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CO2和H2S共存酸性环境OCTG材料选用研究
闫怡飞1,董卫1,邵兵1,倪元勇2,闫相祯3
(1.中国石油大学机电工程学院,山东青岛 266580;2.中国石油大学油气CAE技术研究中心,山东青岛 266580;3.中石油华北油田分公司, 河北任丘 062550)
摘要:
针对5个公司在CO2 和H2S共存酸性环境下石油管材(OCTG)选材规范及NACE MR0175/ISO 15156标准进行对比分析。对影响管材安全性的因素进行分析,给出各环境条件下不同公司选材规范之间的异同和适用范围。研究综合选材方案及操作步骤,编制OCTG材料综合选材软件。以新疆油田三高气井(高温、高压、高硫化氢环境)为例进行具体分析,给出影响材料抗腐蚀性能的计算公式,并根据材料的不同性质选择不同的选材准则。结果表明:影响酸性环境下OCTG选材的主要因素为H2S分压和CO2分压、温度及Cl-含量;得到了最优的选材推荐区间。
关键词:  CO2和H2S  酸性环境  石油管材  材料选用  腐蚀气体
DOI:10.3969/j.issn.1673-5005.2015.04.022
分类号::TG 172.3
基金项目:国家自然科学基金项目(51274231,8);中石油集团公司重点实验室课题(2014A-4214)
Material selection of OCTG in sour environment with CO2 and H2S coexisting
YAN Yifei1, DONG Wei1, SHAO Bing1, NI Yuanyong2, YAN Xiangzhen3
(1.College of Electromechanical Engineering in China University of Petroleum, Qingdao 266580, China;2.Oil and Gas CAE Technology Research Center, China University of Petroleum, Qingdao 266580, China;3.PetroChina Huabei Oilfield Company, Renqiu 062550, China)
Abstract:
Through analyzing different guidelines of five companies and NACE MR0175/ISO 15156 for material selection of OCTG in sour environment with CO2 and H2S coexisting, the main factors were summarized and the difference among them was analyzed. Research was conducted on material selection and operation steps, and corresponding software was developed. Three-high (high temperature, high pressure and high H2S) gas wells in Xinjiang Oilfield were taken for example in this study, the formula for anti-corrosion performance calculation was given, and the material selection was done according to different guidelines depending on the material properties. The results show that the main factors that influencing the choosing of OCTG material are H2S pressure, CO2 pressure, temperature and Cl- content. The optimum material selection recommending interval is given.
Key words:  CO2 and H2S  sour environment  OCTG  material selection  corrosion gas
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