Mechanism and Experimental Study of Deep Profile Control Chemical Agent for Oil Recovery
A chemical oil displacement agent HPEN system was synthesized based on molecular design and chemical reactions,and the sensitivity of factors such as catalyst dosage,reaction temperature,reaction time,and feed ratio to reaction yield was analyzed.The synthesis conditions of HPEN were optimized through orthogonal design,and the oil displacement characteristics of the HPEN sulfonate complex system were evaluated through core displacement experiments.The target block was selected for on-site application experiments.The results showed that the synthesis conditions of HPEN were as follows:catalyst dosage of 5%,reaction temperature of 100℃,reaction time of 6 h,and feed ratio of 1∶1.5.The presence of inorganic salt ions could affect the interfacial tension of the HPEN solution system to varying degrees.The best effect was achieved when 1.0%HPEN was mixed with sulfonate at a ratio of 3∶1.At this time,the system had a temperature resistance of 130℃,and the interfacial tension of the high salinity solution system was still in the range of 10-2 mN·m-1.The composite system could significantly improve the on-site crude oil recovery rate,achieving an average daily oil production of 4 t and a daily liquid production of 16 m3 in old wells.
Deep profile controlChemical agentsOil displacement mechanismRecovery ratio
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