Plugged base pipe for sand control

摘要: The flow apertures of a perforated mandrel are temporarily sealed by plugs which made sacrificial material, for example, zinc, aluminum and magnesium. prevent dirty completion fluid from passing through in out the screen as it is run into hole, thereby protecting plugging. During time plugs, cleaning circulated work string returned annulus between open well bore removing filter cake, drilling debris lost circulation material. After has been cleaned, filled with an acid solution or caustic solution, dissolves plugs. In alternative embodiment, each sealing plug body portion stub project bore. intersected vent pocket portion. opened mechanically shearing milling tool on concentric tubing string.