管线钢硫化氢腐蚀影响因素分析及防护措施研究

Analysis of Factors Influencing Hydrogen Sulfide Corrosion in Pipeline Steel and Research on Protective Measures

为了明确硫化氢对油气集输用管线钢的腐蚀规律,并针对性地提出腐蚀防护措施,采用高温高压动态腐蚀实验装置评价了管线钢材在硫化氢存在时的腐蚀情况,考察了包括硫化氢分压在内的不同因素对腐蚀速率的影响,并提出了针对性的腐蚀防护措施。结果表明:随着硫化氢分压和实验温度的增高,挂片的腐蚀速率先增大后减小;腐蚀介质pH越大,腐蚀速率越小;实验流速和含水率越大,腐蚀速率就越大;硫化氢的存在对目标油田集输用X65管线钢的腐蚀影响较大,当硫化氢分压为0.1 MPa时,腐蚀速率达到最大。在相同的实验条件下,缓蚀剂MHS-5对管线钢的腐蚀防护效果最好,缓蚀剂MHS-5的加入能够大大降低挂片的腐蚀速率,当其质量分数为0.05%时,缓蚀效率可以达到92.8%,挂片腐蚀速率小于0.1 mm·a^(-1),能够满足行业标准的要求。

In order to clarify the corrosion law of hydrogen sulfide on pipeline steel for oil and gas gathering and transportation,and propose targeted corrosion protection measures,a high-temperature and high-pressure dynamic corrosion experimental device was used to evaluate the corrosion of pipeline steel in the presence of hydrogen sulfide.The influence of different factors,including hydrogen sulfide partial pressure,on the corrosion rate was investigated,and targeted corrosion protection measures were proposed.The experimental results showed that the increasing of the partial pressure of hydrogen sulfide and the experimental temperature,the corrosion rate of the hanging plate first increased and then decreased;The higher the pH of the corrosive medium,the lower the corrosion rate;The higher the experimental flow rate and moisture content,the greater the corrosion rate;The presence of hydrogen sulfide had a significant impact on the corrosion of X65 pipeline steel for target oilfield gathering and transportation.When the hydrogen sulfide partial pressure was 0.1 MPa,the corrosion rate reached its maximum.Under the same experimental conditions,the corrosion inhibitor MHS-5 had the best corrosion protection effect on pipeline steel.The addition of MHS-5 could greatly reduce the corrosion rate of hanging pieces.When its mass fraction was 0.05%,the corrosion inhibition efficiency could reach 92.8%,and the hanging piece corrosion rate was less than 0.1mm·a^(-1),meeting the requirements of industry standards.