Home > Term: junk sub
junk sub
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.
- Part of Speech: noun
- Industry/Domain: Oil & gas
- Category: Oilfield
- Company: Schlumberger
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Creator
- BSchmidt
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