FIELD: oil and gas industry.
SUBSTANCE: invention can be used in construction and operation of wells subjected to stress mechanical loads on a cement ring. Composition of self-healing cement system contains water, backfill cement, complex additive and the rest, selected from such components as setting retarder, expanding additive, water loss reducer, silicon dioxide, lightening additive, antifoaming agent, microcement, dispersant. Complex additive includes styrene-isoprene-styrene copolymers, fine styrene-butadiene-styrene with content of particles less than 100 mcm and linear and/or branched styrene-butadiene-styrene.
EFFECT: prevention of formation of cracks-channels with risk of cross-flows due to formation of cracks-channels during drilling and operation of wells in conditions of different temperatures.
2 cl, 6 tbl, 3 ex
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