深井油管H2S应力腐蚀实验研究

目前含硫化氢的油气井愈来愈多。硫化氢腐蚀严重影响油气田的生产．研究地层条件下硫化氢应力腐蚀规律有重要的意义。为了给油井选材及防腐设计提供理论指导．应用恒载荷实验．模拟油田生产环境下油管柱的应力腐蚀规律，结果表明．即使在对硫化氢应力腐蚀不敏感的温度、酸碱度条件下．仍然会发生硫化物应力开裂现象．断裂面电镜分析表明腐蚀开裂为脆性断裂：模拟环境下．随着深度增加．拉应力减小．硫化氢应力腐蚀发生的概率减小。硫化氢应力腐蚀开裂受多种因素的影响．在含硫化氢油气井完井设计中应根据腐蚀环境．选择合适的管材．配以相应的防硫化氢完井工艺，减少应力腐蚀开裂的发生。图2表3参8

Experiment on H2S stress corrosion of tube in deep well

More and more oil/gas wells contain H2S, and the corrosion has serious effect on oil/gas field production. The study on law of H2 S corrosion under formation conditions is important for reservoir development. Constant load tensile tests were carried out in the laboratory to simulate the tube corrosion rules under production conditions. The results show that stress corrosion crack may occur even under the temperature and pH value not sensitive to H2 S stress corrosion. Scanning electron microscope features of the fractured surface show that the corrosion crack is brittle crack. Stress corrosion crack is affected by many factors. Select appropriate material in well completion according to corrosion environment and provide correspondent completion technique, then the corrosion crack could be reduced, and oil/gas field development requirementsmet.