Through extensive R&D, field trials and joint industry research projects with leading oil & gas operators, we have developed a range of specialised, modular packaged solutions for the treatment and sterilisation of produced water before down-hole reinjection in order to maintain well integrity without the need for chemicals and biocides.
Produced water re-injection (PWRI) is increasingly being used by operators to gain value from returning injection waters and avoid the need for environmental discharge or disposal wells.
With total global volumes of re-injected produced water set to increase to over 340-bn barrels annually by 2020, operators are looking for advanced water treatment solutions that can both increase the quality of re-injected produced water, whilst reducing operation costs and simplifying operations.
Traditionally, large volumes of biocide such as Glutaraldehyde and THPS have been used to chemically dose Produced Water to control bacterial growth before reinjection, however the rising costs of chemicals, handling, and offshore storage concerns plus an appetite by operators to reduce the number of chemicals added to the process has seen operators turn to UV treatment as an alternative solution.
Working with a number of major oil and gas operators, atg UV has developed and field tested a range of modular, produced water treatment packages that utilise specially designed UV disinfection reactors to provide a minimum 99.99% reduction of microorganisms such as SRB’s (Sulphate Reducing Bacteria), Acid Producing Bacteria and Slime Forming Bacteria, that if left untreated, pose a range of negative consequences including:
Souring the well with hydrogen sulphide gas H2S
Microbiological induced corrosion
Plugging of the well
By using UV treatment as a primary solution for reducing bacteria, operators can significantly reduce the required volumes of biocides from the process typically by 90%, only requiring a small residual to protect the pipework from re-contamination upstream of the UV package. In some cases, operators have been able to switch from aggressive biocides such as Glutaraldehyde to less hazardous options such as chlorine.
With the reduction in biocide use and the subsequent reduction in offshore transportation, handling, and storage, UV treatment offers a green, environmentally friendly solution that offers to significantly improve the operational costs of produced water treatment operations.
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