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Flow characteristics and reaction properties of carbon dioxide in microtubules and porous media

Chinese Science Bulletin 2008年第21期53卷 3409-3415页

作者： ZHAO RenBao YUE XiangAn WU YaHong XU ShaoLiang WANG Fei HOU YongLi MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China Enhanced Oil Recovering Research Center China University of Petroleum Beijing 102249 China

Carbon dioxide reacts with porous media while flowing through them enhancing their *** flow behavior as well as the permeability enhancement effects were studied in synthetic cores,natural cores and microtubes with an inner diameter of 5 μ*** results show that the permeability of H2O-saturated cores(containing carbonate ingredients) was enhanced by increasing the injection volume of a CO2-H2O *** enhancement is attributable to carbon dioxide's corrosion,which is justified by SEM *** same phenomenon occurs with a CO2-H2O solution in microtubes,but for a different *** gas flow velocity of carbon dioxide in microtubes was approximately 100% faster than that of nitrogen because of the scale and the squeezing *** dioxide molecules dissolved in water accelerate the diffusion rate of water molecules within the boundary layer,which in turn diminishes the thickness of the water film and enlarges the effective pore *** flow behavior facilitates the injection of carbon dioxide into low-permeability reservoirs for oil-displacement and formation energy buildup *** behavior also increases the potential for carbon dioxide channeling or release from the formation.

关键词：二氧化碳超小型电子管微量作用腐蚀现象

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