This report describes the development of a new method for the direct and unambiguousmeasurement of the pore size of sand screens. The calibration procedure utilizes a sonicsieving device that energises glass microsphere standards to efficiently transport themthrough the filter mesh. From the percentage passing, a calibration graph is used todetermine the filter cut point, which is traceable to international standards of length. Thedefinition of a cut point and its relation to the maximum pore size is also discussed. Therepeatability of the method at all stages from single 90mm discs through the productionprocess to the final assembled sand screens for the pipeline is rigorously investigated. TheSonic challenge test as it is known is compared to the Porometer method based on thebubble point test.
