Abstract: Sand production is believed to be the main cause of casing damage based on well status survey in WZ oilfield in Dongpu depression. The casing deformation caused by sand production from unconsolidated sandstones and caving of the overlaying strata is studied through comprehensive analysis on morphologic characteristics of casing damage, horizon and perforation status, and rock properties. It provides a basis for preventing casing damage in unconsolidated sandstones.