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A "pocket" permeameter has been designed for rapid measurement of rock permeability, both in the field and in the laboratory. The instrument measures the flow of air sucked through a rock sample by a squeeze bulb. The bulb provides a vacuum to establish a radial pressure gradient around the instrument orifice which is pressed against the rock surface. The permeability measurement is indicated by the height to which a marker ball in a flow gauge is raised by the air flow. The permeameter is capable of measuring permeability in the range of 10-250 md on a fairly smooth rock surface. Modification in design can change the range of permeability measured. The instrument is intended as an auxiliary tool and not as a replacement for conventional core analysis. Cost of the materia s used in the device is approximately $20; assembly and calibration require about 3 hours.
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