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<br />I' <br />F ~~E <br />l <br />/- Permeability Measurements <br />J~ The permeability va]ues listed in the foregoing table were m~:asured <br />using an air permeameter. The fieid samples of core were drilled with a <br />diamond core drill to produce a cylindrical plug 1 inch in diameter and of <br />variable length. The ends were squared and the dimensions recorded. The <br />1 plugs were dried in an oven for 24 hours at a temperature of 105°f,. The <br />dry weight was measured and recorded. <br />The permeameter consists of a rubber sleeve into which the cnre 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 between the <br />plug and the sleeve during the measurement. Air is passed through the plug <br />parallel Lo the long axis and the pressure drop is measured with an oil- <br />1 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 Ai. <br />1' <br />i <br />1~ 1 <br />I <br />it <br /> <br />(I` <br />II , <br />