screen shroud 80 has one or more longitudinally deformable pleats 82 the exact orientation and location of the pleats 82 is not critical to the invention so long as the pleats are configured to incorporate the property of longitudinal deformability for example transverse pleats 82 or helical pleats may be used the pleated screen shroud 80 shown is welded 26 to the base pipe at either end 84 capturing the screen 21 and allowing space 86 for sliding movement at the ends 84 the pleats 82 may be arranged on the shroud 80 overlapping the screen 21 as shown in fig9 such that the pleats 82 act as a spacer maintaining fluid flow space 90 between the screen shroud 80 and screen 21 further referring to fig8 9 the pleats 82 are designed to facilitate longitudinal movement of the shroud 80 relative to the base pipe 12 defining a longitudinally deformably slidable joint 34 sufficiently close fitting to exclude sand particles of a size to also be excluded by the screen 21 but not necessarily fluid tight as the base pipe 12 and screen jacket assembly 20 are radially expanded with corresponding differential changes in length the pleats 82 of the shroud 80 deform longitudinally while maintaining their sand controlling fit as in the other embodiments described herein a screen 21 is captured between the shroud 80 and the base pipe 12 of course the exact orientation and location of the pleats is.