A predetermined fluid circulating rate, expressed in fluid volume per unit time, which is to be used to circulate under kick conditions. The kill-rate is usually some selected fraction of the circulating rate used while drilling.
Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards
A predetermined fluid circulation rate expressed in volume per unit of time that is used under kick conditions, often a selected fraction of the circulating rate time unit used while drilling under normal conditions.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards