Investigating the Influence of Reservoir Pressure on Porous Media Permeability: A Case Study of Fields in the Perm Region

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Abstract

Field studies of permeability changes were analyzed using the example of oil fields in the Perm Krai; laboratory studies of the effect of effective pressure on core permeability were carried out. An analysis of existing methods for assessing changes in rock permeability depending on effective pressure showed that in most cases, researchers use empirical dependencies obtained by approximating experimental data. Analysis of the results of laboratory studies showed that, regardless of the type of rock, the greatest decrease in permeability during elastic deformations was observed in highly permeable samples of limestone and sandstone and was amounted to up to 20%. It was established that the dependences of the permeability of limestone and sandstone samples under purely elastic deformations ware described with high accuracy by exponential equations. The calculated coefficients of the equations describing the change in permeability were compared based on the results of field and laboratory studies. The mechanism of deterioration in the permeability of productive formations with a decrease in reservoir pressure was revealed, on the basis of which a model is proposed that takes into account elastic and plastic deformations of porous reservoirs. It was established that highly permeable formations were most susceptible to plastic deformation with the formation of deformation bands. In layers with greater thickness, the probability of a decrease in permeability with a drop in reservoir pressure increased, which was associated with the formation of transverse deformation bands.

Keywords

permeabilityporosityeffective pressurereservoir deformationcorewell productivitypore pressuredeformation bandspore reservoirbottomhole formation zone

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Article information

Published
28 June 2024
Issue date
28 June 2024
Issue
Vol. 24, No. 2 (2024)
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