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 t...长期以来，高温、高压、高酸性气体环境引发的系列腐蚀问题，始终是油气生产领域的共性难题。在高酸性气田开发过程中，石油管材会遭受多方面腐蚀，且由于硫化氢（H₂S）、二氧化碳（CO₂）与氧气（O₂）共存的工况，腐蚀机理更为复杂。基于中国西南地区甲酸盐封隔液（formate packer fluid）相关腐蚀问题的研究，本研究选取G3合金（Alloy G3）、N80钢（N80 Steel）与TP110SS钢（TP110SS Steel）三种钢材开展防腐性能研究。研究结果表明，甲酸盐封隔液的腐蚀速率较低，但在高温、高压、高酸性气体含量的环境中，腐蚀情况依然较为严重。综合考量成本与实施难度，本研究基于现有封隔液构建了一套防腐体系，主要通过添加多种防腐添加剂（anti-corrosion additives）。通过t……