FIELD: oil and gas industry.
SUBSTANCE: composition for displacing oil from formations and selectively limiting water inflows contains, wt.%: sodium chloride – 16.5-18.0; technical sodium lignosulfonate – 9.5-10.0; Neftenol-VKS – 5.0-7.0; Neftenol-GF – 0.5-3; oxyethylidene diphosphonic acid – 2.0; water – balance.
EFFECT: improved efficiency of displacement of residual oil by isolating highly permeable zones of the oil reservoir, reducing surface tension at the oil-water phase boundary, and increasing the coverage of reservoir rock by displacement.
1 cl, 3 dwg, 1 tbl
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Authors
Dates
2024-01-11—Published
2023-04-05—Filed