In order to solve the problem that steam injection alone is difficult for heat transport into the deep layers of heavy oil reservoir,a steam injection technique assisted by adding carbon dioxide(CO2)and chemical agents was pro-posed and investigated in this study.This technique can not only reduce the ineffective heat dissipation of steam,but al-so can expand the heat transport distance of steam.At the same time,CO2 can be effectively captured and sequestered in the heavy oil reservoir,which is beneficial for greenhouse gas emission reduction.The results show that CO2 and chemical agents can adsorb on the surface of steam condensing medium to form a heat insulation film,which can hinder the heat exchange between steam and heat transfer medium,slow down the heat release process,increase the heat trans-port distance of the steam,and thus mobilize the heavy oil from the deep formation.The experimental results show that the steam heat loss can be reduced by 5.48%with oil recovery rate increased by 14.5%under the synergistic effect of CO2 and chemical agents.The results can provide theoretical guidance for the optimization of the gas and chemical-as-sisted steam flooding technique.
steam floodingheavy oilcarbon dioxidechemical agentdeep heat transfer
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