Unsteady State Gas Permeameter


The unsteady state gas permeameter is such an apparatus used to determine permeability of plug sized core samples at reservoir confining pressure. The gas permeability determination is based on the unsteady state pressure falloff method. Measuring the low permeability core samples with steady state method is very time consuming. Therefore, unsteady state method is a fast and suitable way of measuring permeability range of 0.01 mD to 1 D. The instrument is provided with precise pressure transmitters, and it is operational in oil and gas industries and educational studies.


  • Permeability ranges: 0.01 mD - 1 D
  • Temperature: ambient
  • Pressure transmitters accuracy: 0.1% F.S.
  • Power: 220 VAC, 50/60 Hz
  • Core diameter: 1˝ or 1.5˝
  • Core length: up to 3.1"
  • Wetted material: Stainless Steel 316


  • Core holder
  • Confining pump
  • Pressure transmitter
  • Regulator
  • Data acquisition

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