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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Development of a Transient Model for Fluid Flow, Heat Transfer and Pressure Buildup in Wellbores
Submission Author:
Ianto Martins , SC
Co-Authors:
Ianto Martins, Arthur Pandolfo da Veiga, Eduardo Bader Dalfovo Mohr Alves, Jader Riso Barbosa Jr.
Presenter: Ianto Martins
doi://10.26678/ABCM.ENCIT2020.CIT20-0367
Abstract
Annular Pressure Buildup (APB) can occur in most operating wellbores in the presence of a thermal gradient in the adjacent formation. It is defined as the pressure increase caused by the annular fluid thermal expansion in sealed annuli. The present work presents a fully coupled thermo-hydraulic model to estimate temperature and pressure profiles inside a well, as well as estimating the pressure buildup inside each annulus. The model consists of one momentum balance differential equation for each fluid layer, one energy balance differential equation for each vertical layer, be it fluid or not, as well as an equation system to determine the structural deformation of the well and the calculation of the APB itself. All the equations were discretized using the finite difference model, implemented on the Python 3 language and solved with a builtin package. A production wellbore was simulated, for the period of 10 days and the APB calculated for this period of time was 40 MPa, highlighting the necessity of a computational tool to estimate the scale of the phenomenon.
Keywords
transient, Heat transfer, Numeric method, Wellbore, annular pressure buildup
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