关键词: 二氧化碳, 污泥, 多孔介质, 反应效率, 调剖, 储层伤害

Abstract: The oily sludge was studied through ICPOES and SEM measurements and chemical qualitative analysis methods. Both the results of ICPOES and chemical methods showed that carbonate was the main component. Rhombic calcite and spherical vaterite were observed by SEM. Carbon dioxide is produced when oily sludge and hydrochloric acid slug combinations are injected into porous media. Experiments are made about the infludence of two injection modes on reaction efficiency and porous medium permeability. The reaction efficiency of alternating slug injection is lower than that of blended injection. The gas volume produced increases exponentially with the increase in the oily sludgehydrochloric acid system volume in blended injection process, while it declines exponentially with the increase in the isolation slug volume in alternating slug injection process. The two modes are common in the fact that the permeability declines exponentially with the increase in the injection volume, which indicates more particle invasion. As a conclusion, the formation damage degree is well related to the reaction efficiency of oily sludge and hydrochloric acid, and the invasion depth is the main contribution to the formation damage.

Key words: carbon dioxide, oily sludge, porous medium, reaction efficiency, profile control, formation damage