1. n. [Drilling Fluids]

A subjective description of a filter cake, especially its toughness, slickness and hardness. A mud engineer makes these observations, which are recorded on the mud report along with filtrate volume and cake thickness. With increasing experience, the engineer's observations can become less subjective.

See related terms: acrylamido-methyl-propane sulfonate polymer,  differential sticking,  dynamic filter press,  dynamic filtration,  filtercake,  filter press,  filter-cake thickness,  low-pressure, low-temperature filtration test,  mud engineer,  static filtration