Petroleum and Coal Pet Coal (2018); 60(4): 570-583 ISSN 1337-7027 an open access journal Article Open Access EXPERIMENTAL STUDY AND DYNAMIC PORE SCALE MODELLING OF ASPHALTENE PRECIPITATION IN POROUS MEDIA Abbas Khaksar Manshad 1,4* , Ali Nikooey 2 , Siavash Ashoori 2 , Amir H. Mohammadi 3* , Rasoul Hassanalizadeh 3 , Jagar A. Ali 4 1 Department of Petroleum Engineering, Abadan Faculty of Petroleum Engineering, Petroleum University of Technology (PUT), Abadan, Iran 2 Department of Petroleum Engineering, Ahwaz Faculty of Petroleum Engineering, Petroleum University of Technology (PUT), Ahwaz, Iran 3 Discipline of Chemical Engineering, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa 4 Department of Petroleum Engineering, Faculty of Engineering, Soran University, Soran, Kurdistan Region-Iraq Received February 7, 2018; Accepted April 23, 2018 Abstract Asphaltene precipitation in the porous environment is one of the important problems that redeuces the oil reservoir's productivity. In this work, we re-visited several experimental works which have been designed and performed to obtain the permeability declination in a slim tube. By using a slim tube packed with glass beds as a synthetic porous medium and under different conditions this modeling has been performed. At different temperatures, various injection rates and oil to solvent volume ratios studied under different flood test experiment. In this study, single phase flow of oil in the slim tube using a dynamic pore scale network model was simulated, and a mathematical model was developed for matching an experimental data. The results obtained from various simulations of network model were compared to those data which have been achieved experimentally. The current model is based on the theory of deep bed filtration as well as an introduction of the relationship of initial and damaged permeability as a function of porosity change which was caused by deposition of asphaltene on the experimental setup. To simulate the porous medium under the experimental condition in order to estimate the value of the inclination of permeability. There is a good agreement between obtained experimental data and model results which shows the quality of the model. Keywords: Asphaltene precipitation; Slim-tube; Permeability reduction; Porosity; Network model. 1. Introduction Asphaltene precipitation and deposition can be decreased by means of different processes (mechanical, electrical or chemical) which are capable of elimination or decreasing colloidal particles leading to asphaltene deposition [1] . There are plenty of experimental efforts regar- ding asphaltene precipitation and deposition. Developed models with respect to asphaltene precipitation prediction can be categorized into two main groups of scaling rules and thermos- dynamic studies [1 ]. Network based models consider the connectivity to represent the macroscopic level of the porous medium with acceptable results. Consequently, to calculate the macroscopic properties of the network, Percolation theory needs to be employed [2] . The earliest works on this subject [3-4] determined algorithms in 2D or 3D networks of the porous medium. The models are capable of simulating the porosimetric curves, which apply the theory of percolation to calculate the absolute permeability. 570