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<br />~~ <br />Permeability Measurements <br />The permeability values listed in the foregoing table were measured <br />using an air permeameter. The field samples of core were drilled with a <br />diamond core drill to produce a cylindrical plug 1 inch in diametf:r and of <br />variable length. The ends were squared and the dimensions recorded. The <br />plugs were dried in an oven for 24 hours at a temperature of 105°L. The <br />dry weight was measured and recorded. <br />The permeameter consists of a rubber sleeve into which the core plug <br />is inserted. Stainless steel end plates are positioned on each end of the <br />plug inside the sleeve. A pressure of approximately 80 psi is exerted on <br />the exterior surface of the sleeve to prevent by-pass of air bet~,veen the <br />plug and the sleeve during the measurement. .4ir is passed through the plug <br />parallel to the long axis and the pressure drop is measured with an oil- <br />filled manometer. The rate of air flow through the plug is precisely <br />measured with a soap-film flow meter. The dimensions of the plug, the air <br />discharge, and the pressure difference permit calculation of intrinsic <br />permeability as indicated at the bottom of Table A1. <br /> <br />i <br />L <br />