FIELD: oil and gas production.
SUBSTANCE: invention relates to plugging materials for cementing oil and gas wells, in particular to installation of cement bridging in cases of conservation and abandonment of wells under complicated geological and technical conditions and in presence of permafrost requiring elevated reliability in isolation of boreholes. Expandable plugging material containing Portland cement (86-89%), gypsum (2-7%), and hydrocarbo-aluminosilicate material (2-7%) additionally contains 0.1-0.2% plasticizer (S-3) and 0.2-0.4% fluid loss reducer, namely sulfacell, carboxymethylcellulose, or complex reagent PS.
EFFECT: increased strength of cement stone and its adhesion to casing, improved sealing and isolating capacity during installation of cement bridging, stabilized expansion, and achieved required degree of spreading.
2 cl, 1 tbl
| Title | Year | Author | Number |
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