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Investigation of The Natural Convection Heat Transfer in Deep Wellbore

Ahmad Lukman, Muhammad Amirul Asri (2011) Investigation of The Natural Convection Heat Transfer in Deep Wellbore. Universiti Teknologi Petronas. (Unpublished)

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Abstract

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

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Energy - Air conditioning - Heat exchangers
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 30 Sep 2013 16:55
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/7493

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