GROUTING COMPOSITE FOR CASING CEMENTING JOBS IN CONDITIONS OF NORMAL AND LOW TEMPERATURE (VERSIONS) Russian patent published in 2015 - IPC C09K8/467 

FIELD: oil and gas industry.

SUBSTANCE: according to the first version grouting composite contains oil-well Portland cement, water and additive that includes chlorine-containing setting accelerator, at that the composite contains sodium chloride and lithium carbonate as the additive with the following ratio of components, weight parts: Portland cement 100, sodium chloride 1.2-4.05, lithium carbonate 1.6-5.4, water 50-52, at that sodium chloride and lithium carbonate are taken in mass ratio 3:4 respectively and according to the second version the composite contains as the additive sodium chloride and biopolymer - reagent based on xanthane gum, at that sodium chloride and the above biopolymer are taken in mass ratio 10:1 respectively.

EFFECT: reduced setting time in conditions of low and normal temperature at simultaneous reduction of thickening time and increased flexural and compression strength at break in the same conditions.

3 cl, 2 tbl