THE STUDY OF AN ELECTRICAL MACROANISOTROPY IN THE INCLINED-AND-HORIZONTAL WELLS FROM THE DATA OF THE HIGH-FREQUENCY INDUCTION LOGGING WHILE DRILLING
Opportunities to identify thin-layered rock intervals (as potentially hazardous in the inclined directional drilling wells or multistage hydrofracturing them) using the high-frequency induction logging while drilling (VIK-PB in Russian) have been studied. A numerical analysis of the electromagnetic responses from the VIK-PB tool and their sensitivity to the geoelectrical parameters of the medium model (with its one or two horizontal boundaries crossed by a complex-trajectory inclined-and-horizontal well) has been carried out. It has been shown that, in the nearly-horizontal well interval crossing an electrically macroanisotropic formation, VIK-PB's relative amplitude-and-phase characteristics are sufficiently sensitive to the vertical resistivity of the formation, as well as to its top and bottom positions - which provides an opportunity to solve the problem of the identification of the thin-layered intervals while drilling.