HEAVY KILLING FLUID WITHOUT SOLID PHASE WITH DENSITY OF UP TO 2,100 kg/m Russian patent published in 2024 - IPC C09K8/42 C09K8/48 

FIELD: oil and gas industry.

SUBSTANCE: invention is intended for completion and repair of injection and production, oil and gas wells, can be used in conditions of abnormally high formation pressures, in conditions of low temperatures of the Far North, primary and secondary opening of productive formations, for killing and performing various types of works during their repair. Heavy killing fluid with density of up to 2,100 kg/m³ includes 1.10–28.76 wt.% calcium chloride, 1.10–28.76 wt.% of anhydrous calcium nitrate of "premium" grade, 1.37–52.48 wt.% of zinc bromide, 0.43–16.57 wt.% of calcium bromide, 0.21–0.28 wt.% of corrosion inhibitor "ITPS-508 Grade B", 0.26–0.34 wt.% of water repellent "IVV-1" or a composite mixture of nonionic surfactants, alcohols, glycols and water—"Neonol BS-1" as a surfactant, water—the rest.

EFFECT: development of heavy killing fluid without solid phase with density of up to 2,100 kg/m³, easy to prepare, requiring no heating for dissolution of components, with concentration of components providing the declared density, minimum negative impact on the bottomhole zone of production and injection wells, having simultaneously low corrosive activity (up to 0.12 mm/year), low crystallisation temperature (below minus 35 °C), which enables its use in conditions of low temperatures of the Far North.

2 cl, 3 tbl, 10 ex