摘要
Abstract
Objective To choose appropriate and efficient anti-corrosion measures so as to improve economic benefit and ensure safety of oilfield production. Methods In the paper, water quality of Shanbei gasfield was analyzed and the gas field water from gas well replenished with saturated CO2 was taken as corrosive medium. The influences of temperature, salinity, systematic pH, CO2 content and H2 S content in the water, dissolved oxygen content, HCO3- content and Cl- content on the equipment pipeline corro-sion and the corrosion pattern were discussed by static weight-loss method. Results The water from Shanbei gasfield had the salinity reaching about 50 000 mg/L, Cl-and HCO3-contents were relatively high, the water sample was weak acidic, the pH value was a-round 6. 5. The corrosion rate increased with the increasing in contents of CO2 , H2 S, dissolved oxygen, HCO3-and Cl-in the wa-ter medium, the corrosion rate reached the maximum 0. 352 mm/a at 50℃ and the lowest 0. 250 mm/a when the pH value was 7. Conclusion Corrosion of equipment pipelines of Shanbei gasfield is mainly O2 corrsion and CO2 corrsion.关键词
陕北气田/腐蚀/静态失重法/矿化度/温度Key words
Shanbei gasfield/corrosion/static weight-loss method/salinity/temperature分类
矿业与冶金
