Oilfield Glossary
Oilfield Glossary
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Tools

junk sub

1. n. [Well Workover and Intervention]
A downhole tool with a profiled external surface designed to catch and retrieve junk or debris from the wellbore. The debris is carried up the tool-string annulus in the circulation fluid. An indented profile creating a larger annular area causes the fluid flow rate to drop and allows debris to drop into a basket or receptacle located at the base of the tool.
Synonyms: junk basket