Bioenzyme Chemical Oil Displacement Technology in Low Permeability Oil Fields
The development of low-permeability oil fields faces challenges such as low efficiency of traditional oil production technology and environmental pollution.Bioenzyme chemical oil flooding technology has attracted much attention because of its environmental protection and high efficiency.However,its applicability and stability in low-permeability oil fields require further research.In this paper,a systematic experimental study on these issues was carried out.First,through the optimization of different types of biological enzymes,it was found that lipase exhibited the most significant oil displacement effect at different mass concentrations.The optimal mass concentration was 2.0 g·L-1,which could increase the oil recovery rate to 24.5%.Secondly,the stability of lipase under high salinity and alkaline conditions was evaluated,and it was found that lipase could still maintain high oil displacement effect under appropriate mass concentrations,but its activity was inhibited under extreme conditions.Finally,it was found that lipase could effectively reduce the surface tension of crude oil.When the mass concentration was 2.0 g·L-1,the surface tension of crude oil was reduced to 37.9 mN·m-1.
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