The purpose of the PROPERM is to perform rapid, non-destructive, localized permeability measurements on rock samples using the steady state method. The main components are pressure, flow, core frame, and injection probe modules. A measurement is taken by positioning the probe tip at a desired location on the sample and then pressing against its surface. Hereafter, nitrogen gas is forced to flow at constant pressure through the injection tip and into the permeable sample. A mass flow controller determines the flow rate while the pore pressure is deduced from a highly accurate electronic pressure transducer. The instrument is provided with a data acquisition and calculation computer station. Permeability values are derived from the modified Darcy’s law which includes a geometric factor that takes into account flow complexities around the tip seal.
Permeability Range: 0.01mD to 10 darcies
Pore Pressure: 100 psi
Probe actuator Pressure: 100 psi
Pressure transducer accuracy: 0.15% F.S.
N2: 250 psi
Air: 100 psi (dry)
Power: 110-220 VAC, 50 or 60 Hz
* The method is none destructive in the sense that there is no need to cut core plugs. It is rapid and low cost.
* The probe investigates only a small volume of rock. The measurement is well suited for investigation of spatial permeability variation in cores containing thin laminations and small scale heterogeneity.