Analise critica dos metodos de mudança de escala associados a simulação de reservatorios

AUTOR(ES)
DATA DE PUBLICAÇÃO

1991

RESUMO

New geoestatistical techniques allow us to use a great number of information to model petroleum reservoirs. However, in order to bonor the variability of tbe modelled properties, tbe reservoir discretization requires a grid toa refined to be directly used in a flow simulator. Therefore, a cbange of scale is needed, from tbe geoestatistical grid to tbe flow simulator grid. It is necessary to calculate representative values for the coarse grid-blocks, using the values of the fine grid-blocks. In this work, the major scaling-up metbods for tbe most important properties used in a flow simulation were selected from tbe literature, explained, commented and compared. Three different geological and geoestatistical models were used. The accuracy and the performance of the methods were verified through the comparison between the flow simulation results using fine and coarse grid. This work was divided in two parts. The first one relates to single-pbase flow problems, wbere the properties to be scaled are, basically, tbe porosity and tbe absolute permeability, and it was found that the Le Loc h s (1990) analytical method yields good results. In the second part, four different physical problems of multi-pbase flow were selected. In addition to tbe previous properties, relative permeabilities and cappilary pressure were scaled-up, using dynamic pseudofunctions. The results for the 12 cases (3 geoestatistical models and 4 physical problems) sbowed tbat the pseudofunctions must always be used, but they work better wben fingering effects are smaller

ASSUNTO(S)

engenharia do petroleo petroleo - reservas

ACESSO AO ARTIGO

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