Abstract: To further improve the recovery ratio of medium and deep heavy oil reservoirs, more than 30 years’ steam flooding course in Liaohe Oilfield is comprehensive review, we have systematically summarized the development course, development status and application effects of medium and deep heavy oil steam flooding theory and technology of Liaohe Oilfield were summariled systematically. The research shows that the medium and deep heavy oil steam flooding technology of Liaohe Oilfield has experienced four development stages, exploration, pilot test, large-scale implementation of Gade I oil reservoirs as well as testing and substitution of Gade II oil reservoirs; the theoretical understanding and development technology have experienced the direct application of mature technologies at home and abroad into the research and development innovation combined with the geological characteristics of Liaohe, forming a series of medium and deep heavy oil steam flooding development technologies centered on the theoretic understanding of oil displacement mechanism, reservoir engineering design technology and supporting efficient injection and production technology; currently, the depth limit of steam flooding has exceeded 1 600 m, and the viscosity of available heavy oil is increased to 200 000 mPa·s, and the estimated recovery ratio is 55%-65%, reaching the international development level of shallow steam flooding; and in the future, we should develop and break through the difficulties and key points in medium and deep steam flooding. This research provides an important support for the stable production of 10 million tons in Liaohe Oilfield.

Key words: medium and deep heavy oil, steam flooding, oil displacement mechanism, super heavy oil steam flooding, flooding and drainage composite, Liaohe Oilfield