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Oilfield Glossary
Oilfield Glossary
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Tools

lifting sub

1. n. [Well Completions]
A short drillstring component that is temporarily connected to the top of a tool assembly that is to be lifted vertically, such as when running or retrieving a tool string. The external profile on the upper section of the lifting sub is similar to that of the completion tubing, enabling the rig elevators to lift the assembled tool string safely.