Estimation of bactericidal efficiency of the «UNIKO-N» reagent regarding sulphate reducing bacteria in oil field waters

Abstract

The article presents the results of a study of the effectiveness of the new generation UNIKO-N-60 reagent and its modifications which do not contain salts of quaternary ammonium compounds (QAC), for inactivation of sulfate-reducing bacteria (SRB) in the pumped liquid at the ASHIT Oil and Gas Production Department-1 of JSC «Belkamneft» named by A.A. Volkov.
Comparative data have been obtained on the assessment of the effectiveness when changing the dosage of the reagent on SRB cultures of two field facilities of the UKPN ASH IT and RVS-13 UKPN ASHIT.
The obtained data indicate that the samples of the UNIKO-N exhibit high efficiency. The suppression of the growth of SRB by the samples of UNIKO-N occurs at a low dosage of 5 g/m3. The effectiveness of the reagent was not changed when the dosage was increased to 100 g/m3. Their higher efficiency is shown in comparison with the base reagent.
It is noted that reagents of the UNIKO-N series based on high molecular weight polymer compounds have biocidal activity against all types of bacteria, including SRB, viruses and fungi, while simultaneously exhibiting the properties of corrosion inhibitors. It has been established that UNIKO-N polymer compositions protect St 3 steel from general corrosion in mineralized water in the absence of hydrogen sulfide at a minimum dosage of 0,4 to 4,0 mg/l. Modifications of the UNIKO-N reagent have been developed and tested, having different freezing points, concentrations of active components and various functional additives, depending on the needs of a particular consumer.
The usage of reagents of new generation for inactivation of SRB in petroleum production engineering not containing in its composition QAC permits to eliminate their negative influence on state of equipment and pipelines.