Foam oil-displacing agent suitable for high-salinity low-permeability oil reservoir, preparation method and application thereof

• Main Authors: HAN HONGCHANG, HUANG ZHOU, HE YINGLAN, GU YUE, ZUO ZHONGHUA, PENG PENG'AO, CHEN ZHUO, LIU YONG, ZHOU MING, LI YI
• Format: Patent
• Language: Chinese; English
• Published: 18.02.2022
• Subjects: ADHESIVES; CHEMISTRY; DYES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MINING; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PAINTS; POLISHES

The invention provides a foam oil-displacing agent suitable for high-salinity low-permeability oil reservoir. The foam oil-displacing agent is prepared from the following components in percentage by weight: 0.4-0.6% of tris [(N-dodecyl-N-ethyl-N-sodium carboxymethyl)-2-ammonium bromide ethylene] amine, 0.1-0.35% of dodecyl dimethyl amine oxide, 0.02-0.07% of sodium salicylate, 0.04-0.14% of a chelating agent, 6-10% of inorganic salt and the balance of water. The invention also provides a preparation method and application of the self-assembled carbon dioxide foam oil-displacing agent with ultralow interfacial tension. According to the invention, the self-assembled carbon dioxide foam oil-displacing agent is good in salt resistance, acid resistance and alkali resistance, foaming liquid has high viscosity, the strength and stability of a foam interfacial film are improved, the oil-water interfacial tension reaches 10<-3 > mN/m order of magnitude and below, foam generated by experiments is fine and rich, the inj