WEIGHTED LIQUID WITHOUT A SOLID PHASE FOR KILLING OIL AND GAS WELLS Russian patent published in 2021 - IPC C09K8/42 E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry. The invention is intended for the repair of oil and gas wells and is used under conditions of abnormally high pressures for primary and secondary productive formation exposing, for killing and performing various types of work. A weighted liquid without a solid phase for killing oil and gas wells contains calcium nitrate, zinc chloride, a complex reagent (DON-A 0834), a gelling agent - polyanionic cellulose PAC-V, or xanthan gum, or carboxymethyl cellulose - and fresh or mineralized water. The components are mixed in accordance with the following ratio, wt. %: calcium nitrate - 10-60; zinc chloride - 10-60; complex reagent (DON-A 0834) - 0.25-0.5; gelling agent - 0.25-0.5; water - 29-29.5.

EFFECT: composition for the preparation of process liquids without a solid phase with a density of 1500 kg/m³ and up to 2000 kg/m³, which have admissible values of the corrosion rate and crystallization temperature. The invention makes it possible to use process liquids in the Far North. The composition can be made on the basis of both fresh and mineralized (reservoir) water.

1 cl, 2 tbl