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Noise Log

A highly sensitive, high fidelity, microphone employing piezo electric crystals that detect the disturbance caused by fluid movement downhole. Noise, or sound, is the disturbance created by mechanical energy moving through matter as a wave. A leak behind the casing where flow is constricted can create noise. Fluid moving through a hole in the casing can cause noise. Movement of fluid in channels that are present in cemented interval of a well can create noise. All these events can be detected by the use of a Noise Log.

The amplitude of the noise frequencies ranging from 200, 600, 1000 and 2000 hertz are measured. The noise log is often run in conjunction with a temperature log. They are primarily run in cased wells but can be used in fractured, hard rock environments exhibiting fluid movement from restricted fractures.

Below is a noise log detecting methane gas entering the well behind the casing at 1325 ft and 1410 ft.

Click on thumbnail for a larger image of the NOISE LOG sample log.

Download PDF of NOISE TOOL LOG

Download PDF of NOISE TOOL Specifications

 

Click to find more about:

Electric Log
Laterolog 3 Resistivity
Focus Dual Induction
Gamma-Ray/Spectral
Caliper
Sonic Velocity
Temperature
Fluid Resistivity
Video Survey
Spinner (Flowmeter)
Gyro/Directional Survey
Depth Specific Fluid Sampling Biological/Scale Sampling
Cement Bond Log

Acoustic Borehole Televiewer
Optical Borehole Televiewer
Noise Log
new Casing Inspection Log (CITM)

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