Multi-Array Induction Tool uses multi-spacing and multi-frequency measurements to acquire a complete set of data from the formation. The tool acquires formations resisitivity from different investigation depths.

Multi-Array Induction Tool is equipped with eight groups of receiving coils, which acquire twenty-eight raw logging data in three frequencies. After correction and self-adapting software focusing processing, the logging data are converted to fifteen curves with three vertical resolutions and five radial investigation depths. The minimum vertical resolution is 11.81 in (30cm); the maximum investigation depth is 88.58 in (225cm).

Multi-Array Induction Tool is an important logging tool for oil/water differentiation and oil saturation evaluation.

The resisitivity curves with high vertical resolution are essential in laminated sand/shale reservoirs for thin layer delineation and oil saturation calculation. The resisitivity curves with five radial investigation depths can be further processed to present invasion profile image or oil/water saturation profile image, which presents a clear picture for invasion and oil/water zone identification. Multi-Array Induction Tool can work in water-based mud, oil-based mud or air filled borehole.

Multi-Array Induction Tool


Multi-Array Induction Tool Coil system adopts asymmetry structure with one transmitter coil and eight receiver coils. It works at three frequencies.

Multi-DSP and array coil system are adopted in the tool. The multi-channel, multi-frequency weak signal pick-up in the tool is achieved by real-time calibration, digital filtering and digital phase-sensitive detection technology. A lot of mechanical and electronic measures have been taken for reaching the desirerable tool stability and high reliability.

Due to the excellent performance, high reliability and high accuracy of Multi-Array Induction Tool, many oil companies decide to adopt Multi-Array Induction Tool as one important part of their logging program.


311 ℉(155℃)
14503.8 Psi (100 MPa)
Data Transmission
430 kbps/100 kbps
3.74 in. Φ95 mm
(Cartridge:3.54 in Φ90 mm)
Tool Length
32.15ft (9.8 m)
Logging Speed
54.68 ft/min (1,000 m/h)
Borehole Size
4.53~11.81 in. (115~300 mm)
Measuring Range
0.1~1000 Ω·m
Vertical Resolution
±0.75 ms/m or < 2%
1.81 in., 23.62 in., 47.24 in.
(30cm, 60cm, 120cm)
Investigation Depth
9.84 in., 19.69 in., 29.53 in., 59.05 in. 88.58in.


  • Accurate formation resistivity measurement with three vertical resolutions and five investigation depths
  • Accurate oil/water saturation evaluation (both oil saturation and residual oil saturation)
  • Thin layer analyses in laminated reservoirs
  • Oil/water zone identification by resistivity profile images in many difficult cases, like deeply-invaded formations etc.
  •  Resistivity measurement in oil-based mud or air-filled boreholes.
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