Annulus Friction Pressure

Circulating pressure loss inherent in the annulus between the drill string and casing or open hole.

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


Annulus Friction Pressure (AFP)

Difference between bottomhole pressure and choke pressure due to friction; a function of flow rate, hole geometry, surface roughness, fluid properties.

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


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