The information stated herein is provided free and is based on technical information which Polyex company considers to be reliable. This information is meant for the qualified specialists and should be used under their own responsibility. As no control can be exercised over its use, we cannot be held responsible for any damage which may result from its misuse.

WELL ACIDIZING COMPOSITION FOR

OIL & GAS PRODUCTION WELLS FLUXOCORE® 210 TU 2122-075-5301222-2009

Purpose of Use

HCl-based acidizing compositions of FLUXOCORE® 210 brand are available in the following grades: grade О, grade R and grade C. FLUXOCORE® 210 grade О and FLUXOCORE® 210 grade R res used for the stimulation of oil & gas production wells with carbonate reservoirs and clayey terrigenous reservoirs with low permeability as well as for acidizing with the large amounts of acidic composition.

FLUXOCORE® 210 grade C is used as a basic composition for self-diverting acidic composition with gelling agent SURFOGEL® grade A.

Acidizing packages of FLUXOCORE® 210 type are HCl-based compositions with a special complex of surfactants, highly effective additives and inhibitors.

Application Area of FLUXOCORE®210 grade О and grade R

Fresh well completion after drilling operations in carbonate and sandstone reservoirs; switching into other production horizons and well development after conservation and temporary nonoperation.

Acidic fracturing with flow-diverting emulsion containing emulsifier EKS-EM / EMITRIT®.

Enhancing oil and gas recovery in production wells with water cut up to 60%, which have reduced productivity due to precipitation of non-organic type and due to oil-in-water emulsion forming.

Acidizing compound FLUXOCORE® 210 grade O and grade R can be used for highly drowned oil and gas production wells (watering level higher than 70%) after temporary blockage of high-permeability zones via prior injection of hydrocarbon emulsions with emulsifiers EKS-EM (for formation temperatures under 70°C)/

EMITRIT® (for formation temperatures under 100°C).

In case the level of watecut is 80-90% the blockage of water influx into the well can be performed with the

sediment forming composition EMCO / TAMOLEX ® . After water influx blockage well acidizing with FLUXOCORE® 210 grade O and grade R compound is performed. Properties of FLUXOCORE® 210 grade O and R

FLUXOCORE® 210 Grade O Grade R

Appearance Liquid, varying from colorless to brown

Mass concentration of acid, %, in the range of

18-22 10.5-14.5

Specific gravity at 20°C, g/cm3, not less than

1.09-1.11 1.04-1.08

St3 steel corrosion rate at 20 °С, g/m2⋅h,

not more than 0.20 0.20

Customer Benefits of FLUXOCORE®210 grade О and grade R

Low reaction speed for carbonates which provides deep penetration into the reservoir.

Stabilizing of ferrous ions in dissolved state on dissolving iron-bearing rocks and precipitates.

Effective prevention of forming trice oil-and-acid emulsions with high-viscosity.

High permeability in rock porous area of the reservoir due to low oil-water inter-phase tension, high surface activity.

High dissolving power for the salts and oil hydrocarbons.

High dispersive power for asphalt paraffin and resin deposits.

Low corrosion activity.

High dispersive power for clays.

Consumption Rates & Process Technique

Acidizing composition FLUXOCORE® 210 grade O and grade C are supplied in the concentrated form. The working solutions are to be prepared at site right before the starting of operation. The usual dilution rate is 1:1. The concentrates are diluted with fresh water. Acidizing composition FLUXOCORE® 210 grade R is ready to use product.

The consumption of the working solution of FLUXOCORE® 210 grade O and grade R is about 0.6 m3 per 1 m of perforation at well development after drilling, 1.2 m3 per 1 m of oil-saturated formation for EOR acidizing and 2-3 m3 per 1 m of oil-saturated formation for large volume acidizing in production wells.

To select the optimal design of application, i.e. consumption of acidizing compound, technique of application, it is recommended to contact the specialists of sales and service department of Polyex company.

Packing

Acidic compounds of FLUXOCORE® 210 brand are supplied in PE containers with capacity of 200 liters and PE containers with capacity of 1m3. It is also allowed to use specialized steel rubberized railway cisterns and highway tank trucks.

Complex acidizing compositions of FLUXOCORE® 210 brand are certified for the application in oil-and-gas field.