This collection of frequently asked questions (FAQ) provides brief answers to many common questions about use of biocides and sulfide scavenger for oil & gas exploration.

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Which product types of BPR (Regulation (EU) No. 528/2012 ) have to be supported for oil & gas exploration?
  • Biocides for drilling purposes belonging to product type 12
  • Biocides for secondary oil recovery belonging to product type 11

Only offically approved biocides for the corresponding product type are allowed for usage within the European Community!

What kinds of impact on the corrosion rate of carbon steel biocides have?

Corrosion rate on mild steelUnder oilfield conditions we have tested THPS to increase the corrosion rate by 90% whereas grotan® WS decreases under the same conditions the corrosion rate by 40% and grotan® OX even by 90%.









Can we use biocides even below 0°C?

THPS, GDA and grotan® WS contain water, so they will freeze depending on the content of added alcohol. grotan® OX contains no water and is applicable even at temperatures below -30°C.

What is the shelf life of grotan® OX and grotan® WS?

Both products have a shelf life of 3 years. 

Are biocides compatible with oxygen scavenger?

Aldehyde based biocides such as THPS, GDA, as well as grotan® OX and grotan® WS are not compatible with oxygen scavenger like ammonium bisulfite. So to use this common oxygen scavenger you should first remove oxygen and in a second process add the biocide. If you can`t separate the volume to be treated we recommend our two-in-one product grotan® OS which contains a synergistic mixture of powerful oxygen scavenger and grotan® OX which are compatible.

Are biocides able to remove biofilms?

Thin biofilms will be dissolved depending on the concentration of the biocides. Thicker biofilms are more difficult to dissolve. Therefore we recommend our product grotanol® NOS which contains a biodegradable detergent in a powerful mixture to remove biofilms. Thick biofilms has to be removed first mechanically than flushed with grotanol® NOS and preserved with a biocide like grotan® OX or grotan® WS. 


Your direct contact

Dr. Michal Streek
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