油气田开采过程中H_2S腐蚀影响因素研究  

Factors Affecting H_2S Corrosion in the Process of Oil and Gas Exploitation

作　　者：李东霞[1] 王克锋[1] 苏玉亮[2] 

机构地区：[1]中国石油大学(华东)物理科学与技术学院,山东东营257061 [2]中国石油大学(华东)石油工程学院,山东东营257061

出　　处：《石油钻探技术》2010年第1期93-96,共4页Petroleum Drilling Techniques

基　　金："泰山学者"建设工程专项经费资助(编号:Ts20070704)

摘　　要：在石油勘探开发中,钻井、采油、采气、集输工程使用的金属设备都伴随着H2S的腐蚀。建立了H2S腐蚀速率预测模型,分析了油气田开采过程中H2S腐蚀的影响因素。分析结果表明:钢铁在H2S环境中的腐蚀速率受H2S气体的浓度、温度、流速和保护膜等因素的影响;腐蚀速率随着温度的升高而增大,随H2S气体浓度的增加先增大后降低,而随流速的增加先增大后趋于稳定;钢铁表面的结垢厚度是腐蚀速率和沉积速率两个因素共同作用的结果,它随H2S气体浓度的增大而增大,随流速的增大而减小;随着反应时间的增长,钢铁设备表面结垢的厚度增大,最后趋于稳定;由于结垢厚度的增大,其对钢铁设备的保护作用增强,当厚度不再增大时腐蚀速率也基本趋于稳定。In oil exploration and development, metal equipment used in drilling, production and gathering and transportation are accompanied by H2 S corrosion. A prediction model for H2 S corrosion rate is established to study the affecting factors of H2S corrosion in oil and gas exploitation. The results show that the steel＇s corrosion rate in H2S environment is affected by gas concentration, temperature, flow velocity and resist film, etc. The corrosion rate in- creases as the temperature increases. With the increase of H2S concentration, the corrosion rate first increases and then decreases. While with the increase of velocity, the corrosion rate first increases and then stabilizes. The thickness of steel surface scaling is caused by corrosion rate and deposition rate. It increases with the increase of gas concentra- tion and decreases with the increase of flow velocity. With the increase of reaction time, the thickness of the steel sur- face scaling increases and then stabilizes. Due to the increase of scaling thickness, it strengthens the protection of equipment. Corrosion rate is leveling off when the thickness stops increasing. The results provide important reference value for corrosion study in oil and gas exploitation.

关 键 词：油气开采 硫化氢腐蚀 腐蚀速率 结垢:数学模型 

分 类 号：TE958[石油与天然气工程—石油机械设备]