This report describes the development of a new method for the direct and absolute measurement of the pore sizes. The calibration procedure utilizes a sonic sieving device that energises glass microsphere standards to efficiently transport them through the filter mesh. From the percentage passing, a calibration graph is used to determine the filter cut point, which is traceable to international standards of length. The definition of a cut point and its relation to the maximum pore size is also discussed. The repeatability of the method at all stages from single 90mm discs through the production process to the final assembled sand screen elements is rigorously investigated. The report also introduces a novel method to determine pore size distributions based on glass microspheres trapped within the pores. The method is highly accurate, traceable to international standards, and can discriminate between ‘open’ and ‘closed’ pores.
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