Micro-conductivity Imager Logging Tool

The Formation Micro- Conductivity Imaging Tool (MCI) provides detailed borehole resistivity image data.
Six pads on the Micro- Conductivity Logging tool are pushed against borehole wall by a hydraulic actuating device. The pads closely and consistently contact with borehole wall, which is essential to obtaining high quality image data.
Each pad contains 24 buttons (electrodes) surrounded by metal pad housing. To force the measuring current flowing into the formation, a control circuitry maintains a zero voltage difference between the focusing electrodes and the pad housing.
The total 144 buttons can provide 144 micro-resistivity measurements, with vertical and azimuthal resolution of 0.2a . The individual current measurement recorded from each button is a function of formation resistivity. These measurements are properly scaled to resistivity values so that they can be correlated with conventional shallow measurements. The current from the array buttons can be converted to high-resolution color or gray-scaled borehole images.