FIELD: well repair. SUBSTANCE: fluid is used for well killing, perforating and reperforating in well completion and workover. EFFECT: reduced interfacial tension at boundary with kerosene down to 4-6 mN/m; provided lower percentage of clay moistening less than 3% for 4 h; multiply reduced rate of metal corrosion as compared with salt solutions; preserved cement stone from cracking that is attained with the use of filtrate of technical pentaerythrite as killing fluid for well repair at temperature not below minus 15 C. 8 tbl
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