The present invention provides apparatus and methods for expanding an expandable sand screen in the wellbore and then fracturing the wellbore. In one aspect of the invention, an expandable sand screen includes a perforated inner pipe and outer shroud. The outer shroud includes a plurality of longitudinal...http://www.google.com.au/patents/US6868905?utm_source=gb-gplus-sharePatent US6868905 - Expandable sand screen for use in a wellbore
