Representação de mistura de petróleos com abordagem composicional / Representation of petroleum mixture with composicional approach

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

02/08/2012

RESUMO

In recent years, with the increasing complexity of production projects requires that the numerical flow simulators are able to simulate new situations and production scenarios. In the case of convergence points where two or more fluids with different characterizations are mixed and represented by a compositional approach, the numerical representation it becomes difficult to describe an approach when compared to Black-oil, because unlike the Black-oil treatment, there is not only a difference of inlet pressures to be addressed, but there are also issues related to the definition of the resulting composition. The representation of the resulting mixture (setting of the components and their properties) directly affects the prediction of the phase behavior in a simulation. A careful way to represent the resulting mixture is through experimental PVT (pressurevolume- temperature analysis) data, from an oil or gas, adjusted to a cubic equation of state. But with the difficulty of obtaining these data and their common absence, it is advisable to work with the data of each fluid, according to some methods for adjusting the mixture, available in the literature. However, due to the variation of the input current over time, at the convergence point, it is necessary a new adjust every time step, which in practice would make the simulation impracticable over time. Thus, it is necessary to use a method that automates the adjustment of the equation of state within the simulator routine. The solution employed in several commercial software is to use as input data the equations of state previously adjusted to each fluid upstream and recalculate the thermodynamic properties of the resulting mixture equation of state by using mixing rules. This paper aims to describe the adjust of an equation of state with the use of mixing rules, to represent a mixture of two oils in order to evaluate the use of alternative combination rules for mixing fluids in a numerical simulation flow with compositional approach. The solution was compared with two other mixtures adjustment techniques such as: weaved and splitting.

ASSUNTO(S)

engenharia do petróleo equações de estado petroleum engineering equation of state

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