ISO 20815

ISO 20815 is the International Organisation for Standardisation (ISO) standard for production assurance and reliability management in the petroleum, petrochemical and natural gas industries.
The 2008 version of the standard was last reviewed and confirmed in 2012. It has been replaced by ISO/DIS 20815:2018 in October 2018.
The division of the oil and gas industry into upstream, midstream and downstream sectors is referred to in the standard.