1Research Institute of Petroleum Industry (R.I.P.I.), P.O. Box 18745-4163 Tehran, I.R. IRAN
2Department of Chemical Engineering, Faculty of Engineering, Tarbiat Modares University, P.O. Box 14115-4838 Tehran, I.R. IRAN
In this work the likelihood of asphaltene deposition problems during dynamic displacement of oil by natural gas in unconsolidated porous media is experimentally inspected. The two different rock materials, limestone and sandstone, are used as a representative of porous media. Dynamic flow experiments indicate that the increase of natural gas injection increases asphaltene deposition in the unconsolidated matrix. The results of the study show that increase in asphaltene deposition leads to pore plugging, porosity reduction and absolute permeability damage. Irreducible water measurements showed that natural gas-induced asphaltenes change the rock wettability to oil-wet.
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