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Question (23):

Updated: Sep 21

The contact angle measured through the water phase measures 10°, what can qualitatively be said about the wettability of the rock surface?

(a) It is water wet

(b) It is oil wet

(c) It is strongly water wet

(d) It is strongly oil-wet

Difficulty Level: Medium

NCEES Topic/Subtopic: Reservoir/Rock Properties

Comment: The closer the contact angle is to 0° the more strongly water wet the rock surface is and the closer it is to 180° the more strongly oil-wet the rock surface is.

Answer & Reference(s): (C): Page. 13 – 20. The Reservoir Engineering Aspects of Waterflooding, Forrest F. Craig. Jr. (1993)

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