Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer
A transient fully coupled model is proposed to investigate the two-phase flow of CO2 and water-based fluid in a wellbore, considering the complex mass and heat transfer in different flow patterns and dynamic coupling between the wellbore and reservoir. Based on mass conservation, momentum, and energ...
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2021-01-01
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Series: | Geofluids |
Online Access: | http://dx.doi.org/10.1155/2021/8879205 |
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doaj-61a0290582a94482821190f5a618dca82021-03-29T00:09:21ZengHindawi-WileyGeofluids1468-81232021-01-01202110.1155/2021/8879205Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat TransferXinxin Zhao0Xiangzhen Yan1Xiaohui Sun2Qing Zhao3Hongwei Jiang4Yonghai Gao5Guang Yang6Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China))Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China))Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China))CNPC Engineering Technology R & D Company LimitedCNPC Engineering Technology R & D Company LimitedKey Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China))CNPC Engineering Technology R & D Company LimitedA transient fully coupled model is proposed to investigate the two-phase flow of CO2 and water-based fluid in a wellbore, considering the complex mass and heat transfer in different flow patterns and dynamic coupling between the wellbore and reservoir. Based on mass conservation, momentum, and energy balance, the model employs a state-of-the-art equation of state and transport models to analyze the variations of multiphase flow behaviors and CO2 properties in a wellbore. Applied in the scenario of a drilled gas kick, the proposed model is used to simulate the processes of gas migration and two-phase flow in the wellbore. The results indicate that the CO2 solubility increases gradually with the increment of depth, the trend of which shows an abrupt change in 500-1000 m due to the phase transition of CO2. During kick development, the fronts of free gas and dissolved gas increase almost linearly with time. Through a comparison of CO2 and CH4 kicks, gas dissolution is found to significantly suppress the development process of CO2 kick. The error in kick prediction can reach 42% if the effect of gas dissolution is neglected. However, it can be neglected for CH4 kick.http://dx.doi.org/10.1155/2021/8879205 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xinxin Zhao Xiangzhen Yan Xiaohui Sun Qing Zhao Hongwei Jiang Yonghai Gao Guang Yang |
spellingShingle |
Xinxin Zhao Xiangzhen Yan Xiaohui Sun Qing Zhao Hongwei Jiang Yonghai Gao Guang Yang Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer Geofluids |
author_facet |
Xinxin Zhao Xiangzhen Yan Xiaohui Sun Qing Zhao Hongwei Jiang Yonghai Gao Guang Yang |
author_sort |
Xinxin Zhao |
title |
Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer |
title_short |
Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer |
title_full |
Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer |
title_fullStr |
Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer |
title_full_unstemmed |
Modelling of Transient CO2/Water Flow in Wellbore considering Multiple Mass and Heat Transfer |
title_sort |
modelling of transient co2/water flow in wellbore considering multiple mass and heat transfer |
publisher |
Hindawi-Wiley |
series |
Geofluids |
issn |
1468-8123 |
publishDate |
2021-01-01 |
description |
A transient fully coupled model is proposed to investigate the two-phase flow of CO2 and water-based fluid in a wellbore, considering the complex mass and heat transfer in different flow patterns and dynamic coupling between the wellbore and reservoir. Based on mass conservation, momentum, and energy balance, the model employs a state-of-the-art equation of state and transport models to analyze the variations of multiphase flow behaviors and CO2 properties in a wellbore. Applied in the scenario of a drilled gas kick, the proposed model is used to simulate the processes of gas migration and two-phase flow in the wellbore. The results indicate that the CO2 solubility increases gradually with the increment of depth, the trend of which shows an abrupt change in 500-1000 m due to the phase transition of CO2. During kick development, the fronts of free gas and dissolved gas increase almost linearly with time. Through a comparison of CO2 and CH4 kicks, gas dissolution is found to significantly suppress the development process of CO2 kick. The error in kick prediction can reach 42% if the effect of gas dissolution is neglected. However, it can be neglected for CH4 kick. |
url |
http://dx.doi.org/10.1155/2021/8879205 |
work_keys_str_mv |
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