Abstract: Steam huff and puff is the major technology for the development of heavy oil reservoirs now. But for the super heavy oil reservoirs whose oil viscosity is far larger than 5×10⁴mPa·s, the screening conditions are still unclear. According to the present oil price, the periodic ultimate oil-steam ratio of single well, the ultimate oil production of single well and other economic indices are studied based on input and output balance principle. Then screening criteria for steam huff and puff are discussed by simulation. The simulation results show that the super heavy oil reservoir is suitable for steam huff and puff when the oil viscosity is less than 50×104 mPa·s, the effective thickness is lager than 8.5 m, the net-gross thickness ratio is larger than 0.4, oil saturation is lager than 50%, porosity is larger than 20%, permeability is larger than 500×10^-3μm², and the Kv/Kh ranges from 0.1 to 0.5. The determination of these screening conditions will be an important guiding significance for steam huff and puff in super heavy oil reservoirs.

Key words: super heavy oil reservoir, steam huff and puff, steam stimulation, screening, condition, oil-steam ratio