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Glossary:Wash pipe
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A nonupset pipe with an O.D. close enough to the I.D. of an inner pipe to cause hydraulic diversion. Used inside a screen during gravel packing to direct flow and gravel to the bottom of the screen and effect a tighter pack. Developing hydraulic diversion benefits with a wash pipe usually requires that the washpipe OD be at least 80% or the outer pipe or screen’s ID.