Deinvert

Detergent composition, asphaltene precipitation eliminator

(TU) 2458-016-14023401-2012

Detergent composition, asphaltene precipitation eliminator Deinvert is a composition of surfactants in an alcohol solvent. The reagent is designed to remove oil and asphaltene precipitation, decompose emulsions and prevent their formation in rock pores, as well as to remove residual oil from reservoir.
DeInvert detergent composition, asphaltene precipitation eliminator is delivered in 200 kg barrels.

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Physical and chemical properties

Property

Standard

Appearance

Liquid of light yellow to dark brown color

Density at 20 °C, g/cm3

0.9-1.1

pH of 2.5% water solution

9.0-13.0

Freezing point, °C, max

-30

Recommendations to application

DeInvert is used as a complex additive for operating fluids at any stage of operations. Standard dosage is 0.5-4.5%. Detailed dosage is determined individually. To restore well operational capability and commission after killing with water-in-oil emulsion, it needs washing with a 5-6% solution of DeInvert composition. The washing solution is pumped into formation zone under pressure of 35 to 40 atm. without regard to hydrostatics. It is then left for 1 to 3 hours to react. Pressure dropdown almost to the hydrostatic values indicates the decomposition of the blocking emulsion screen. Amount of the washing solution is 20 to 30% based on volume of injected emulsion.