FIELD: mining.
SUBSTANCE: invention relates to the field of construction of oil and gas wells, in particular to compositions of heat-insulating backfill materials intended for fixation of casing strings in intervals of occurrence of perennial frozen rocks. Heat-insulating backfill material contains, wt.%: no-additive backfill portland cement “ПЦТ”-I-G 8.6-11.2; micronised backfill portland cement "Ultracement-5" 38.3-47.6; hollow glass microspheres "ForeSphere-3000" 5.7-8.4; expanding additive Policem “ДР-50” 6.2-7.4; monoethylene glycol 5.4-6.9; polycarboxylate plasticiser 0.34-0.48; water – balance.
EFFECT: reduced risk of complications caused by thawing of perennial frozen rocks, ensuring reliability of well support structure, effective sealing of annular space, preservation of wellhead and near-shaft space during the whole cycle of their construction and operation in conditions of permafrost rocks.
1 cl, 1 tbl, 1 ex
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