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根据国外金属材料专家的研究,石油装备(包括油井管柱)在更深、更热和含硫介质更多的井下作业时,常遇到以下3个方面的腐蚀: 失重腐蚀又称全面腐蚀,表现整个金属表面受到不同程度的均匀侵蚀破坏。其原因是溶解于液相的CO_2产生的酸溶液,使碳素钢迅速受到失重腐蚀。此外,井下氯化物和硫化氢也易增加溶液的腐蚀性。局部腐蚀即裂隙腐蚀和点蚀,具体表现为金属损失高度集中于局部位置。通常出现在诸如形成钝化的保护表面膜的不锈钢上,在这里积累氯离子穿入钝
According to foreign experts in metal materials research, petroleum equipment (including oil well pipe string) often encountered the following three aspects of corrosion when more downhole work in deeper, hotter and sulfur-containing media: Corrosion of heavy weight, also known as full corrosion, performance The entire metal surface by varying degrees of uniform erosion damage. The reason for this is that the acid solution produced by CO 2 dissolved in the liquid phase rapidly causes the carbon steel to be subjected to weightless corrosion. In addition, downhole chloride and hydrogen sulfide also tend to increase the corrosiveness of the solution. Local corrosion is crevice corrosion and pitting corrosion, which is manifested in the fact that the metal loss is highly localized in the local area. It usually occurs on stainless steel, such as a passivated protective surface film, where chloride ions accumulate