstemmed |
Measuring the Yielding of Waxy Crude Oils Considering its Time-Dependency and Apparent-Yield-Stress Nature |
title_sort |
measuring the yielding of waxy crude oils considering its time-dependency and apparent-yield-stress nature |
publisher |
De Gruyter |
series |
Applied Rheology |
issn |
1617-8106 |
publishDate |
2013-12-01 |
description |
Production in reservoirs located in deep and ultra-deep water that contain waxy crude oils faces a huge obstacle imposed by the low temperatures of the environment. When the waxy crude oil is subjected to a temperature below the Gelation Temperature, as in the case investigated in the present work, it exhibits a variety of non- Newtonian features: elasticity, plasticity, viscous effects, and time-dependency, which renders to this material a highly complex behavior. A crucial feature that is frequently ignored when the determination of the yield stress is being carried out, is the time-dependency nature of these materials. We demonstrate how significantly different values of yield stress can be obtained if this character of the material is neglected. We use the asphaltenes properties as inhibitors of wax formation and propose a protocol to capture yield-stress parameters. One important conclusion is that waxy crude oils can be classified as apparent-yield-stress fluids, and not (true-) yieldstress materials, with the presence of a dynamic and a static yield-stresses. |
topic |
waxy crude oils re-start problem yield stress measurement time-dependent material wax formation inhibitors |
url |
https://doi.org/10.3933/applrheol-23-62798 |
work_keys_str_mv |
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