HEAVY WELL-KILLING LIQUID WITHOUT SOLID PHASE WITH A DENSITY OF UP TO 1600 kg/m Russian patent published in 2022 - IPC C09K8/42 

FIELD: mining industry.

SUBSTANCE: invention relates to the field of completion and repair of producing and injection oil and gas wells, can be used to kill productive formations with abnormally high reservoir pressure in order to perform various types of work in the wellbore. Heavy well-killing fluid without a solid phase with a density of up to 1600 kg/m³ for completion and repair of oil and gas wells is a solution containing water, anhydrous calcium nitrate of the Premium brand, a salt deposition inhibitor: nitrilotrimethylphosphonic acid, and additionally calcium chloride and an aqueous solution of surfactants and a mixture of monatomic and polyatomic alcohols “Sulfene-35” winter, or hydrophobizer IVV-1: an aqueous solution of a mixture of alkyldimethylbenzylammonium chloride and quaternary ammonium salt of tertiary amine, or hydrophobizer “Neonol BS-1”: a mixture of nonionic surfactants, alcohols, glycols and water at the following ratio of components, wt. %: water 40.84-62.83; anhydrous calcium nitrate of the Premium brand 18.48-29.50; calcium chloride 18.48-29.50; nitrilotrimethylphosphonic acid 0.0063-0.0076; “Sulfen-35” winter, or hydrophobizer IVV-1, or “Neonol BS-1” 0,156-0,189.

EFFECT: reduction in corrosion activity, a low freezing point of the prepared well-killing fluid, preservation of the reservoir properties of the productive reservoir, prevention of sedimentation, ensuring requirements for the content of the maximum permissible concentration of harmful substances in the air of the working area released during the preparation of the well-killing fluid, and reducing its preparation time.

1 cl, 3 tbl, 7 ex