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Research on tubing material selection for preventing corrosion inhigh sour gas well under existence of bacteria corrosion

机译：细菌腐蚀存在下防止高酸气井腐蚀的管材选择研究

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The corrosive attack of material that is caused or promoted by the life activity of bacteria is known as bacteria corrosion. For high sour natural gas wells, formation water may possibly contain sulfate-reducing bacteria (SRB), iron bacteria, sulfur bacteria, and so on, which lurk in formation water and rock. The most common microbiological corrosion in high sour natural gas wells is sulfate-reducing bacteria corrosion.Material selection of tubing for preventing corrosion are very important factors of gas production system life. In order to ensure the long-term development of high sour gas well under existence of bacteria corrosion, this paper mainly study the material selection of tubing for preventing corrosion in high sour gas well under existence of bacteria corrosion. For material selection, traditional method is using sulfur-resistant steels. This paper proposes a new option: using corrosion-resistant alloy. By studying, traditional sulfur-resistant steels in high sour gas wells under existence of bacteria corrosion may have severe corrosion. For high sour gas wells under existence of bacteria corrosionwith high hydrogen sulfide and carbon dioxide content, the new option(selecting corrosion-resistant alloy) is a goodmeasure.By takingCY-T gas field as an example, this paper optimizes the material selection. By corrosion coupon test and galvanic corrosion test, the experiment results showthat there have serious galvanic corrosion and electrochemical corrosion for the traditional sulfur-resistant steel. Despite the high cost, the new option(selecting corrosion-resistant alloy) has long service life, and has no need for adding corrosion inhibitor. For high-productivity and high sour gas wells under existence of bacteria corrosion, the newoption(selecting corrosion-resistant alloy) is an effective and economic corrosion prevention measure. For on-the-spot application, the study above has a good practicality, and can provide reference for the similar high sour gas wells under existence of bacteria corrosion.
机译：由细菌的生命活动引起或促进的材料腐蚀攻击称为细菌腐蚀。对于高酸天然气井，地层水中可能含有硫酸盐还原菌（SRB），铁细菌，硫细菌等，它们潜伏在地层水和岩石中。高酸性天然气井中最常见的微生物腐蚀是硫酸盐还原细菌腐蚀。防止腐蚀的管道材料选择是天然气生产系统寿命的重要因素。为了保证在存在细菌腐蚀的情况下高酸气井的长期发展，本文主要研究在存在细菌腐蚀的情况下防止高酸气井腐蚀的管材选材。在选择材料时，传统方法是使用耐硫钢。本文提出了一种新的选择：使用耐腐蚀合金。通过研究，传统的高硫气井中的耐硫钢在存在细菌腐蚀的情况下可能具有严重的腐蚀。对于存在硫化氢和二氧化碳含量高的细菌腐蚀的高酸气井来说，新的选择（选择耐腐蚀合金）是一个很好的选择。以CY-T气田为例，本文对材料的选择进行了优化。通过腐蚀试件试验和电偶腐蚀试验，实验结果表明，传统耐硫钢存在严重的电偶腐蚀和电化学腐蚀。尽管成本高昂，但新选择（选择耐腐蚀合金）使用寿命长，并且无需添加腐蚀抑制剂。对于存在细菌腐蚀的高产高酸气井而言，新的选择（选择耐腐蚀合金）是一种有效且经济的防腐蚀措施。对于现场应用，以上研究具有很好的实用性，可为存在细菌腐蚀的高酸气井提供参考。

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