Research Institute of Petroleum Industry (RIPI) Journal of Petroleum Science and Technology 2251-659X 7 2 2017 06 20 An Investigation of Asphaltene Deposition Mechanisms During Natural Depletion Process by a Two Phase Modeling Using Genetic Algorithm Technique 12 20 744 10.22078/jpst.2017.744 EN Sepideh Kashefi Faculty of Chemical, Gas and Petroleum Engineering, Semnan University, Semnan, Iran Mohammad Nader Lotfollahi Faculty of Chemical, Gas and Petroleum Engineering, Semnan University, Semnan, Iran Abbass Shahrabadi Exploration and Production Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran Journal Article 2015 05 12 In this work, the natural depletion process in sandstone and carbonate cores was modeled to investigate the asphaltene deposition mechanisms. A new permeability reduction correlation was proposed based on the Minssieux model that considers a combination of surface deposition, pore throat plugging, and filtration cake mechanisms. The results showed that the filtration cake is a dominant asphaltene deposition mechanism during natural depletion process in both core samples. Therefore, a modified model was proposed with adding formation of filtration cake mechanism due to pore filling to the Wang and Civan deposition model. The absolute average deviation (AAD (%)) for permeability reduction between the results of the three models (including new correlation, the modified model, and Wang and Civan model) and the experimental data were calculated and reported. These values for the three models were 3.28, 2.67, and 4.83% for sandstone core and 3.01, 2.58, and 4.69% for carbonate core respectively. The results showed that the modified model proposed in this study presented good performance for asphaltene deposition prediction https://jpst.ripi.ir/article_744_0537fb40a68c18da59a35c2bfe1ca554.pdf