COREVAL-Unsteady state gas permeameter and porosimeter

Description
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.