A basic requirement of any coating is that it should form a uniform, defect-free surface. Surface and interfacial tensions play a key role in that.
Contact angle hysteresis is often measured with so-called tilting cradle or plate method. The measurement can be done either manually or automatically.
Most commonly used methods to study reservoir wettability are Amott-Harvey, USBM, and sessile drop contact angle.
Dynamic contact angle measurements with the needle method has been automated for reliable and repeatable results.
Different enhanced oil recovery methods are used to alter the wettability of the reservoir rock. To study the wettability alteration at the reservoir conditions, an instrument where the measurements can be done at high pressures and temperatures are needed.
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