Halliburton Energy Services, Inc.

Siddhartha F Lunkad

Abhimanyu Pramod Deshpande

Christopher Lynn Gordon

Balasundaram Balaraman

Methods of determining the wettability of a surface under predetermined conditions, wherein the surface simulates or is a downhole surface for use in an oil or gas operation. The methods include the steps of: (A) contacting the surface with at least a first fluid; and then (B) observing the surface for the presence or absence of a marker to determine the wettability of the surface. According to a first aspect of the inventions, the first fluid comprises a first marker, and the step of contacting is under first predetermined conditions. This aspect also includes the additional step of contacting the surface with a second fluid comprising a second marker. According to a second aspect of the inventions, the step of contacting the surface with the first fluid is under predetermined conditions, and the surface is contacted with a second fluid comprising a second marker. According to a third aspect of the inventions, the first fluid comprises a first marker, the surface is contacted with a second fluid comprising a second marker, and both steps of contacting are performed under predetermined conditions.

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Pune, India

Siddhartha F Lunkad