FIELD: mining.
SUBSTANCE: group of inventions relates to oil production. Method of treating a carbonate formation to increase oil recovery includes dissolving 1-10 g of a solid chemical composition in 1 l of injected water with low salinity, having a total content of soluble solids of 0.4% or less, to obtain a liquid solution for extracting oil from carbonate formations, pumping said solution into said formation to facilitate oil extraction. Said solid chemical composition contains, wt.%: polyhalite 70-94.9; NaCl 5-29.9; SiO2 0.1-5.
EFFECT: increasing oil recovery from the formation.
7 cl, 19 dwg, 20 tbl, 3 ex
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RU2826753C1 |
