Abstract: A well screen assembly may be used for flow and sand control in a tubing string within the wellbore in downhole operations. The well screen assembly includes at least two filtration layers are disposed around a base pipe. Each filtration layer is configured to filter particulates from the fluid as the fluid flows through the filtration layers and into a bore of the base pipe. Additionally, outer shrouds are disposed about respective filtration layers and removably coupled to the base pipe. The outer shrouds can be solid outer shrouds for blocking fluid communication between an exterior of the outer shroud and the filtration layer or perforated outer shrouds for allowing fluid communication between the exterior and the filtration layer. The outer shrouds are interchanged to allow the use and blocking of different filtration layer.