The study on permeability reduction during steam injection in unconsolidated porous media

摘要: Abstract The effluents from steam generators usually have low salinity and high pH level during injection. Steam its condensate can cause particle migration hydrothermal reactions. Those largely decrease production potential of heavy oil resulting permeability reduction. flow experiments were conducted in sand-pack filled with unconsolidated sands. This paper presented the experimental results to evaluate influence temperature on Meanwhile, a series reactions analyze solubility solid particles condensate. showed that irreversibly reduced up 43.52%, but was only restored 66.32%. Sandstone interaction leads serious dissolution formation minerals subsequent precipitation new minerals. Particle reaction constitute primary damage mechanisms when are injected into porous media.