Visualização e analise do deslocamento imiscivel e instavel em meio poroso consolidado

AUTOR(ES)

Jose Adilson Tenorio Gomes

DATA DE PUBLICAÇÃO

1997

RESUMO

The main objective of this study is to investigate, at laboratory scale, the influence of both displacement velocity and mobility ratio on the relative permeability and geometry of two phase immiscible flow, in a naturally consolidated porous medium, in the presence of conate water saturation. The displacement experiments were carried out in cylindrical cores of the Berea and Botucatu sandstones. The mineral composition, pore geometry characterization and petrophysical properties of the porous medium were obtained using microcoscopic analysis, X-ray computerized tomography, minipermeametry analysis, and conventional petrophysics conventional tests. The preparation of samples and the displacement tests were performed according to standard procedures. The dynamic parameters of the flow were monitored and stored by an automatic computerized data acquisition system. The saturation distribution of the fluids was monitored using a high speed helical X-ray computer tomography scanning technique, which is appropriate even for high displacement velocities and long samples. New procedures for images processing were used to handle the great amount of tomography images acquired in each test. These procedures permitted a semi-automatic image reconstruction and calculation of displacement properties, which were impossible to be obtained with the available tools. The high leveI of details in the reconstructed images made possible a detailed qualitative and quantitative analysis of the flow conditions, allowing a precise determination of the spatial variation of fluids saturation, and the correct knowledge of the boundary conditions in each test step. Besides, simultaneous determination of fluid distributions and pressure along the sample at various displacement times permitted the establishment of a new reIative permeability analysis method, which is independent of flow stability conditions. The results showed that the flow stability limits, computed according to the traditional indexes, fail in displacement tests using naturally consolidated sands in the presence of conate water. Under these conditions, due to capillary effects, the numerous small fingers developed at the inlet, early in the displacement, merge to form only one finger that advances far into the sample until the break-through. A finite difference numerical simulator can be used as a good tool to match the test results, with appropriate boundary conditions and injection geometry, determined with the aid of images, and a correct permeability distribution, determined with the minipermeametry analysis

ASSUNTO(S)

tomografia computadorizada escoamento multifasico processamento de imagens permeabilidade reservatorios

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