FIELD: oil industry.
SUBSTANCE: invention relates to the composition of backfill cements and can be used for cementing deep wells in fields with active formation water and a tendency to water circulation behind the casing. The backfill includes 99.0-99.5 wt. % Portland cement and swellable polymer material. In this case, as a swellable polymer material contains 0.5-1.0 wt. % water-swellable granules in the form of water-insoluble crosslinked copolymers of acrylamide and potassium acrylate, coated with a water-soluble shell of carboxymethylcellulose modified with polyvinyl alcohol.
EFFECT: improving the efficiency of eliminating casing circulation and restoring the integrity of the cement ring without stopping the well for workovers.
1 cl, 2 dwg, 1 tbl
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