FIELD: oil and gas industry.
SUBSTANCE: cement composition for repair and isolation in oil and gas wells includes aqueous solution of magnesium chloride MgCl2 and caustic magnesite MgO. The composition contains additionally phosphogypsum with the following ratio of components, wt %: magnesium chloride - 18-36; caustic magnesite - 30-45; phosphogypsum - 0.4-2; water - the remaining share.
EFFECT: increased setting time.
2 cl, 1 tbl
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