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Oilfield Glossary
Oilfield Glossary
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returns

1. n. [Drilling Fluids]
Mud that comes back to the surface and exits through the flowline after being pumped down the drillpipe. "Lost returns" is the situation in which some or all of the mud does not come back to the surface, which indicates that mud is being lost into weak, fractured or vugular formations downhole.