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|Title:||An Experimental investigation of the effect of pressure gradient on gas-oil relative permeability in Iranian carbonate rocks|
|Citation:||Petroleum Science and Technology, 2012; 30(14):1508-1522|
|Publisher:||Marcel Dekker Inc|
|A. Keshavarz, H. Vatanparast, M. Zargar, A. Kalantari Asl and M. Haghighi|
|Abstract:||The authors examine the effect of pressure gradient on gas-oil relative permeability in horizontal and vertical immiscible displacement. The experiments are conducted on a core from lower Dalan formation in the South Pars oilfield of Iran, in constant pressure, unsteady-state condition, and different pressure gradients. The Toth method is used for calculating the relative permeability and plotting proper curves. Data analysis and the effect of pressure gradient on gas-oil relative permeability are investigated. Results show that relative permeability curves are affected by pressure gradient and this effect is much prominent at low pressures due to end-effect phenomena. The dependence of relative permeability curves on pressure gradient is correlated as a function of dimensionless capillary number. The accuracy of this correlation for relative permeability prediction is examined and a new method is introduced to minimize the end-effect phenomena on relative permeability curves.|
|Keywords:||Capillary number; end-effect; immiscible displacement; pressure gradient; relative permeability|
|Rights:||Copyright © Taylor & Francis Group, LLC|
|Appears in Collections:||Australian School of Petroleum publications|
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