EXPANDING BACKFILL SOLUTION WITH CONTROLLED PROPERTIES Russian patent published in 2012 - IPC C09K8/467 

FIELD: oil-and-gas production.

SUBSTANCE: expanding grouting mortar comprises tempering fluid, water, and base consisting of Portland cement, filtration index reducer, i.e. hydroxyethylcellulose, polycarbonate as plasticiser, defoaming agent, expanding additive, accelerator of thickening and cementation, i.e. calcium chloride. Note here that said base additionally comprises silica-alumina pozzolanic admixture, i.e. meta white clay, while expanding additive is represented by product of combined grinding of blast-furnace slag and quicklime ''ДРС-НУ'' of average chemical composition, in wt %: CaO+MgO - 72-93; SiO₂ - 7-23; Al₂O₃ - 0-4; Fe₂O₃ - 0-2.5; other impurities - 0-4.5; base as defoaming agent comprises polyglycol "ПЛАСТЭК ПГ-07", at the following ratio of components, in wt %: Portland cement - 91.8-94.2, hydroxyethylcellulose - 0.15-0.3, said plasticiser - 0.2-0.3, said expanding additive - 3.0-5.0, defoaming agent - 0.01-0.03, meta white clay - 0.5-2.0, calcium chloride - 0.5-2.5, while water content in solution allows water-to-base ratio of 0.48-0.64.

EFFECT: higher grouting capacity due to higher flowability, low filtration, increased expanding ability.

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