FIELD: chemistry.
SUBSTANCE: claimed invention is aimed at creation of composition for cleaning formation in oil extraction. Composition of cleaning formation in oil extraction contains expandable polymer particles, which have anionic sections, and are linked with labile cross-linkers and stable cross-linkers, where said particles are combined with liquid and cationic cross-linking agent, capable of additional cross-linking of particles in case of degradation of labile cross-linker with formation of gel, in which said anionic section is selected from the group, consisting of polymerisable carboxylic acids and sodium, potassium and ammonium salts, and said cationic cross-linker is represented, at least, by one agent, selected from the group, consisting of Cr3+ Fe3+ Al3+, Ti4+ Sn4+, Zr4+ or their salts, their complexes or nanoparticles, which contain them, chelated cations of said metals or polyethylenimine (PEI). Also claimed is version of composition and method of increasing production of hydrocarbon liquids from underground oilfield.
EFFECT: polymer-containing compositions provide good resistance to flow with time, providing long-lasting effect of processing.
15 cl, 2 dwg, 2 ex
