COREVAL-Unsteady state gas permeameter and porosimeter

Click to download the datasheet Coreval 700.pdf


The Coreval 700 instrument accurately measures at overburden confining pressure (400 psi to 10,000 psi) the porosity and permeability to gas (helium/nitrogen) of plug sized core samples. The apparatus mainly comprises a hydrostatic core holder, pressure transducers, a temperature probe, control valves and a data acquisition & calculation computer station. Permeability to gas measurements are performed by virtue of the unsteady-state pressure fall-off method. After collecting enough data points, the Vinci software will execute a linear interpolation and output the equivalent permeability to liquid, slip and turbulence factors. Pore volume and grain volumes are determined via an isothermal helium/nitrogen expansion and the application of Boyle’s law and Charles’ law.


Permeability Range: 0.001md to 10 darcies (USS)
Porosity Range: up to 60%
Pore Pressure: 250 psi
Confining pressure: 400 psi to 10,000 psi
Temperature: ambient
Temperature accuracy: +/- 0.1 °C
Pressure transducer accuracy: 0.1% F.S.
Flowmeter: 0-600 cc/min
Helium: 400 psi N2: 500 psi
Air: 100 psi (dry)
Power: 110-220 VAC, 50 or 60 Hz