PNP-1

Polyacrylamide

(TU) 2458-024-14023401-2012

Polyacrylamide PNP-1 is an anionic copolymer of polyacrylamide and sodium acrylate with molecular weight average. It is very soluble in water, and does not react with hydrocarbons and porous medium. PNP-1 is used for maintenance and workovers of oil and gas wells, in the technologies of oil recovery enhancement, where it ensures prolonged effect during polymer flooding, due to its retention of basic viscosity properties and capability to reduce water relative permeability of formation. The reagent is also used while carrying out water shut-off jobs, in operations on equalization of injectivity profile, in flow-deflecting technologies.
The PNP-1 polyacrylamide is delivered in 25 kg bags

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Physical and chemical properties

Property

Standard

Appearance

White or yellowish freeflowing powder

Granulometric composition: % of mass granules with size of more than 1,000 mkm, max

10,0

Bulk density, g/cm3

0,55 – 1,00

Flowability

Free discharge

Dynamic viscosity, mPas 0.5% solution in 10% NaCl solution

70-400

Solid residue mass part, %, min*

90,0

PAA solubility, minutes, max*:
in fresh water
in salt water

60
180

PAA gelling test in fresh water 85±5 °C, minutes, max*

* The property is measured under customer demand

Recommendations to application

• According to conventional technology of polymer flooding, a chemical plugo f the solution of the PNP-1 polymer is injected into formation with permanent concentration, the chemical solution plug, in its turn, is moved within the formation with brine water of the formation pressure maintenance system. The polymer content in the solution and the volume of the chemical plug may vary within a wide range.
• When preparing cross-linked compounds, depending on set goals, a water solution of PNP-1 of the 0.01-1% concentration is injected into a well, with the crosslinker (chromium acetate or chromium potassium sulphate) entered into it, with concentration of 0.005 to 0.1%.
• Due to selected concentration of the PNP-1 polymer and crosslinker it is possible to regulate the time of gel formation of the system and obtain the crosslinked system at a set point.
• The PNP-1 polyacrylamide is recommended to be used under 70 °С and lower formation temperature.