Investigation on Wettability Alteration of Reservoir Rock During Adsorption of Organic Component of Crude Oil

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Monjezi, Reza | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47568 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Ghotbi, Siroos; Jafari Behbahani, Taraneh; Baghalha, Morteza
Abstract:
This study investigates the dynamic adsorption of asphaltene-in-toluene solutions on pack of wet calcite. All experiments were performed on mineral packs in sand-pack with mesh sizes between 100 to 140 (105 to 150 micron) and porosities between 40 to 46 percent. A UV–vis spectrophotometer was used to monitor the outlet concentration of asphaltenes. Experiments were performed for seven ionic strength of sodium chloride (6 to 1500 mM), five ionic strength of sodium sulfate (6 to 2400 mM) and four ionic strength of these salts mixture (12 to 3300 mM). In previous experiments the asphaltene concentration is 500 mg/l. Also two experments were performed with asphaltene concentration of 2000 mg/l. In addition, to see the effect of water saturation, an experiment was performed without water saturation. The asphaltene adsorption increases with increasing ionic strength due to the reduction in electrostatic force. So it reaches its maximum amount, and then decreases due to the increase in repulsion hydration force. In the case that sodium sulfate was used, the maximum asphaltene adsorption occurred. Asphalten adsorption was increased when the asphaltene concentration increased
Keywords:
Porous Media ; Sand Packed ; Brine ; Asphaltene Adsorption

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