Modelo composicional de reservatorios com formulação totalmente implicita

AUTOR(ES)
DATA DE PUBLICAÇÃO

1990

RESUMO

This work describes an isotermal and two-dimensional fully implicit compositional model, which has been developed to the moddelling of retrograde gas condensate and volatile oil reservoirs. The model considers oil, gas and water phases, and may be applied to either cartesian (x-y) or cylindrical (r-z) grids. Water is considered to be immobile and slightly compressible, and water saturation is a function of pressure. Thermodynamic equilibrium is also considered, with no water dissolved in the hydrocarbon phases and no hydrocarbon dissolved in the water phase. Fluid-rock iteractions have not been considered. Phase equilibrium and fluid properties have been computed by means of the Peng-Robinson (1976) equation of state. The adjustable coefficients of the equation of state have been previously determined by means of a comercial PVT simulator. The Newton-Raphson method has been selected to solve the resulting highly non-linear problem. The block penta-diagonal matrix has been directly solved by Gaussian elimination, which takes advantage of the matrix sparcity. Due to the problem complexity, the validation of the model has been provided to the steady-state flow case, which presents a known analytical solution for composition and saturations. Examples of application of the computer model to depletion studies, gas cycling and well testing are presented

ASSUNTO(S)

petroleo - reservas engenharia do petroleo engenharia mecanica

ACESSO AO ARTIGO

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