CDX Compact Deoxygenation System

Effective removal of oxygen from seawater to minimize corrosion

Oil and gas field development is moving to new frontiers, including deeper waters offshore. Operators are expected to make greater use of enhanced oil recovery (EOR) techniques, including seawater or controlled-salinity water injection.

Because downhole tubing is mostly composed of unlined carbon steel, it is highly susceptible to corrosion from oxygenated seawater. Injection pipelines face similar issues. Therefore, it is essential to remove this oxygen from seawater that is to be injected for EOR operations. 

Traditional processing equipment has included vacuum and gas-strip deaeration. Recognizing the need for more compact, lightweight, and robust equipment, we have developed the CDX compact deoxygenation system. 

To safeguard the CDX system from potential inorganic and organic fouling, pretreatment of the seawater with a membrane separation process is required. The system can employ the Polymem UF seawater ultrafiltration system or our sulfate removal system.


  • The CDX system uses a chemical reaction process employing a catalyst, as opposed to a mass transfer process, which employs a packed tower. This leads to a reduction in height, space, and weight, together with a reduced chemical requirement.
  • The system achieves single-digit parts-per-billion oxygen and chlorine outlet concentration without the need for scavenging chemicals.
  • System operation at pressures a minimum of 4 bar above atmospheric pressure provides the potential elimination of booster pumps.
  • The only utility requirements for the CDX system are power and potable water.
  • Because the system employs a small reaction vessel rather than a tower, it can be designed to fit between decks, meaning a simpler facility design and the elimination of deck penetrations.
  • The system operates flooded, eliminating dynamic motion performance issues and any antifoam requirements.

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Advances in Seawater Injection Technology

Deaeration technologies demonstrates the compact form of the CDX.
Multi-organizational teams collaborate to develop a more compact and efficient deoxygenation system.
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