Wettability is always an important issue for reservoir engineers. Wettability alteration is one of the significant indexes to show the capability of oil recovery of reservoir. In the recent years, various approaches to change wettability have been suggested by scientists and researchers such as chemical flooding and nanofluid injection. The purpose, in oil wet condition, is to change wettability to water wet condition to obtain more recovery. A lot of different methods for wettability measurement such as Contact Angle, Amott methods and USBM are proposed by Anderson and others. The most accurate method is contact angle for wettability measurement.

Plasma is one of the four fundamental states of matter. Heating a gas may ionize its molecules or atoms thus turning it into a plasma which contains charged particles: positive ions and negative electrons or ions. A nonthermal plasma is in general any plasma which is not in thermodynamic equilibrium, either because the ion temperature is different from the electron temperature or because the velocity distribution of one of the species does not follow a distribution. The effect of cold atmospheric argon/oxygen plasma torch based on dielectric barrier discharge was investigated on different surfaces. The experiments were conducted on the mica, glass slide and slice of dolomite core surface which is aged with oil and without oil and on a dolomite core with oil after waterflooding. The time interval of plasma torch treatment on these surfaces were 1, 3 and 5 minutes and contact angle measurements done 1, 14 and 28 minutes after plasma treatment. The range of contact angle decrease is between 5 to 41 degree and Fourier Transform Infrared Radiation (FTIR) spectroscopy was carried out for analysis of surface chemistry. It is worth mentioning, however, that it is a novel method and requires more investigation in order to be feasible in reservoir conditions.

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