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.
Features
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.
Specification |
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Temperature
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311 ℉(155℃)
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Pressure
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14503.8 Psi (100 MPa)
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Data Transmission
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430 kbps/100 kbps
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O.D.
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3.74 in. Φ95 mm
(Cartridge：3.54 in Φ90 mm）
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Tool Length
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32.15ft (9.8 m)
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Logging Speed
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54.68 ft/min (1,000 m/h)
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Borehole Size
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4.53~11.81 in. (115~300 mm)
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Measuring Range
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0.1～1000 Ω·m
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Accuracy
Vertical Resolution
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±0.75 ms/m or < 2%
1.81 in., 23.62 in., 47.24 in.
(30cm, 60cm, 120cm)
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Investigation Depth
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9.84 in., 19.69 in., 29.53 in., 59.05 in. 88.58in.
(25cm、50cm、75cm、150cm、225cm)
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Applications
- 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.
