Model experiments of sand production in a perforated sample of a weak outcrop sandstone are compared to tests on drilled cavities in the same rock. The perforation tunnel was filled with rock debris and a damaged zone occurred around it. Limited sand production resulted due to erosion of the rock debris, while instability of the perforation wall by formation of breakouts occurred at stress levels comparable to the failure stress of a drilled cavity. The failed material remained stable throughout the test, and most of the sand produced originated in the debris in the center of the perforation tunnel.

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