WELL SCREEN WITH DRAINAGE ASSEMBLY

摘要

A well screen assembly 240, 240' has an elongate base pipe 230 having apertures therein. A filtration layer resides around the base pipe. A drainage assembly 200, 200' resides between the base pipe and the filtration layer. The drainage assembly includes a plurality of elongate risers 205 carried on a mesh 225. The drainage layer supports the filtration layer apart from the elongate base pipe and defines an elongate passage 215 between the base pipe and the filtration layer that communicates fluid laterally through the drainage assembly.