"Conventional crude" refers to oil that is found in underground reservoirs and can be easily extracted using traditional drilling methods. Full definition
In this form, it has the consistency of conventional crude and can be pumped through pipelines, but it carries additional risks. (dirtyoilsands.org)
Political leadership has not existed which could visualize a future when conventional crude oil must give way to whatever is next. (dotearth.blogs.nytimes.com)
Conventional crude petroleum and natural gas extraction was also down. (ello.co)