FOAM-CEMENTING PLUGGING MATERIAL FOR BOREHOLES FIXATION Russian patent published in 2017 - IPC C09K8/467 C04B28/04 C04B22/08 C04B38/10 C04B24/16 

FIELD: oil and gas industry.

SUBSTANCE: foam-cementing plugging material for boreholes fixation contains portland cement, hardener, hydroxyethyl cellulose, Howco Subs and water, wherein Howco Subs contains hydroxyethyl alcohols with a degree of hydroxyethyl 6-12 and the number of methylene groups 10-20 and the hardener - calcium nitrate, or calcium nitrite or calcium formate, besides, the material additionally contains the plasticiser - water-soluble sodium or calcium salts of sulfonated polycondensation products of naphthalene with formaldehyde or a water-soluble sodium or calcium salts of sulfonated polycondensation products of melamine with formaldehyde, with the following components ratio, wt. h: portland cement 100, hardener 1.0-3.0, hydroxyethyl cellulose 0.2-0.4, the mentioned Howco Subs 0.2-0.3, the mentioned plasticiser 0.2-0.3, water 45.0-48.0.

EFFECT: improved performance of foam-cementing plugging material and improving the manufacturability of its use, obtaining of strong and durable foam-cementing contact with the rock and the casing string over the entire cementing range by improving the strength characteristics of the foam-cementing and improvement of its homogeneity, reduction of rheological and filtration properties of the foam-cementing solution, reduction of the hardening time, low corrosive activity of foam-cementing material.

5 cl, 3 tbl, 1 ex