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Distributed dynamics of influx during MPD operations : modelling and estimation

Abstract : While drilling an oil well, unwanted influx of fluids from the reservoir may occur. This manuscript studies the dynamics of the resulting fluid flow in the wellbore and the reservoir, during managed pressure drilling (MPD) operations. We study the phenomena using first-principle approach that leads to a modified two phase flow model called the drift-flux model (DFM). The model takes the form of a hyperbolic system of transport equations, whereas the reservoir pressure dynamics is given by a parabolic diffusion equation. We propose appropriate numerical schemes for both. Then, we propose different observer designs to estimate the influx from the reservoir into the wellbore. The observers for the coupled wellbore-reservoir system take different forms, as we combine the distributed and the reduced order models for each system. We propose to use the choke pressure as a measurement that is typically available on a MPD operational site, i.e. topside sensing. However, availability of the bottom hole pressure modifies the observer design, in ways we detail. We show convergence of the observers to the true values of reservoir pore pressure and influx, in each case.
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https://pastel.archives-ouvertes.fr/tel-03097348
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Submitted on : Tuesday, January 5, 2021 - 12:21:11 PM
Last modification on : Thursday, January 7, 2021 - 3:13:42 AM

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2020UPSLM018_archivage.pdf
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  • HAL Id : tel-03097348, version 1

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Naveen Velmurugan. Distributed dynamics of influx during MPD operations : modelling and estimation. Automatic. Université Paris sciences et lettres, 2020. English. ⟨NNT : 2020UPSLM018⟩. ⟨tel-03097348⟩

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