Abstract: A well system comprising an improved cross-over tool is provided. The tool may comprise a debris shield for substantially preventing sand, proppant or other well debris from fouling a flow port closing sleeve located below the cross-over tool fracture ports; a return port cover adapted to close or open a return port upon contact with a designated downhole surface regardless of tubing movement caused by stretching or contracting under stress or other induced pipe movement from downhole conditions; or a collet-type circulation valve adapted to mechanically indicate the position or flow status of the cross-over tool.

Abstract: The present invention provides a return port cover that can close and open a return port separate from tubing movement caused by stretching or contracting under stress or other induced pipe movement from downhole conditions. For example, the return port cover can assist in preventing pack “fluffing” by preventing unintended fluid communication through an associated downhole tool regardless of the position of a circulating valve means. The return port cover can be biased, so that in one position it closes the port and in another position opens the port based on relative tubing placement at different portions of the fracturing operation or other well treatment operations.

Abstract: A system and method for perforating and gravel packing a wellbore casing in a single trip into the wellbore comprising a gravel packer assembly having a production screen and at least one packer. A perforating apparatus connected to the gravel packer assembly, wherein the perforating apparatus is detachable from the gravel packer assembly after the system is placed in the wellbore and before a detonation of the perforating apparatus. A tool having at least one casing engaging slip segment, wherein the tool is matable with the perforating apparatus and is settable in the wellbore casing.