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I am definately no expert but this may be of help. Someone with a bit more knowledge feel free to shoot this down..

Liner Completions

In this case the casing is set above the primary zone. An un-cemented screen and liner assembly is installed across the pay section. This technique minimizes formation damage and gives the ability to control sand. It also makes cleanout easy. Perforating expense is also low to non-existent. However gas and water build up is difficult to control and selective stimulation not possible the well can’t be easily deepened and additional rig time may be needed.