Evolution of Geomechanical and Electro-Hydrodynamic Fields in Deep Well Drilling in Rocks

摘要

The authors have developed and numerically implemented 3D model of evolution of geomechanical and hydrodynamic fields during deep'well drilling. The modeling exercises showed low-permeable zones of irreversible deformations that appear under definitely interrelated rock strength properties, drilling mud pressure and in situ horizontal stresses in the borehole environment. These low-permeable irreversible-deformation zones give rise to angular anisotropy of distribution of water content and drilling mud resistivity in the invaded zone, which greatly affects geophysical logging data and must be taken into account in the logging data inversion.