Abstract
To avoid corrosion in water injection tubing, it is necessary to remove oxygen from the source water. Traditional processing equipment has included vacuum and gas-strip de-aeration. Cameron has developed a Compact De-Oxygenation System ("CDX™") technology as a reduced height, light weight alternative. The system injects and dissolves hydrogen into the oxygen rich feed-water before it passes over a catalyst bed, where the hydrogen and oxygen react to produce water and a deoxygenated stream of seawater.
The process has been successfully demonstrated at Galveston, Tx. A 25m3/h demonstration plant was run on high total suspended solids seawater over a period of 6 months. Outlet dissolved oxygen concentrations were in the order of 2.5µg/l (ppb).
The performance of key components of the system is described, including: ultrafiltration membrane pre-treatment under extreme solids loading, the hydrogen generator, mixers and catalytic reactor.
Compared with alternative de-aeration systems, the system offers significant benefits including reduced height, compact packaging, elimination of oxygen without the use of chemicals and pressurized operation.
The paper focuses on the demonstration plant build and testing. Lessons learned throughout the execution of this medium horizon project are presented.
The system is being offered commercially and will be integral to the new designs of water injection system required for future project developments and retrofits.
