The article discusses methods for modeling the stress-strain state of rocks to address the problem of wellbore instability during drilling. Special attention is given to triaxial independent loading of rocks using a laboratory setup, as well as the modeling of uniaxial and triaxial compression using the ANSYS Workbench software. These methods enable to precisely analyze rock behavior under load, simulating real drilling conditions. Experiments showed that in areas with dolomite inclusions in argillite, stress levels significantly increase, which can lead to the formation of fractures, drilling fluid loss and rock collapse in inclined wellbores. The application of these methods helps identify and predict potential complications during the design phase, enhancing wellbore stability and reducing the risk of failures. As a result of the modeling, an integrated solution was developed, providing recommendations for selecting drilling fluid components based on the analysis of the physical and mechanical properties of rocks, such as Poisson’s ratio and Young’s modulus. This comprehensive approach significantly improves the efficiency and safety of drilling operations, particularly in wells with complex trajectories or deep formations, where preventing complications during the design phase proves to be more cost-effective than addressing them during the construction process. This technical approach contributes to optimizing wellbore design and mitigating risks, ensuring more reliable and economically feasible drilling projects.
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