Oil and gas production handbook An introduction to oil and gas production

TEG 
Triethyleneglycol (TEG) is used to dry gas (see the 
chapter on scrubbers and reboilers). 
Hypochlorite 
Hypochlorite is added to seawater to prevent growth 
of algae and bacteria, e.g., in seawater heat 
exchangers. Hypochlorite is produced by electrolysis 
of seawater to chlorine. In one variant, copper 
electrodes are used, which adds copper salts to the 
solution that improves effectiveness. 
Biocides 
Biocides are also preventive chemicals that are added 
to prevent microbiological activity in oil production 
systems, such as bacteria, fungus or algae growth. 

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