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The Back Portable Probe Permeameter provides a precise method for rapidly determining
gas permeability in field locations and at surface outcrops.
Data is determined by the unsteady state method, pressure decay is measured as a
function of time allowing for the computation of Kgas. The system is provided in
a rugged case housing for the probe permeameter, mounted on a backpack, with the
micro PDA and mounted on the probe being designed to be carried to the field and
operated from the backpack.
The instrument includes a gas reservoir that allows
measurements to be made independent from a gas source. A 24-volt power pack supplies
electricity for the instrument. Field measurements are made in the field by pressing
the probe tip against the rock surface. Initial flow pressure of 35 psi, declines
as gas flows into the rock surface, the decay versus time is recorded and the permeability
calculated from the pressure decay curve.
Data can be measured from outcrops, whole cores and slabbed cores as well as other
types of samples. Data are available in tabular and digital form.
API Recommended Practice 40 for Core Analysis; Section 6 Permeability Determination