This definition appears very rarely
Samples in periodicals archive:
Steam Assisted Gravity Drainage Process In Alberta, 80 per cent (135 billion barrels) of the oil sands are buried too deep below the surface for open
Steam Assisted Gravity Drainage (SAGD; "Sag-D") is an enhanced oil recovery technology for producing heavy crude oil and bitumen. It is an advanced form of steam...
There are 7 phases planned for Cenovus's Christina Lake steam-assisted gravity drainage (SAGD) oil sands project to expand & increase production capacity