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• Note: Both cores exhibited zero permeability to air. The air <br />flow reading recorded zero for all cases. <br />Again, movement of fines within the core could be the cause for <br />the zero permeability readings (see Permeability work sheet). <br />The core samples must have some permeability due to the fact <br />that the Beckman pycnometer measures grain volume by displacing <br />air through the core and thus gives effective grain volume <br />unless a crushed core is used. <br />Thus, hydrogen will be used to detect low permeability in the <br />cores. <br />Klinkenberg Permeameter <br />• Measures the amount of gas that passes through a core under a <br />given p P. Can use much larger a P's. <br />Hydrogen is used due to the small size of its molecules, and it <br />will pass much more easily through the core. <br />An 80 Asia d P is placed across the dry cores using cylinders <br />of hydrogen. <br />Note: The core showed a zero flow reading on the instrument <br />(lowest flow rate .OS cc/min.) The 80 psis P bled to <br />60 psis in approximately 1.5 hours. Thus, the core is <br />exhibiting some permeability. A 24 - 48 hour test <br />period will be required to measure the amount of <br />hydrogen flow. <br />Thus, the core is exhibiting permeability somewhere in the <br />microdarcy range. <br />Grain Size Analysis <br />• Two cores are crushed and run through 30, 50, and 70 mesh <br />sieves. <br />10 <br />