(355f) Asphaltene Aggregation and Deposition in Porous Micromodel Conference: AIChE Annual MeetingYear: 2015Proceeding: 2015 AIChE Annual MeetingGroup: Engineering Sciences and FundamentalsSession: Interfacial Aspects of Oil/Gas Recovery and Remediation Time: Tuesday, November 10, 2015 - 1:45pm-2:00pm Authors: Lin, Y. J., Rice University Biswal, S. L., Rice University He, P., Rice University Tavakkoli, M., Rice University Ji, S. Y., Rice University Chai, J., University of Huddersfield Goharzadeh, A., The Petroleum Institute Vargas, F., Rice University Fatt, Y. Y., The Petroleum Institute Asphaltene deposition is a common cause of flow assurance problems in wellbores and production equipment as well as near-wellbore regions in oil reservoirs. Therefore, understanding the mechanism by which asphaltenes deposit onto solid surfaces is highly desirable. Here we present our results for visualizing real time asphaltene deposition from model oil w/ and w/o commercial waxes (C18, C32) as well as dispersants (inhibitor X and Y from the Middle East, 4-hexyl-, 4-octyl-, and 4-dodecylphenol) using microfluidic devices. In particular, we consider porous-media micromodel designs to represent various flow conditions typical of that found in the near well-bore regions of oil flow processes. Deposition rate and patterns with micron-sized circular posts for 0.5 wt% model oil will be discussed with the properties of aggregates, including the radius of gyration and fractal dimensions. Also, four stages of deposition have been found and investigated in the pore scale and with qualitatively macroscopic total collector efficiency. A permeability reduction model is also proposed for this system. By understanding the nature and the mechanisms of asphaltene deposition, we increase our ability to design cost effective mitigation strategies that includes the development of a new generation of asphaltene deposition inhibitors and improved methods for prevention and treatment of this problem.