FIELD: chemistry.
SUBSTANCE: invention relates to oil and gas industry and is meant for isolating formation water and eliminating thief zones of oil and gas wells. The polymer backfill composition contains the following in pts. wt: carbamide formaldehyde resin 100; acid hardener - silicofluoride acid or aluminium hydroxochloride 20-50; sodium nitrite 2.0-5.0; oil 10-20.
EFFECT: increased strength and time after which foaming begins.
1 tbl, 1 ex
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