What is a Sand Screen? (with picture) - wiseGEEKSand Screening Machine . The most frequent application for sand screens is in oil production. . A sand screen is often used to line the diameter of the bore, allowing oil and natural gases to filter through while keeping sand out of the bore.the screening of sand,Screening | Define Screening at DictionaryScreening definition, the act or work of a person who screens, as in . device used to separate smaller particles or objects from larger ones, as for grain or sand.