EXPANDING PLUGGING COMPOSITION Russian patent published in 2014 - IPC C09K8/467 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed composition comprises grouting cement, fine inorganic additive, hydroxyethylcellulose, sodium or potassium chloride and water at the following ratio of components, wt %: grouting cement - 75.0-85.0, fine inorganic additive - 15.0-25.0, hydroxyethylcellulose - 0.3-0.6, sodium or potassium chloride - 5.0-10.0, water - 45.0-55.0. Said fine inorganic additive represents commercial fine natural chalk or ground dust-like quartz or fine siliceous filler Said hydroxyethylcellulose represents nonionic grades like "Натросол" 250 GXR, or "Натросол" 250 MX, or "Натросол" 250 EXR.

EFFECT: higher isolation properties plus lower contraction.

3 cl, 1 ex, 1 tbl