FIELD: chemistry.
SUBSTANCE: invention relates to liquids for technical servicing of wellbore. Method includes introduction into wellbore liquid for technical servicing, which contains cationic polymer, mineralised solution and solid substance, and said cationic polymer has molecular weight from 300000 Daltons to 10000000 Daltons, mineralised solution is present in said liquid in quantity from 95 vol. % to 99.8 vol. % relative to its total volume, and solid substance represents weighting agent, selected from iron carbonate, magnesium carbonate, calcium carbonate or combinations of iron barite, hematite, ilmenite and carbonate, magnesium carbonate and calcium carbonate, with said liquid demonstrating reduction of shear viscosity at shear rate from 3 sec-1 to 300 sec-1 and temperature from 24°C (75°F) to 260°C (500°F). Composition of liquid for technical servicing of wellbore contains cationic polymer, mineralised solution and solid substance, with said cationic polymer having molecular weight from approximately 300000 Daltons to 10000000 Daltons, mineralised solution is present in said liquid in quantity from 95 vol. % to 99.8 vol. % relative to its total volume, and solid substance represents weighting agent, selected from iron carbonate, magnesium carbonate, calcium carbonate or combinations of iron barite, hematite, ilmenite and carbonate, magnesium carbonate and calcium carbonate, with said liquid demonstrating reduction of shear viscosity at shear rate from 3 sec-1 to 300 sec-1 and temperature from 24°C (75°F) to 260°C (500°F). Invention is developed in dependent items of formula.
EFFECT: improvement of liquid for technical servicing of wellbores.
20 cl, 9 ex, 9 tbl, 10 dwg
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