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Investigation of The Natural Convection Heat Transfer in Deep Wellbore

Radial heat transfer between the inner pipe fluid flow and the formation surrounding the oil wells occurs by overcoming various resistances in series. The major resistance is within the annular space between the wellbore tubing and the casing. The present work aims to predict the natural convecti...

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Main Author: Ahmad Lukman, Muhammad Amirul Asri
Format: Final Year Project
Language:English
Published: Universiti Teknologi Petronas 2011
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://utpedia.utp.edu.my/7493/1/2011%20-%20Investigation%20of%20the%20natural%20convection%20heat%20transfer%20in%20deep%20weelbore.pdf
http://utpedia.utp.edu.my/7493/
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spelling my-utp-utpedia.74932017-01-25T09:42:04Z http://utpedia.utp.edu.my/7493/ Investigation of The Natural Convection Heat Transfer in Deep Wellbore Ahmad Lukman, Muhammad Amirul Asri TJ Mechanical engineering and machinery Radial heat transfer between the inner pipe fluid flow and the formation surrounding the oil wells occurs by overcoming various resistances in series. The major resistance is within the annular space between the wellbore tubing and the casing. The present work aims to predict the natural convection heat transfer coefficient in the annulus, which is hard to predict due to the large length-to-spacing ratio (aspect ratio). The approach to model natural convection heat transfer in this work is by analytical and numerical teclmiques. The annular space between the tubing and the casing is treated as a finite space bounded by walls and filled with fluid media (enclosures). Natural convection in such enclosures occurs as a result of buoyancy caused by a body force field with density variations within the annulus field. Correlations for inclined rectangular enclosures will be employed in the study. The flow field of such a case will be modeled and simulated for numerical analysis, using ANSYS-FLUENT- 12 software package. Some boundary parameters have been defined by the user and fed to the software. In order to verify the results, the predicted Nusselt numbers from both, analytical and numerical will be compared. The method of analysis is done first by doing the analytical simulation of the Nusselt correlation found in literature and comparing the result done in numerical analysis. Numerical simulation is then continued with various operational conditions and the analysis of the results. The variables interested are the difference of temperature between tubing and casing, density of air, velocity of air, and the Nusselt Number. The new functional correlations cover a wide range of oil well inclination angles. In terms of combined accuracy and continuity, these new functional correlations offer advantages in certain applications over those previously employed. As heat transfer is concerned, the convection heat transfer is the highest at the bottom of the long annulus. Comparing the analytical and numerical simulation, the difference is still clear that the theoretical analysis of the existing correlation does not agree with the numerical simulation. As a conclusion, the behavior of the natural convection heat transfer is better observed in the detail of the numerical simulation. Keywords: Heat transfer Natural convection Casing annulus Numerical analysis Oil wells Universiti Teknologi Petronas 2011-05 Final Year Project NonPeerReviewed application/pdf en http://utpedia.utp.edu.my/7493/1/2011%20-%20Investigation%20of%20the%20natural%20convection%20heat%20transfer%20in%20deep%20weelbore.pdf Ahmad Lukman, Muhammad Amirul Asri (2011) Investigation of The Natural Convection Heat Transfer in Deep Wellbore. Universiti Teknologi Petronas. (Unpublished)
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Electronic and Digitized Intellectual Asset
url_provider http://utpedia.utp.edu.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Ahmad Lukman, Muhammad Amirul Asri
Investigation of The Natural Convection Heat Transfer in Deep Wellbore
description Radial heat transfer between the inner pipe fluid flow and the formation surrounding the oil wells occurs by overcoming various resistances in series. The major resistance is within the annular space between the wellbore tubing and the casing. The present work aims to predict the natural convection heat transfer coefficient in the annulus, which is hard to predict due to the large length-to-spacing ratio (aspect ratio). The approach to model natural convection heat transfer in this work is by analytical and numerical teclmiques. The annular space between the tubing and the casing is treated as a finite space bounded by walls and filled with fluid media (enclosures). Natural convection in such enclosures occurs as a result of buoyancy caused by a body force field with density variations within the annulus field. Correlations for inclined rectangular enclosures will be employed in the study. The flow field of such a case will be modeled and simulated for numerical analysis, using ANSYS-FLUENT- 12 software package. Some boundary parameters have been defined by the user and fed to the software. In order to verify the results, the predicted Nusselt numbers from both, analytical and numerical will be compared. The method of analysis is done first by doing the analytical simulation of the Nusselt correlation found in literature and comparing the result done in numerical analysis. Numerical simulation is then continued with various operational conditions and the analysis of the results. The variables interested are the difference of temperature between tubing and casing, density of air, velocity of air, and the Nusselt Number. The new functional correlations cover a wide range of oil well inclination angles. In terms of combined accuracy and continuity, these new functional correlations offer advantages in certain applications over those previously employed. As heat transfer is concerned, the convection heat transfer is the highest at the bottom of the long annulus. Comparing the analytical and numerical simulation, the difference is still clear that the theoretical analysis of the existing correlation does not agree with the numerical simulation. As a conclusion, the behavior of the natural convection heat transfer is better observed in the detail of the numerical simulation. Keywords: Heat transfer Natural convection Casing annulus Numerical analysis Oil wells
format Final Year Project
author Ahmad Lukman, Muhammad Amirul Asri
author_facet Ahmad Lukman, Muhammad Amirul Asri
author_sort Ahmad Lukman, Muhammad Amirul Asri
title Investigation of The Natural Convection Heat Transfer in Deep Wellbore
title_short Investigation of The Natural Convection Heat Transfer in Deep Wellbore
title_full Investigation of The Natural Convection Heat Transfer in Deep Wellbore
title_fullStr Investigation of The Natural Convection Heat Transfer in Deep Wellbore
title_full_unstemmed Investigation of The Natural Convection Heat Transfer in Deep Wellbore
title_sort investigation of the natural convection heat transfer in deep wellbore
publisher Universiti Teknologi Petronas
publishDate 2011
url http://utpedia.utp.edu.my/7493/1/2011%20-%20Investigation%20of%20the%20natural%20convection%20heat%20transfer%20in%20deep%20weelbore.pdf
http://utpedia.utp.edu.my/7493/
_version_ 1739831470566932480
score 13.211869

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