Interfacial properties and component separation of imbibition agent in low permeability reservoir
The interfacial tension test of the imbibition compound of petroleum sulfonate WPS-D and dode-cyl dimethyl betaine showed that the imbibition compound with 0.3％concentration of 8:2 easily reached the ultra-low interfacial tension(＜1.0 × 10-3 mN/m),and the systems with 0.4％and 0.5％concentra-tion of 9:1 approached the ultra-low interfacial tension.The components of petroleum sulfonate WPS-D were separated by preparative chromatography and mass spectrometry,and the interfacial activities of dif-ferent components were investigated by interfacial tension test.The results showed that 5 different compo-nents with different structure and composition were separated by petroleum sulfonate.C17～C19 Alkyl ben-zene sulfonates reached ultra-low interfacial tension and maintained,and C18～C24 alkyl benzene sulfon-ates rebounded after close to ultra-low interfacial tension.It is concluded that the main component provi-ding interfacial activity is C17～C19 sulfonates.
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