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Discrepancy between measured dynamic poroelastic parameters and predicted values from Wyllie’s equation for water saturated Istebna sandstone

Knez Dariusz, Rajaoalison Herimitsinjo

Acta Geophysica

2021

Vol. 69, no. 2

673--680

The drilling-related geomechanics requires a better understanding of the encountered formation properties such as poroelastic parameters. This paper shows set of laboratory results of the dynamic Young’s modulus, Poisson’s ratio, and Biot’s coef fcient for dry and water-saturated Istebna sandstone samples under a series of confning pressure conditions at two diferent temperatures. The predicted results from Wyllie’s equation were compared to the measured ones in order to show the efect of saturation on the rock weakening. A negative correlation has been identifed between Poisson’s ratio, Biot’s coefcient and confning pressure, while a positive correlation between confning pressure and Young’s modulus. The predicted dynamic poroelastic rock properties using the P-wave value from Wyllie’s equation are diferent from measured ones. It shows the important infuence of water saturation on rock strength, which is confrmed by unconfned compressive strength measurement. Linear equations have been ftted for the laboratory data and are useful for the analysis of coupled stress and pore pressure efects in geomechanical problems. Such results are useful for many drilling applications especially in evaluation of such cases as wellbore instability and many other drilling problems.