Formation pieces dislodged by the drill bit and brought to the surface in the drilling fluid. NOTE Field practice is to call all solids removed by the shaker screen “cuttings,” although some can be sloughed material.
Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards
Cuttings as mentioned in the first subsection, means both solid material from the formation and solid material added as part of the drilling fluid or other fluids used in drilling and well activities. Organic drilling fluid means mineral oil-based and synthetic drilling fluid.
Source: Guidelines Regarding the Activities Regulations, Norway, updated December 2012. Regulatory Guidance