HEAVY WELL-KILLING LIQUID WITHOUT SOLID PHASE WITH A DENSITY OF UP TO 1450 kg/m3 Russian patent published in 2022 - IPC C09K8/506 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of completion and repair of producing and injection oil and gas wells, can be used to carry out well kill operations at productive formations with abnormally high reservoir pressure. The heavy well-killing liquid with a density of up to 1450 kg/m³ without solid phase for completion and repair of oil and gas wells contains, wt. %: water 51.10-62.65; anhydrous Premium grade calcium nitrate 24.09-36.83; sodium chloride 11.72-12.88; salt deposition inhibitor DESCAVENT 0.345-0.379. Heavy well-killing liquid with a density of up to 1450 kg/m³ without solid phase for completion and repair of oil and gas wells contains, wt. %: water 51.28-62.84; anhydrous calcium nitrate of the Premium brand 24.09-36.83; sodium chloride 11.72-12.88; winter aqueous solution of surfactants and mixtures of monatomic and polyatomic alcohols “Sulfen-35” 0,172-0,189.

EFFECT: increase in the efficiency of well-killing, preservation of reservoir properties of productive formations, prevention of sedimentation and safety when using well-killing lliquid.

1 cl, 4 tbl