Oilfield Glossary
Oilfield Glossary
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nipple down

1. vb. [Drilling]
To take apart, disassemble and otherwise prepare to move the rig or blowout preventers.
2. n. [Well Completions]
The process of disassembling well-control or pressure-control equipment on the wellhead. Depending on the configuration of the wellhead and casing strings, it may be necessary to nipple-down and nipple-up the blowout preventer (BOP) system as each casing string is run.
Antonyms: nipple up, nipple-up