How do I change wettability?

Wettability change is normally treated with mutual solvents to remove the rock-oil coating (asphaltene or paraffin precipitation), followed by a strong water-wet surfactant to reduce the tendency of further hydrocarbon precipitation.

What is wettability alteration?

In the oil industry, the term wettability alteration usually refers to the process of making the reservoir rock more water-wet. This shift in wettability enhances oil recovery in oil-wet and weakly water-wet reservoirs and eventually increases the ultimate oil recovery.

How is wettability calculated?

Wettability is determined in three ways:

1. Measurement of the contact angle, or the product of the contact angle and the interfacial tension (the last term in Young’s equation)
2. Measurement of the relative amounts of oil and water displaced under similar conditions.

Is wettability a rock property?

Wettability is a tendency of fluid to stick to the surface of formation when other types of fluid are present. Several rock properties have a direct relationship to wettability, for instant relative permeability, capillary pressure and electrical properties. …

How is the wettability of a rock determined?

Wettability: Laboratory Determination. There are several methods for determining wettability of a rock to various fluids. The main ones are: Microscopic observation: This involves the direct observation and measurement of wetting angles on small rock samples.

How are wettability measurements used in the laboratory?

Consequently, the contact angle measured in the laboratory may not represent the natural wettability of the system under examination. Amott wettability measurements:This is a macroscopic mean wettability of a rock to given fluids. It involves the measurement of the amount of fluids spontaneously and forcibly imbibed by a rock sample.

How is the wettability index of a reservoir used?

The determination of representative capillary pressure () data and wettability index of a reservoir rock is needed for the prediction of the fluids distribution in the reservoir: the initial water saturation and the volume of reserves.

How does wettability affect the distribution of oil and water?

Wetting fluid (water) and nonwetting fluid (mercury). It is the wettability of the reservoir rock that controls the distribution of oil and water and affects their movement through pore spaces. Understanding wettability in porous media is, by itself, a difficult problem.