DUAL INJECTION POINTS IN SAGD

摘要

A method for recovering petroleum from a formation, wherein at least two injection wells and at least one production well are in fluid communication with said formation, including: introducing a gaseous mixture into a first and a second injection well at a temperature and a pressure, wherein said gaseous mixture comprises steam and non-condensible gas (NCG); and recovering a fluid comprising petroleum from said production well, wherein said injection wells and a production well are horizontal wells, and wherein said first injection well is disposed 1-10 meters above said production well, and said second injection well is disposed at least 5 meters above said first injection well.