REAGENT FOR ISOLATING STRATAL WATER INFLOW Russian patent published in 2008 - IPC C09K8/508 

FIELD: chemistry.

SUBSTANCE: invention pertains to reagents for isolating inflow of stratal water. The reagent is obtained by mixing in situ, two water solutions, one containing sodium salts of a polybasic acid, and the other containing a mixture of chloride salts. One of the solutions in form of the indicated sodium salts contains the following, in wt % of solid substance: sodium phosphate 10-20, sodium carbonate 40-50, sodium oxalate and an extra polymer additive 10-20. The mixture has a ratio of 1:1 between carboxymethylcellulose and xanthane gum, produced by fermentation of Xanthomo and Campestrim bacteria strains in a carbon medium. The other solution in form of chloride salts contains the following in wt % of solid substance: calcium chloride 40-50, copper chloride 15-25 and aluminium chloride 30-40. The above mentioned solutions are used in ratio of 1:1 with concentration of 1-5 wt %.

EFFECT: reduced permeability of water intervals of strata with the aim of redistributing filtered streams and more efficient isolation of stratal water inflow using precipitate forming reagents.

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