摘要
海上油田在进行多元热流体热采过程中遇到了严重的管柱腐蚀问题。为解决隔热油管腐蚀问题,文章采用动态挂片法对CO2/O2体系中P110钢的高温腐蚀规律进行了研究,并且评价了一种咪唑啉缓蚀剂的缓蚀效果。结果表明,在40℃～280℃范围内,P110钢的腐蚀速率出现两个极大值,分别在60℃和180℃;高温CO2/O2体系中,少量的氧气(分压0.02MPa)即可极大地加速P110钢的腐蚀;CO2分压超过2MPa后P110腐蚀速率明显加快;所用缓蚀剂在浓度750mg·L-1时可将腐蚀速率降低至0.10772mm·a-1,缓蚀率达94.17%。应用高温缓蚀剂防腐工艺后,注热后起出的隔热油管未出现明显腐蚀,基本满足高温条件下的多元热流体热采防腐要求。
In order to solve the corrosion problem of insulated tubing, the corrosion laws of P110 steel in high temperature CO2/O2 system were studied and the corrosion mitigation effect of imidazoline corrosion inhibitor was evaluated through dynamic coupon test method. The results indicated that temperature, oxygen partial pressure and carbon dioxide partial pressure have effect on corrosion rate. Two peaks of corrosion rate of P110 steel appeared at 60℃ and 180℃ respectively, in the CO2/O2 system, even a little amount of O2 (partial pressure of 0.02MPa) could remarkably speed up corrosion. The corrosion rate drastically increased when carbon dioxide partial pressure exceeded 2MPa. The imidazoline corrosion inhibitor could lower the corrosion rate to 0.10772 mm·a-1 when the concentration was set at 750mg·L-1, and corrosion inhibition rate was high up 94.17%. The performance of the imidazoline corrosion inhibitor has been tested in field and results showed that the insulated tubing wasn't corroded after using the corrosion inhibitor, which indicated that the corrosion inhibitor could meet the corrosion protection requirement of P110 steel in high temperature CO2/O2 system.
出处
《钻采工艺》
CAS
北大核心
2013年第1期85-87,13,共3页
Drilling & Production Technology
基金
国家重大科技专项子课题"多元热流体热采工程技术示范"
编号:2011ZX05057-005-001
关键词
CO2
O2体系
P110钢
高温
腐蚀
防护
CO2/O2 system, P110 steel, high temperature, corrosion, protection
