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8411697 
Journal Article 
METHOD FOR TESTING RATE OF GAS DIFFUSION IN CRUDE OIL BY PERIODIC MEASUREMENTS OF CONCENTRATION PROFILES 
BROW GT; CUPPS CQ; FRY J 
1970 
An experimental method is described for testing diffusion of gases in crude oils at pressures and temperatures up to 3000 psia and 200 F. A specially designed microsampler has been designed to trap about 4 U 1 of oil to be completely inserted in the sample inlet of a chromatograph. From analysis in a three-stage chromatograph (GLC), gas concentration in a sample is determined from the ratio of gas peak heights to area of peaks of reference components (hexanes or heptanes) in the oil. A diffusion coefficient is calculated from measuredoncentration profiles with known equations for diffusion in finite or semi-infinite systems, depending on whether the gas has or has not reached the end of the oil column.