Pulse Decay Experiments: Porosity, Permeability and Dynamic Adsorption Measurement

Pulse Decay Experiments: Porosity, Permeability and Dynamic Adsorption Measurement

  The pulse decay is the main method employed to determine permeability for tight rocks, and has been widely used in oil industry. This in-house developed set up at TORP can measure the porosity and permeability of core sample at various temperature and pressure. The porosity of core sample is directly derived from Boyle’s law whereas the permeability is estimated by the pressure pulse decay and evaluated with either analytical or numerical solution. Non absorbed gas, Helium, is used in the test while other type of gas such as carbon dioxide and nitrogen can also be used to determine the adsorption capacity of rock pore surface.

  TORP Lab has successfully used this set up to measure porosity and permeability of core samples from several unconventional plays and tight carbonate reservoirs. Currently, TORP has one biaxial coreholder capable of housing 1 inch diameter and length up to 6 inch core plug, and another coreholder for 1.5 inch diameter and length up to 6 inch for the test.

  • Temperature: 68 -125 °F
  • Confining pressure: up to 10,000 psi
  • Effective pressure: up to 5000 psi
  • Core dimension: 1, 1.5 inch ID and 3 inch length maximum
  • Gas type: Helium, Nitrogen, and Carbon dioxide

     
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