Critical Well Components
Well components are considered critical when:
They form well barriers or can be defined as a well barrier element,
Consist of moving parts that over time are susceptible to failure,
Exposed over time to wellbore fluids that may be corrosive and/or erosive,
Are subject to wear and tear due to excessive use/functioning,
Or they show up as critical in the HAZID/risk assessment performed as part of the well construction process.
Source: NOGEPA Industrial Guideline No. 44, Standards and Acceptance Guidelines, Enhance QA/QC for Critical Well Components, Netherlands, Version 0, July 2011. Global Standards