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The asker has declined this answer Comment: tuberia de perforacion = drillpipe, not perforation tubing.
3 hrs confidence:
Explanation: I'm not sure, but this is the first option that came to my mind
At the top of the well, the mud flows though the blowout preventers and on to a series of screens called the shale shaker. The shale shaker is designed to separate the cuttings from the drilling mud. http://www.lloydminsterheavyoil.com/rotary.htm