Influx of reservoir fluid into the wellbore during drilling or workover that results in shutting in the well and increased pressure below the shut-in device (usually a BOP).

Source: API Standard 2RD, Dynamic Risers for Floating Production Systems, Second Edition, September 2013. Global Standards


Influx of formation liquids or gas into the wellbore. NOTE: Without corrective measure, this condition can result in a blowout.

Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards



Intrusion of formation fluids into the well bore.

Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards



Unplanned, unexpected influx of liquid or gas from the formation into the wellbore, where the pressure of fluid in the wellbore is insufficient to control the inflow. If not corrected can result in a blowout.

Source: IADC UBO / MPD Glossary, December 2011. Global Standards



“Kick” means the intrusion of formation liquids or gas that results in an increase in circulation pit volume. Without corrective measures, this condition can result in a blowout.

Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. Regulations

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