The Formation Micro – Conductivity Imaging Tool 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 0.2″. 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.


The optimum pad contact with borehole, maintained by an advanced hydraulic actuating device, makes it possible to acquire high quality image data in rough borehole conditions.

he new button and connector structure, the advanced sealing technique and up-to-the date electronics ensure the high reliability of the tool.

he complete calibration facilities and systematic calibration procedures ensure the data precision and consistency. The mature data acquisition and field processing software satisfy the clients with quick and flexible image presentation.

The tool can work in fast scanning mode, slow scanning mode or dipmeter mode.


  20,000 Psi (140 MPa) / 15,000 Psi (100 MPa)
  430 Kbps/100 Kbps
  Max. O.D.
  5 in.( Φ127 mm)
  Min. O.D.
  3 1/2 in. (Φ90 mm)
  Tool length
  27.2 ft. (8.3 m)
  Wellbore range
  6.3 in. ~20.8 in. (160~530 mm)
  Borehole coverage
  60% (in 8in hole)
  measurement range
  Inclination: 0°~90°±0.2°
  Azimuth: 0°~360°±2° (when inclination>1°)
  Resistivity measuring range
  Vertical resolution
  0.2 in. (5 mm)
  Caliper measuring range
  5 in. (127 mm) ~ 20.8 in. (530 mm)
  Logging speed
 1,476 ft/h (450 m/h), in Fast mode
 740 ft/h (225 m/h), in Slow mode


This tool is used to acquire and present variety of 2D or 3D borehole resistivity images, which are widely used in geological analysis, petrophysical analysis and borehole property analysis. The image data processing technique, image data base and intelligent image correlation technique greatly widen the application scope of MCI imaging logging data.

The logging data are mainly used for:

  • Sedimentary feature and rock texture recognition
  • Lithology identification, profile correlation and electro-facies analysis
    Fracture, vug and fault identification
  • Dip analysis and structural feature analysis in the vicinity of the borehole
  • Borehole geometry and in-situ earth stress analysis
  • Formation evaluation in carbonate reservoir and some igneous rock reservoir
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