FIELD: oil and gas industry.
SUBSTANCE: invention relates to oil industry, namely to development of oil fields by using water flooding. Composition for displacement for pumping into a mudded-off oil formation comprising a nonionic surfactant - NIS N-alkyl-N, N-di(polyethylene glycol) amine based on coconut oil acids oxamine L-15 and water, additionally comprises a cationic surfactant - CS alcohol alkyldimethylbenzylammonium chloride C12-C14, with the following ratio of components, mass%: NIS - 0.01-0.5; CS - 0.1-0.5; water - balance. In addition, the formulation has bactericidal properties and is a corrosion inhibitor.
EFFECT: technical result is decreased interfacial tension at the oil-water boundary, decreased degree of swelling of clay minerals, and ultimately more efficient displacement of oil from the mudded-off oil formation.
1 cl, 1 dwg, 2 tbl, 3 ex
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