RG - Dual Neutron
Well Logging System
    Model: Dual Neutron 
    Country of Origiin: UK
    Use: The Dual Neutron probe provides a calibrated borehole-compensated neutron porosity measurement in mud-filled open holes.
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It is the probe ofchoice for quantitative formation-fluid studies.

A single-detector neutron probe is also available for qualitative porosity logging under most borehole conditions including through steel or plasticcasing and drill-pipe.

Principle of Measurement:

The Dual Neutron measurement uses two 3 He proportional detectors and a detachable, sealed 241 Am-Be neutron source. Fast neutrons emitted by the source are scattered and slowed to thermal levels, principally by hydrogen in the formation. The ratio of the neutron flux reaching the near and far detectors depends on the hydrogen index and porosity. Use of dual detectors and a ratio method provides a porosity measurement compensated for borehole diameter but not independent of it.

SPECIFICATION:

Features

  • Real-time porosity measurement
  • Compensation for borehole diameter

Measurements
  • Compensated porosity
  • Neutron (raw counts)
  • Natural gamma
  • Option: Casing-collar locator (CCL)

Applications
Minerals/ Water/ Engineering


  • Lithology identification
  • Location of aquifer and aquitard
  • Fracture analysis in coals
  • Correlation between open and cased-hole logs
  • Strata correlation between wells

Operating Conditions
  • Borehole type: open/cased, water-filled
  • Centralisation: ex-centralised with bowspring
  • Recommended Logging Speed: 4m/min

Specifications
  • Diameter: 65mm
  • Length: 2.14m
  • Weight: 19.5kg
  • Temperature: 0-70°C (0-125°C optional)
  • Max. pressure: 20MPa
  • Range: 15 to 45% Limestone Porosity Units (LPU)

Part Numbers
  • I002029 Dual Neutron probe with natural gamma
  • I002030 - includes CCL
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STQ180173
STQ180170
STQ180168
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