COREVAL-Unsteady state gas permeameter and porosimeter
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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 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