FIELD: oil and gas production.
SUBSTANCE: lightened invert dispersion designed for boring, killing, and repairing wells with abnormally low formation pressure contains hydrocarbon liquid (13.9-25.0%), water phase (70.0-15.0%), surfactant (0.1-1.2%), and lightening hollow microspheres preliminarily hydrophobized with oil- and/or water- and oil-soluble surfactants (15.0-40.0%). In addition, dispersion includes vegetable or petroleum oils (1.0-20.0%), including exhausted oils. Lightening hollow microspheres are gas-filled aluminosilicate, glass, or polymer microspheres, or mixtures thereof. Preferably, as vegetable oils, dispersion contains rapeseed, sunflower, and corn oils, or mixtures thereof, and, as petroleum oils, motor, industrial, and other oils, or mixtures thereof, including exhausted oils.
EFFECT: improved quality of lightened invert dispersions at lower concentration of surfactant and hydrocarbon solvents, and enlarged assortment of suitable hollow microspheres.
3 cl, 1 tbl, 22 ex
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