COMPOSITION OF POLYSACCHARIDE GEL FOR KILLING OF HIGH-TEMPERATURE WELLS Russian patent published in 2013 - IPC C09K8/42 

FIELD: oil and gas industry.

SUBSTANCE: composition of polysaccharide gel for killing of high-temperature wells contains fresh or mineralised water, polysaccharide thickener, cross-linking agent - chrome acetate with magnesium oxide; in addition, it contains calcium chloride added after the rest components in the quantity of 112-145 g per litre of fresh water or 47-73 g per litre of mineralised water with density of 1.12 g/cm³ at the following component ratio, wt %: polysaccharide thickener 0.8-1.2, chrome acetate 0.05-0.1, magnesium oxide 0.04-0.08, calcium chloride 10-12.5, fresh water is the rest, or polysaccharide thickener 0.8-1.2, chrome acetate 0.05-0.1, magnesium oxide 0.04-0.08, calcium chloride 4-6, mineralised water with density of 1.12 g/cm³ is the rest.

EFFECT: increasing the killing efficiency of wells developing high-temperature formations, or which are effected with steam and heat.

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