Well Acidizing Package KSPEO-2N For Injection Wells

Technical Requirements TU 2122-056-53501222-2006

Purpose of Use

Complex acidizing package KSPEO-2 grade N (further referred as KSPEO-2N) is designed for the efficient treatment of injection wells in carbonate reservoirs with injection of water of any type and for wells in sandstone reservoirs with injection of produced water or waste water.

Acidizing package KSPEO-2 N is HCl-based compound in which special complex of surfactants, corrosion inhibitors and modifying  agents is added.

Application Area

  • Enhancing injectivity in injection wells in carbonate and sandstone reservoirs, especially when the injectivity was negatively influenced by formation plugging with rust precipitation, suspended solids in injected water, precipitation formed as a result of incompatibility of salts in injection fluids and in formation waters, as well as by the products of vital activity of bacteria.
  • Fresh injection well development after drilling operations and re-start of the wells after conservation.
  • Conversion of production wells into injection wells.

Acidizing package KSPEO-2 N is designed for the efficient treatment of injection wells in carbonate reservoirs as well as for the wells in which brines or produced waters are injected. Acidizing package KSPEO-2 N can be pumped as a spacer before the acidic treatment of the well with acidizing package KSPEO-4 N. Package KSPEO-4 N is designed for the wells in sandstone reservoirs with high permeability.

Acidizing treatment with KSPEO-2 N can be combined with different physical methods of injection well treatment such as hydroimpulsive, vibrowave, acoustic, etc. impact.

For the injection wells where produced water with high content of hydrocarbons is injected as well as for the production wells converted to injection wells it is recommended to add modifier MK-R to the package KSPEO-2 N. Modifier MK-R contains some solvents. For the additional information see release bulletin on MK-R.

Customer Benefits

  • Low reaction speed for carbonates, which allows deep penetration of the compound into the formation.
  • Ability to stabilize ferric-ions in diluted state  when dissolving ferruginous rocks and precipitates.
  • High permeability in rock porous area of the reservoir due to low inter-phase tension between oil and KSPEO compound.
  • Dissolving power for salts and hydrocarbon.
  • High dispersive power for clays.
  • Low corrosiveness.

Complex action of  KSPEO-2 N package with MK-R  provides effective cleaning of the payzone from the hydrocarbons and from other matters suspended in produced water or waste water being injected.

Process Technique

Acidizing package KSPEO-2 N is supplied in concentrated form. The working solution is to be prepared at site before the start of operation. Concentrated compounds are diluted with  fresh water with the ratio 1:1 by volume.

The working fluid is injected into the well with average consumption of 0,6 m3 per meter of perforated zone during well drilling and about 1,5 m3 of fluid per meter of perforated zone of the reservoir in the wells under operation.

To select the optimal design of application, i.e. consumption of acidizing compound, technique of application, it is recommended to contact the specialists of Service & Sales Department of Polyex company.

Complex acidizing package KSPEO-2 N is certified for the application in oil-and-gas field.


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