Oilfield Glossary
Oilfield Glossary
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Tools

drop sub

1. n. [Perforating]
A device, shaped like a short length of pipe, which is used to drop TCP guns in the rathole or sump. It is commonly used to drop guns that are connected to the completion into the sump, thus providing access to the reservoir for subsequent intervention work. It may also be used to break the tool string into fishable sections.