摘要
根据国内某高含硫气田集输管线内高含H2 S(8%～ 16 % )、CO2 (5 %～ 10 % )的高压腐蚀环境 ,分析了可能存在的腐蚀影响因素 ,并采用静态高温高压釜研究了H2 S、CO2 、温度、Cl-以及元素硫等不同腐蚀影响因素对2 0 # 钢的作用规律。结果表明 ,在试验研究的范围内 ,2 0 # 钢的腐蚀比较严重 ,腐蚀速率在 0 .348～ 2 .5 5 9mm/a之间 ,但温度、水中Cl-含量以及元素硫是影响 2 0 # 钢腐蚀程度的主要因素 :水中Cl-含量越高 ,2 0 # 钢的腐蚀速率越大 ;温度为 4 0℃时 2 0 # 钢的腐蚀速率相对较大 ;元素硫的存在会加速 2 0 # 钢的失重腐蚀和点蚀 ,最大点蚀深度为4 .86 7mm/a。通过室内研究 ,建议现场采取适当的措施清除集输管线内沉积的元素硫 ,而且最好不要让集输管线的温度停留在 4 0℃左右 ,以减轻对管线的腐蚀 ;此外 。
Given the high pressure and corrosion environment with 8%—16% of H2S content and 5%—10% of CO 2 content in the gathering line for a domestic gas field with high sulfur content, the possible corrosion factors are analyzed. And with static high temperature autoclave, the acting law of different corrosion factors, such as H 2S, CO 2, temperature, Cl, and elemental sulfur, etc., on the steel 20 # is investigated. The results show the steel 20 # is corroded severely in the experimental scope. The corrosion rate is at 0.348—2.559 mm/a. But the temperature, Cl content in water and elemental sulfur are the main factors of the steel 20 # corrosion. The higher the Cl content is, the faster the corrosion rate is. The corrosion rate of the steel 20 # is bigger relatively at 40 ℃ of temperature. The weight-loss corrosion and pitting corrosion will be speeded since the elemental sulfur existing. The maximum pitting corrosion depth is 4.867 mm/a. Based on the in-house study, it is suggested the proper measures should be taken to remove the elemental sulfur deposited in the gathering line and keep out of temperature about 40 ℃ for the pipeline operation to reduce the corrosion. Also, the corrosion control should be enhanced for the gathering line where the formation water with high Cl content converges.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第12期122-123,126,共3页
Natural Gas Industry
关键词
集输管线
腐蚀速率
元素硫
含硫
室内研究
腐蚀程度
气田
CO2
高温高压
材质
High pressure, Gathering line, H 2S, corrosion, CO 2 corrosion, Temperature, Water corrosion, Elemental sulfur, Corrosion rate, Influence
