well intervention
operation during/at the end of life of an oil or gas well to alter or manage production of the well
en-US/ˈwɛl ˌɪntɚˈvɛnʃən/
en-GB/ˈwɛl ˌɪntəˈvɛnʃən/
operation during/at the end of life of an oil or gas well to alter or manage production of the well