عنوان مقاله [English]
In this paper, a setup for performing dynamic flow experiments was prepared. A set of natural depletion tests were done to investigate the effects of pressure depletion and the initial asphaltene content of crude oils on asphaltene deposition in porous media using two live oil samples of Iranain reservoirs. The results of these experiments, which were done in constant rate and three pressure steps, show that the asphaltene deposition occurs by decreasing pressure in the vicinity of bubble point pressure and the main mechanisms are surface deposition, pore throat plugging and in some period the entrainment of the particles via the flow of oil is observed. According to the experiments, in case of the oils with less asphaltene content, the dominant mechanism is surface deposition, and the rate of deposition is uniform, while using the crude oil with higher asphaltene content, the pore throat plugging mechanism has more important role in the permeability reduction of reservoir rock.
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