Data from: Corrosion resistant systems of formate packer fluid for G3/N80/TP110SS pipes at high temperature, high pressure and high H2S/CO2 ratios

A series of corrosion problems caused by high-temperature, high-pressure and high-acid gas environments has been an issue in oil and gas production for a long time. During the development of a high-acid gas field, the petroleum pipe is subjected to many aspects of corrosion, and the corrosion mechanism is complicated by the condition of the coexistence of H2S/CO2/O2. Based on the study of the corrosion problem associated with the formate packer fluid in Southwest China, three kinds of steels were studied for corrosion prevention in the Alloy G3/N80 Steel/TP110SS Steel. The study shows that the corrosion rate of the formate packer fluid is low, but corrosion is severe in environments characterised by high temperatures, high pressures and high acid gas contents. Based on the consideration of cost and the difficulty of realization, an anti-corrosion system was constructed based on the existing packer fluid, mainly through the introduction of a variety of anti-corrosion additives. Through the selection of various additives and corrosion experiments, a corrosion protection system of formate packer fluid was developed. Corrosion tests show that the corrosion rate of the system must be less than 0.076 mm/a to achieve the purpose of corrosion protection. The formate packer fluid with corrosion protection can meet the needs of the current application.高温、高压及高酸性气体环境引发的一系列腐蚀问题，长期以来都是油气开采领域的行业痛点。在高酸性气田开发过程中，石油管材会受到多维度腐蚀作用，且由于硫化氢（H₂S）、二氧化碳（CO₂）与氧气（O₂）共存的工况条件，腐蚀机理变得更为复杂。针对中国西南地区甲酸盐封隔液（formate packer fluid）相关的腐蚀问题开展研究时，选取了G3合金、N80钢、TP110SS钢三种钢材进行防腐性能研究。研究表明，甲酸盐封隔液本身的腐蚀速率较低，但在高温、高压及高酸性气体含量的工况环境中，腐蚀情况仍较为严重。综合考虑成本与实现难度，研究团队以现有封隔液为基础，通过引入多种防腐添加剂构建了防腐体系。通过对各类添加剂的筛选与腐蚀实验，最终开发出适配甲酸盐封隔液的防腐体系。腐蚀测试结果显示，该防腐体系的腐蚀速率需低于0.076毫米/年，方可达成防腐目标。该带防腐功能的甲酸盐封隔液可满足当前现场应用需求。