Research progress and evaluation method of "gas-wetting"

Wettability is a tendency for one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids.The can improve gas recovery of condensate reservoir,its mechanism is by altering the wettability of wellbore region from liquid-wetting to gas-wetting to improve the gas recovery.Also studies some methods of wettability,such as contact-angle method,the Amott method and USBM method,analyzes the characteristic of these methods,and proposes several quantitative methods for gas-wetting,finally summarizes the development trend of the gas-wetting.