Well killing composition. RU patent 2254454.

FIELD: oil and gas production.

SUBSTANCE: water-based composition that can be used for killing of well during pullout of hole and well remedial work as well as for temporary abandonment of well contains, wt %: carboxymethylcellulose3.5-4.5, sodium hydroxide1.5-2.0, copper sulfate 0.3-0.4, and methanol 4.0-16.0.

EFFECT: improved rheological properties of composition and increased lifetime of formed gels.

1 tbl

IPC classes for russian patent Well killing composition. RU patent 2254454. (RU 2254454):

E21B43/12 - Methods or apparatus for controlling the flow of the obtained fluid to or in wells (E21B0043250000 takes precedence;valve arrangements E21B0034000000)

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