Annular velocity Definition


Annular velocity:

The speed at which drilling fluid or cement moves in the annulus.

It is important to monitor annular velocity to ensure that the hole is being properly cleaned of cuttings, cavings and other debris while avoiding erosion of the borehole wall.

the annular velocity is commonly expressed in units of feet per minute or, less commonly, meters per minute.

The term is distinct from volumetric flow.