Modelagem numérica do escoamento multifásico transiente composicional em poços de petróleo usando modelo de dois fluidos
Transient multiphase flow in pipes is a common phenomenon in chemical, nuclear and petroleum industries. Numerical simulation of multiphase flow in pipes is an essential tool for economic and safety analysis related to design and management of production and exploration projects. In this work, we...
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| Formato: | doctoralThesis |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25240 |
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| Resumo: | Transient multiphase flow in pipes is a common phenomenon in chemical, nuclear and
petroleum industries. Numerical simulation of multiphase flow in pipes is an essential tool for
economic and safety analysis related to design and management of production and exploration
projects. In this work, we propose a fully-implicit numerical solution for a transient compositional
two-phase flow in a wellbore using two-fluid model. The system of governing equations
consists of mass balance equations for each component, one energy equation for mixture, and
one momentum equation for each phase. In addition to the conservation equations, thermodynamic
equilibrium equations and constraint equations (mole fraction of all components in
each phase and sum of volume fractions) are considered. The thermodynamic properties of
the hydrocarbons, stability and flash calculations are obtained by using the Peng-Robinson cubic
equation of state. The one-dimensional governing equations are discretized by means of
finite volume method considering staggered grid scheme. The first order upwind is used to
evaluate mass, momentum and energy at the control volume faces. The first order implicit Euler
method is applied for temporal discretization. The resulting system of nonlinear algebraic
equations is solved simultaneously by using a fully implicit Newton-Raphson method. Finally,
a detailed verification of the proposed solutions were performed by comparing the obtained numerical
results to reference and commercial simulators. In addition, a reference solution for the
frictionless phase segregation benchmark problem was proposed and compared to numerical
solutions. |
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