中文标题 塔河油田井下油套管钢CO2/H2S腐蚀试验研究
英文标题 The CO2/H2S Corrosion tests of tube and casing materials in Tahe oilfied
作者 周鹏
专业与研究方向 油气储运工程 油气管道腐蚀与防护
指导教师 袁宗明
申请学位等级 硕士
机构 西南石油大学
论文完成年度 2008
中图分类号 TE98
中文关键词 CO2/H2S腐蚀；油套管钢；高温高压腐蚀；腐蚀速率预测模型
英文关键词 CO2/H2S Corrosion;tube and casing steel;Corrosion of high temperature and high pressure;Corrosion rate prediction modal
中文摘要 塔河油田在开发过程中，由于CO2、H2S等腐蚀气体的存在，以及产出水中高含Cl-、Ca2+、Mg2+等，再加之井下高温高压多相流环境条件，造成井下油套管严重腐蚀破坏，随着油田的进一步开发，腐蚀问题将会更加突出。
本文以塔河油田为研究背景，通过高温高压腐蚀试验和氢致开裂试验，主要研究了P110、KO110S、KO110SS、13Cr和HP13Cr五种油套管材料在模拟塔河油田CO2/H2S共存环境下的腐蚀行为和腐蚀规律，探讨了主要腐蚀因素的作用机制和影响程度；检测了P110、KO110S、KO110SS钢在H2S饱和溶液中的抗HIC性能；建立了油套管钢CO2/H2S均匀腐蚀速率预测模型；评价筛选出了防腐效果良好的缓蚀剂和内涂层，提出了油套管腐蚀控制措施。本文的研究为塔河油田油套管腐蚀预测、选材和腐蚀控制提供试验和理论依据。
本文首先研究了在模拟塔河油田CO2/H2S共存环境下，P110、KO110S、KO110SS、13Cr和HP13Cr五种油套管钢的腐蚀行为，探讨了腐蚀因素（温度、气体分压、介质浓度等）对油套管腐蚀行为的作用规律和影响程度，并对各因素影响作用大小排序；通过模拟油井沿井筒方向的腐蚀环境，研究P110、KO110S和KO110SS三种材料在不同井深部位的腐蚀规律。
本文采用SEM、XRD分析技术和相关理论，通过分析腐蚀产物膜形貌、结构特征，研究腐蚀产物膜对腐蚀速率的影响规律，揭示其与腐蚀行为之间的关系。
通过油套管钢氢致开裂试验，评价五种油套管材料在H2S饱和溶液中抗HIC性能，分析产生氢致裂纹的原因，为塔河油田油套管选材提供依据。
本文在高温高压腐蚀试验研究的基础上，依据De Waard模型和B.Mishra模型，主要考虑成膜温度、CO2与H2S分压比对腐蚀速率的影响，建立了油套管CO2/H2S均匀腐蚀速率预测模型，并用试验数据进行验证，该模型具有较高精度。
通过对四种常用缓蚀剂和涂镀层进行高温高压评价试验，筛选出防腐效果良好的缓蚀剂和内涂层，提出了塔河油田油套管联合保护措施：采用抗硫管材(KO110S、KO110SS)、抗CO2/H2S缓蚀剂(SW-1、XYH-2型)和环氧酚醛内涂层(TC2000型)联合保护。
英文摘要 In the developing process of Tahe oilfiled, the tube and casing in downhole were seriously corroded, which resulted from the exsitence of corrosive gas as CO2, H2S, etc and the high contents of Cl-, Ca2+,Mg2+ in the water, in addition to the high temperature and high pressure .With the further development of oilfields, the corrosion problem will become more prominent.
Based on the research of the Tahe oilfied and the tests of corrosion under the high temperature and high pressure and the Hydrogen Induced Cracking, these texts mainly researched on the corrosion behavior and the corrosive regulary of the tube and casing materials, such as the P110, KO110S, KO110SS, 13Cr and HP13Cr, under the environment that the CO2/H2S are coexistent; It also discussed the corrosive factors’ mechanisms and its influence degree; Measured the anti-HIC performance of the P110, KO110S, KO110SS steels in H2S saturated solution; Established CO2/H2S corrosion rate prediction model; Evaluated and selected corrosion inhibitor and internal coating; Meanwhile, the text supplyed suitable measures to control corrosion of the tube and casing.
This text firstly researched on the corrosion of P110, KO110S, KO110SS, 13Cr and HP13Cr steels under the environment that the CO2, H2S are coexistent simulating the Tahe oilfield; Secondly discussed the corrosion degree of corrosive factors as temperature, gas’ pressure; lastly it also studyed the corrosion regularity of the P110, KO110S, KO110SS at different depth in downhole.
This paper adopted SEM, XRD technique to prove the relationship between the corrosion product film and action through analysing its shape, structure, and contents.
Through the test of Hydrogen Induced Cracking(HIC), the text evaluated the anti-HIC performance of five kinds of tubes and casings steels in H2S saturated solution; It analysied the reasons of hydrogen cracking to provide useful references for the Tahe oilfied’s purchasing on the tube and casing.
On the basis of the high temperature and high pressure corrosion tests, the paper established CO2/H2S corrosion rate prediction model according to De Waard model and B.Mishra model, and proved with test datas that the model is highly accurate.
Through the test to the corrosion inhibitor and coating with high temperature and high pressure, the paper provided a good comprehensive
measure that using the tube and casing (KO110S,KO110SS), corrosion inhibitor (SW-1,XYH-2) and TC2000 epoxy-phenol coating to effectively prevent the corruption.
