Determination of Clayey Reservoir Rock Properties at Various Stages of Oil Field Development

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Abstract

The article describes the issue of determining the properties of rocks with different fluid saturation and the relationship between changes in these properties from the stage of oil field development. The mineral composition of the studied clayey samples of oil reservoir rocks was given. The process of changes in the strength and elastic properties of the rock due to different saturation with kerosene and water was described. The dependences of the ultimate strength under uniaxial compression, elastic modulus and Poisson's ratio for rocks of different fluid saturation were presented. The decrease in the strength and elastic modulus of rock samples with complete replacement of kerosene with water reached 15-20%, and in comparison with the results obtained for a sample in an air-dry state, the decrease in these same properties reached 30-40%. Based on the theoretical and practical studies the need to determine the strength and elastic properties of rocks depending on saturation in real field conditions became obvious. The results of filtration studies for clay rock samples were presented. It was established that a decrease in reservoir pressure contributed to an irreversible decrease in the permeability of the studied clayey rocks. It followed that the introduction of systems for maintaining reservoir pressure must be carried out as early as possible. An example of calculating relative permeability, pressure distribution in the reservoir at a constant flow rate was given, graphs of the distribution of the water/oil displacement front were constructed by year of field development with a plane-radial inflow into the well. The dependences of the elastic capacity coefficient and piezoelectric conductivity of the rock on fluid saturation were presented. The obtained results and the established dependencies are recommended to be used when predicting changes in the strength, elasticity and filtration-capacitive properties of pore-type clay rocks at various stages of oil field development, including for planning well treatment.

Keywords

effective pressurereservoir pressurerock pressureporositypermeabilitypiezoelectric conductivitysaturationwater cutfiltrationdeformationstrength propertieselastic propertieselasticity modulusPoisson's ratiouniaxial compressionBuckley-Leverett function

Bibliography

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Article information

Published
31 March 2024
Issue date
31 March 2024
Issue
Vol. 24, No. 1 (2024)
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