HYDROGEN SULPHIDE RESISTANT SEALING INHIBITED GROUTING MORTAR Russian patent published in 2016 - IPC C09K8/467 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to fastening of casings during construction of wells, installation of insulation and elimination bridges during well workover and elimination of wells in conditions of hydrogen sulphide aggression and abnormally high reservoir pressures at temperatures of up to 120 °C. Hydrogen sulphide resistant sealing inhibited cement slurry comprising binder of portland cement, fine binder “Mikrodur”, fine ground silica sand, polymethylene naphthalene sulphonate - superplasticizer C-3, nitrilotrimethylene phosphonic acid NTF, ethyl silicate, surfactants sulphanol, weighting barite, mixing liquid further comprises an inhibitor of trioxane, from fine oil soluble butadiene-styrene rubber SCS, diesel fuel, with following ratio of ingredients, wt%: 56.34-46.51 portland cement, fine binder “Mikrodur” 1.4-32, fine ground silica sand 2.8-4.65, polymethylene naphthalene sulphonate - superplasticizer C-3 0.14-0.23, 0.06-0.09 NTF nitrilotrimethylene phosphonic acid, ethyl silicate 1.12-1.86, 0.14-0.23 sulphanol surfactants, weighting barite 5.6-9.29, liquid mixing 31.0-32.5, inhibitor trioxane 0.28-0.46, fine ground oil-soluble styrene-butadiene rubber SCS 0.56-0.93, 0.56-0.93 diesel. Mixing fluid is water or brine of sodium chloride or calcium density from 1.0 to 1.35.

EFFECT: technical result is to increase stability of oil-well in stone sour at elevated temperatures and pressures and giving it properties of chemically resistant element.

2 cl, 1 tbl