429663 Asphaltene Aggregation and Deposition in Porous Micromodel

Tuesday, November 10, 2015: 1:45 PM
Canyon A (Hilton Salt Lake City Center)
Yu-Jiun Lin1, Mohammad Tavakkoli1, Peng He1, Sun Young Ji1, Yap Yit Fatt2, John Chai3, Afshin Goharzadeh2, Francisco Vargas1 and Sibani Lisa Biswal1, (1)Chemical & Biomolecular Engineering Department, Rice University, Houston, TX, (2)Department of Mechanical Engineering, The Petroleum Institute, Abu Dhabi, United Arab Emirates, (3)University of Huddersfield, Huddersfield, United Kingdom

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.

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