18 July 2017

Nipple down

Disassembly of well control equipment and lines for removal.
18 July 2017

Nipple up

In drilling, to assemble the blowout preventer stack on the wellhead at the surface.
18 July 2017

Non-shearable

A non-shearable is normally accepted as a component of the drillstring: BHA or a large size casing string that cannot be sheared under expected wellbore conditions […]
18 July 2017

Normal circulation

The smooth, uninterrupted circulation of drilling fluid down the drill stem, out the bit, up the annular space between the pipe and the hole, and back […]