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Direct Wettability Characterization of the Carbonate Reservoirs Using Different Microscopic TechniquesNormal access

Authors: A. Ivanova, N. Mitiurev, A. Cheremisin, A. Orekhov, A. Vasilev, M. Hairullin and I. Afanasiev
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: Carbonate Reservoirs A
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801599
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 624.58Kb )
Price: € 20

Summary:
Carbonate reservoirs, particularly limestones and dolomites, represent more than a half of world’s oil resources. Typically, carbonate rocks have complex structure and consist of a variety of minerals. For this reason, the characterization of such reservoirs is extremely complicated. Nevertheless, for successful oil production, it is very important to describe all mechanisms and parameters that control oil recovery. One of such essential factors needed to be measured is wettability. Formation wettability plays major role in fluids distribution through the porous media and, as result, determines the oil production. Moreover, wetting properties influence capillary pressure effects, water- and chemical flooding. Therefore, performing the wrong assumption of formation wettability may cause an unexpected oil recovery decrease and wellbore damage. Herein, we present the wettability measurements for carbonate samples from oil fields by the direct visualizing of phases interfaces using environmental SEM-imaging method. Water micro-sessile droplets were formed on samples surfaces due to the special thermodynamic conditions, which were created in a microscope chamber using Peltier table. Wetting properties were analyzed by observing contact angles between water droplets and surfaces. It was shown that carbonates have mixed wetting properties even at microscale.


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