FIELD: chemistry.
SUBSTANCE: invention relates to composition of an additive used when cementing boreholes in the oil and gas industry. The polyalkylene imine-based and sulphonated additive contains formaldehyde and a condensation product, the condensation product being a sulphonated keton or formaldehyde resin. The additive can be used in opening, exploiting and completing underground deposits of oil and natural gas. The invention is developed in subclaims.
EFFECT: reduced water loss of materials with said additive used when cementing boreholes in the oil and gas industry.
15 cl, 3 ex
