Selecting a Surfactant for Wettability Alteration In Iranian Carbonate Reservoirs

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Zangeneh Var, Alireza | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39080 (06)
University: Sharif University of Technology
Department: Chemical and Petroleum Engineering
Advisor(s): Bastani, Daruoosh; Badakhshan, Amir
Abstract:
Fractured carbonate reservoirs are mostly oil-wet to intermediate-wet. Due to the negative capillary pressure of the matrix poor spontaneous imbibition of reservoir brine occurs in such reservoirs, and water flooding leads into early break through due to the high conductivity of the fracture network. Some surfactants have the ability to change the wettability of rock matrix toward water-wet state by adsorbing onto the rock surface. The phenomenon can result in spontaneous imbibition improvement and thereby increasing water flooding efficiency and recovery from fractured carbonate reservoirs. In this thesis the effect of some surfactants on the wettability of Iranian carbonate reservoir rocks is evaluated through spontaneous imbibition experiments. And the wettability alteration is studied trough capillary pressure changes, Amott-Harvey wettability index and USBM wettability index as well
Keywords:
Wetting ; Surfactants ; Capillary Pressure ; Fractured Carbonate Reservoir ; Spontaneous Imbibition