Banca de DEFESA: JULIO CESAR SANTOS NASCIMENTO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JULIO CESAR SANTOS NASCIMENTO
DATA : 23/10/2017
HORA: 15:00
LOCAL: SALA DE REUNIÕES DO CTEC (312)
TÍTULO:

NUMERICAL MODELING OF TRANSIENT COMPOSITIONAL MULTIPHASE FLOW IN WELLBORES USING TWO-FLUID MODEL

PALAVRAS-CHAVES:

Multiphase flow; transient compositional wellbore simulator; Two-Fluid Model; fully-implicit solution;  phase segregation problem

PÁGINAS: 175
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

Transient multiphase flow in pipes is a common phenomenon in chemical, nuclear and petroleum industries. In the petroleum industry, multiphase flow occurs due vaporization of the lighter components in the liquid hydrocarbon mixture during pressure and temperature depletion. The 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 co-current and counter-current flows in a wellbore using Two-Fluid Model. The system of governing equations consists of mass balance equations form each component, one total energy equation for all phases, one momentum equations for each phase. In addition to the differential equations, there also algebraic constraints, which are given by thermodynamic equilibrium equations, sum of the mole fraction of all the components for each phase and sum of volume fraction. The thermodynamic properties of the hydrocarbons, stability and flash calculations are obtained by using the Peng-Robinson cubic equation of state. In addition, a fully-implicit numerical solution for the Single-Pressure Two-fluid Model (SPM-4) was derived.  The one-dimensional governing equations are discretized by means of finite volume method considering staggered grids 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 non-linear algebraic system of equations is solved simultaneously by using a fully implicit Newton-Raphson. Finally, the numerical results obtained by proposed solutions were compared with reference and commercial simulator solutions allowed a detailed verification of the proposed fully-implicit solutions. In addition, a reference solutions for the frictionless phase segregation benchmark problem was proposed and compared with numerical solutions.

MEMBROS DA BANCA:
Externo à Instituição - ADOLFO PUIME PIRES - UENF
Presidente - 1288120 - ADRIANO DOS SANTOS
Externo à Instituição - BENNO WALDEMAR ASSMANN - PETROBRAS
Externo à Instituição - CARLOS ENRIQUE PICO ORTIZ - UENF
Externo ao Programa - 1646718 - SIDARTA ARAUJO DE LIMA