Definition(s)
Slug Tank
Small compartment, normally adjacent to the suction compartment, used to mix special fluids to pump downhole. NOTE Slug tanks are most commonly used to prepare a small volume of weighted drilling fluid before a drillstem trip in and out of the borehole.
Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards