Abstract: Liaohe Oilfield is the largest thermal recovery base of heavy oil in China, which enjoys abundant heavy oil resources. Most of the heavy oil resources are productd by steam stimulation, with oil recovery factors of only 22%～25%. To improve the recovery factors of the superheavy oil reservoirs in Liaohe Oilfield, the laboratory physical simulation of steam assisted gravity drainage (SAGD) were carried out targeting the more deep buried depth of the reservoirs, interlayer developed reservoir, and increasing heterogeneity after steam stimulation. Meanwhile, a series of studies were conducted to tackle key issues inreservoir engineering, such as drilling and production technology and surface treatment technology. SAGD in Liaohe Oilfield experienced three stages,the pilot tests,the first phase of industrialized project and the enlargement of industrialization. And now there are 72 SAGD well groups and the annual oil production reached to 105×10⁴t/a in 2019, exceeded 100×10⁴t/a for three years. The SAGD technologies of reservoir geology, reservoir engineering and progress of surface technology were mature and complete, which provides references for the development of similar oil reservoirs.

Key words: super heavy oil, steam-assisted gravity drainage, reservoir engineering, enhanced oil recovery, Liaohe Oilfield