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Roemex Limited spacer Speciality Oilfield Chemicals spacer Sulphate Reducing Bacteria spacer Microbial contamination spacer Breakthrough and crude oil / water storage vessels spacer
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preheadingBacterial Control

Inroduction
Problem Area
sub SCALE
sub CORROSION
sub DEMULSIFIERS
sub DEOILERS
sub WAX
sub ASPHALTENE
sub BACTERIAL CONTROL
sub WATER INJECTION
sub OTHER
Chemical Management
Laboritories

All water-bearing systems have the potential for microbial contamination. In general, biocides are applied to oilfield systems to control microbially influenced corrosion (MIC) and alleviate the problems associated with by-products from bacterial respiration e.g. poisonous gases, inorganic and organic acids, slime and scales such as iron sulphide. Bacteria can survive in one of two phases, planktonic phase (suspended) or in biofilms (attached to a surface).

Frequently, oil-producing systems experience severe problems due to the growth and proliferation of bacterial populations. The three most important genera of bacteria in oilfield systems are listed below with an outline of the main problems associated with their growth and proliferation:

Sulphate Reducing Bacteria

  • Microbially Influenced Corrosion (MIC) by cathodic depolarisation of metal surfaces resulting in removal of the atomic hydrogen layer and the formation of localised pitting.
  • Produce hydrogen sulphide as a by product of their metabolism which poses a significant risk to health and safety and can result in the formation of iron sulphide deposits.
  • Due to their metabolic requirement for sulphate, SRB are commonly found in water injection systems (downstream of deaeration), production systems with seawater breakthrough and crude oil / water storage vessels.

 

Acid Producing Bacteria

  • APB are also implicated in the corrosion process as they metabolically secrete organic and inorganic acids which can become trapped under bacterial biofilms and promote corrosion by the removal of the passivating oxide film.

Slime Forming Bacteria

  • Potential to produce large volumes of exopolymer ideal for biofilm formation.
  • Slime production can result in fouling and blocking of filters, lines, injection pores etc.
  • Establishment of oxygen concentration cells that can lead to under deposit corrosion and promote an ideal environment for SRBís.

 

RX-1200 Biocide Series is our range of liquid and solid biocides to aid control of both planktonic and sessile bacterial growth.

 

more info
For further detailed product information and case histories please contact a Roemex sales representative
or e-mail:
Enquiries@roemex.com

 

 

 

 


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