VWS Westgarth Office Contact

Orbital House
3 Redwood Crescent
East Kilbride
G74 5PR

+44 (0)1355 588 000
Fax: +44 (0)1355 588 001


Veolia Water Oil & Gas Angola Contact:

Centro Logistico de Talatona
Via C3A Sector de Talatona
Gleba GU - No. 4278 
Andar - RC - No./Letra
Belas - Luanda
República de Angola

Tel: +244 222 711 799


Sulphate Removal Package

Sulphate Removal Package (SRP)

P57 (231,700 BPD)

Where oilfield reservoir formation water contains significant amounts of barium and/or strontium, injection of seawater can cause barium and strontium sulphate scale to be formed. These scales have the effect of reducing reservoir permeability and can also become deposited in production pipe internals. Barium and strontium sulphate scales are notoriously difficult to remove since they cannot be easily dissolved. Squeeze inhibition treatments are often utilised to improve the well permeability but these are extremely difficult to control and cannot be applied to complex sub-sea networks or from floating production storage and off-loading vessels (FPSO). Where pipeline scaling is experienced, this has to be removed by mechanical means.

As an alternative to the above, the installation of a Sulphate Removal Plant (SRP), to extract the sulphates from the seawater prior to injection, is often seen as the most economical approach. The SRP uses nano-filtration membranes (FilmTec™brand SR-90 MEMBRANE ELEMENTS) to remove the sulphates while leaving the other salts (sodium, chloride etc.) substantially unaffected, thus maintaining the stability and permeability of the formation clays. The Marathon Oil Company, using membranes supplied by Dow Chemical Company, invented the process. To find out more about the sulphate removal process, view our Sulphate Removal and Water Injection brochure.

Benefits of Sulphate Removal

Membrane pressure vessels
  • Reduces seawater ion concentration from around 2,500 ppm to less than 50 ppm (at temperatures of < 24ºC).
  • Significantly reduces sulphate scale precipitation in production wells
  • Reduces the quantity of scale inhibitor required downhole and in topsides equipment
  • Eliminates economic and operational impacts resulting from scaling in reservoir
  • Increases productivity index by limiting pipe constriction due to scaling
  • Assists in maintaining reservoir permeability by limiting formation plugging caused by scaling
  • Prevents well souring by controlling sulphate reducing bacteria (SRB) which in turn reduces equipment corrosion problems and the equipment required for scrubbing, removal, and handling of hydrogen sulphide
  • Reduces safety hazards associated with hydrogen sulphide
  • Has an additional safety benefit by reducing scale and thus the potential of naturally occurring radioactive material which can be attached to the scale
  • Meets the stringent design and environmental criteria related to offshore platforms
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