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Charge-reversal surfactant antibiotic material for reducing microbial corrosion in


Abstract

The corrosions caused by sulfate-reducing bacteria (SRB) are serious problems in petroleum exploitation and transportation, which can lead to safety problems, environmental pollutions, and economic losses. Here, a charge-reversal surfactant antibiotic material N-dodecyl-1-carboxylic acid-1-cyclohexenyl-2-carboxamide (C12N-DCA) is designed and synthesized. C12N-DCA is a negatively charged surfactant, which cannot be adsorbed by soil and rock in a large amount. Therefore, it can reach the “lesion location”, with enough concentration. After being hydrolyzed and charge reversed under the acceleration of H2S produced by SRB, C12N-DCA becomes a positively charged surfactant dodecane ammonium salt to kill SRB. Through a simulating experiment, it is found that C12N-DCA can reach the SRB inhibition ratio of almost 100%, and it can reduce iron corrosion by 88%. Such an antibiotic material or its homologs may be added to the chemical flooding fluids, killing SRB during petroleum exploitation and reducing the SRB-induced corrosion in the petroleum exploitation and transportation.

INTRODUCTION

Corrosion is a serious problem in the petroleum industry (13). On the one hand, corrosion causes device damage or pipeline perforation, resulting in short circuit, leakage, or other serious problems of safety and environmental pollution (4, 5). On the other hand, the corrosion of steel also gives rise to great economic losses (2, 3). Among all the corrosions in the petroleum industry, microbial corrosion accounts for a large proportion (6), mainly in the following three aspects. First, the polymer corrosion of chemical flooding fluids in the oil field comes from the decomposition of polymers in chemical flooding fluids by anaerobic microorganisms (7), which leads to the decrease in efficiency of displacement of reservoir oil. Second, corrosion of steel in exploitation and pipeline transportation basically arises from the metabolic processes and metabolites, which results in device damage, pipeline blockage, or perforation (3, 8). Last, corrosion of steel in water stations and recycled water pipelines (9) is same as that in pipeline transportation, which causes frequent maintenance and replacement of devices and pipelines. In general, microbial corrosion is mainly caused by the metabolic process and metabolites of microorganisms (10), while microorganisms in the soil extracted during petroleum exploitation are the source of the above microorganisms.

Of all the microorganisms that cause corrosion, sulfate-reducing bacteria (SRB) are generally considered to be the most harmful ones (1013). This kind of bacteria can reduce sulfate to sulfur ions, being in the form of hydrogen sulfide or ferrous sulfide, thus causing serious corrosion to steel (14, 15). In addition, SRB, as an anaerobic microorganism, may cause decomposition of the components in the chemical flooding fluids and reduce the efficiency of displacement of reservoir oil (16). There are many SRB…



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2020-06-19 18:00:33

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