Issue: 10 , Volume: 66 , Уear of publication: 2025

Drilling fluid containing a solid dispersed phase penetrates into the surrounding rocks when drilling wells. A colmatation zone may form depending on the size ratio of clay particles (cuttings) and pores, which leads to a significant change in the transport and electrical characteristics of the near-wellbore space. The latter are especially important for reliable interpretation of well logging data, since a directional change in the pore space structure can cause anisotropy of physical properties of the rock. The colmatation process is irreversible and almost irreproducible in laboratory conditions. Its study is based on numerical experiments aimed at analyzing physical characteristics of sedimentary rock samples (sandstones) using their digital models. This article considers the the problem of calculating their effective tensor of specific electrical conductivity at different volumetric saturation of the pore space with clay-based drilling mud, formation water and oil. The effect of the volume content of the indicated phases on the anisotropy of the samples' specific electrical conductivity is shown using data from non-destructive visualization of their internal structure.