Perforating plugged screens or slotted liners is a common remedial procedure to restore inflow
In unconsolidated sand reservoir perforating a plugged liner in a manner that manages sand inflow stimulates flow rate by expanding the effective wellbore
Cavity Completion (called CHOPS in Western Canada heavy oil wells) is controlled extraction of several hundred cubic meters of near casing or liner sand resulting in oil inflow 4 to 6 times greater than theory predicts, and increases recovery more than 5 fold over sand exclusion completions
Controlled sand extraction is accomplished through designed perforating plus modern liner sand removal equipment and production practice
Performed at Maximum Drawdown sand extraction rapidly diminishes to less than 1% for the life of the well.
Total sand volume extracted is less than 2% of the volume of reservoir sand in the drained area.
The entire liner does not need to be perforated to maximize recovery. Use the average drained diameter of off-setting vertically cavity completion produced wells to determine perforation spacing. If vertical wells are unavailable, start with 100 meter spacing.
