RobertsonGeo - Ultrasonic Noise Detector (GND)
Well Logging System
    Model: Ultrasonic Noise Detector (GND)
    Country of Origiin: UK
    Use: The Ultrasonic Noise Detector module detects points of entry of high-pressure gas into an open borehole by listening for an ultrasonic signature.


     
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Principle of Measurement:

Sound energy caused by gas entering the borehole is focused by a conical acoustic mirror within the probe onto a microphone. The microphone is tuned to measure the acoustic energy in a frequency band centred at 40kHz, characteristic of entry of high pressure gas through a narrow orifice.


SPECIFICATION:

Features
  • Dual detectors in a differential configuration to reduce background noise
  • High-sensitivity microphones with acoustic focusing
  • Fully digital telemetry combines with density, neutron and other logging probes
  • Easy field access for replacement of microphones

Measurements
  • Mean acoustic energy within a fixed passband centred at 40kHz


Applications
  • Gas detection

Operating Conditions
  • Borehole type: Dry open hole only

Specifications
  • Diameter: 63mm (2.5”)
  • Length: 1.89m (75”)
  • Weight: 26.5kg (58.4lb)
  • Max. temperature: 125°C
  • Max. pressure: 1MPa
Solution
Applications
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STQ180170
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