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 coefficient for dry and water-saturated Istebna sandstone samples under a series of confining pressure conditions at two different temperatures. The predicted results from Wyllie’s equation were compared to the measured ones in order to show the effect of saturation on the rock weakening. A negative correlation has been identified between Poisson’s ratio, Biot’s coefficient and confining pressure, while a positive correlation between confining pressure and Young’s modulus. The predicted dynamic poroelastic rock properties using the P-wave value from Wyllie’s equation are different from measured ones. It shows the important influence of water saturation on rock strength, which is confirmed by unconfined compressive strength measurement. Linear equations have been fitted for the laboratory data and are useful for the analysis of coupled stress and pore pressure effects 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.

与钻井有关的地质力学要求更好地了解所遇到的地层特性，例如孔隙弹性参数。本文显示了一组在两个不同温度下在一系列围压条件下干燥和水饱和的Istebna砂岩样品的动态杨氏模量，泊松比和比奥系数的实验室结果。将Wyl​​lie方程的预测结果与测得的结果进行比较，以显示饱和度对岩石弱化的影响。泊松比，比奥系数与围压之间存在负相关，而围压与杨氏模量之间存在正相关。使用Wyllie方程的P波值预测的动态多孔弹性岩石特性与实测的不同。它显示了水饱和度对岩石强度的重要影响，这一点已通过无限制抗压强度测量得到了证实。线性方程式已经适合实验室数据，可用于分析地质力学问题中的应力和孔隙压力耦合效应。这样的结果对于许多钻井应用都是有用的，特别是在评估井眼失稳和许多其他钻井问题的情况下。