Preliminary study on non-liner interpretation of biot coefficient of rock and its application on the analysis of wellbore stability

The Biot coefficient has an important application value on the drilling engineering fracturing engineering.The equation, which is used for the log interpretation of Biot coefficient, is dependent on all-wave logging,so its spread is limited. Based on the results of core tests,taking the deformation mechanism of grain-rock and chemical crystallized rock,the interpretation method for Biot coefficient is presented utilizing the broad sense Usher model, and the profiles of rock mechanics and in-situ stress parameters calculated by this model are coincident with the drilling data based on the log data. That means, this model is valuable for spreading application.