Abstract: The heavy oil reservoir in Shengli Oilfield is typically double-low unit. The present recovery is very low，and
exploitation is difficult because of poor reservoir development and fluid properties. Due to the serious problems of high-pressure
steam injection and poor steam injection effect and low-cycle oi1 production in the reservoir，this paper studies improvement
of heavy oi1 properties through injection CO2，FSP oil-soluble viscosity reducer. According to the geological characteristics of
reservoirs，the different chemical huffing and puffing technology are applied in wells of different development characteristics.
It achieved obvious effects of oil incremental.

Key words: heavy oil fault block reservoir, carbon dioxide, FSP viscosity reducer, producing energy, chemical huffing andpuffing technology