Response Simulation of MCI6505 Microresistivity Imaging Tool

Abstract

Studying the logging response of micro-resistivity scanning imaging tools under different geological features is a prerequisite for the in-depth application of wellbore electrical imaging logging data for geological feature interpretation. Many scholars are conducting related numerical simulations. Based on the electromagnetic field theory, this paper uses the finite element method to numerically simulate the response characteristics of the MCI6505 electric imaging tool developed by China National Petroleum Corporation Logging Co., Ltd. Using the developed 3D numerical simulation program simulation to determine the effective measurement range of the instrument, depth of investigation, K-factor and other key parameters. A conversion diagram between the instrument’s conductivity measurement signal and the true resistivity of the formation is established, and influences of the relative position of buttons on one pad, the standoff between the plate and the well wall, the diameter of the well or the pusher, and the mud resistivity are established. The influence rated on the above conversion relationship provides a reference for the quantitative calibration of the instrument.