番禺30-1平台生产管线腐蚀规律研究及剩余寿命预测
发布时间：2018-12-20 14:34
【摘要】：番禺30-1气田产出天然气组分中包含H2S和CO2腐蚀性气体,各气井采出水不仅呈酸性,还含有HCO3-和Cl-等腐蚀性离子。在温度和压力的作用下,这些腐蚀性介质很容易腐蚀番禺30-1平台生产管道,一旦平台上有某段管道因腐蚀发生失效事故将会带来不可估量的后果,因此研究番禺30-1平台生产管线的腐蚀机理并提前预测出剩余服役寿命尤为必要。本文以番禺30-1平台4-PW-1002-E5-P、8-PV-2060-E2、12-PV-1010-E5和6-WS-4064-A5四段现场管线及其材质(16Mn钢、20#钢、双相不锈钢F51)为研究对象,通过能谱分析、X衍射、焊接接头焊接工艺评定、抗硫化氢腐蚀性能评估、腐蚀电化学实验等手段研究现场管道的腐蚀机理,然后利用失重法计算以上三种材质在模拟现场环境下的平均腐蚀速率,最后依据API579标准和SY/T6151-2009标准评价四段管线目前的服役适应性,在确定管道当前的剩余强度满足运行要求后,分别采用均匀腐蚀剩余寿命预测模型和检测数据剩余寿命预测模型预测它们的剩余服役寿命,主要取得以下结论： (1)4-PW-1002-E5-P段管道的腐蚀机理是Cl-促进的SRB腐蚀、HC03-腐蚀和应力腐蚀,8-PV-2060-E2和12-PV-1010-E5两段管道的腐蚀机理是Cl-促进的H2S腐蚀、CO2腐蚀、HCO3-腐蚀和应力腐蚀,6-WS-4064-A5段管道的腐蚀机理是Cl-促进的溶解氧腐蚀和应力腐蚀。 (2)现场管道的焊接接头都存在外部或内部缺陷,并且它们的拉伸性能全部不合格。个别焊接接头的冲击韧性和显微硬度也存在问题。 (3)4-PW-1002-E5-P、8-PV-2060-E2、12-PV-1010-E5和6-WS-4061-A5四段管道目前的剩余强度满足继续服役的要求,其中8-PV-2060-E2段管道的剩余寿命为16年,其余三段管道的剩余寿命都满足20年的设计使用年限。 综上所述,Cr、H2S、CO2、HCO3-、SRB是番禺30-1平台生产管线的主要腐蚀因素,此外虽然4-PW-1002-E5-P、8-PV-2060-E2、12-PV-1010-E5和6-WS-4064-A5四段现场管线已经遭受了不同程度的腐蚀,但是目前依然有能力继续工作运行。
[Abstract]:The components of natural gas produced in Panyu 30-1 gas field contain corrosive gases such as H _ 2S and CO2. The produced water of each gas well is not only acidic, but also contains corrosive ions such as HCO3- and Cl-. Under the action of temperature and pressure, these corrosive media can easily corrode the production pipeline of Panyu 30-1 platform. Once a certain section of pipeline on the platform is damaged by corrosion, there will be incalculable consequences. Therefore, it is necessary to study the corrosion mechanism of Panyu 30-1 production pipeline and predict the remaining service life in advance. In this paper, 4-PW-1002-E5-Pen 8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4064-A5 four-stage pipeline and its material (16Mn steel, 20# steel, two-phase stainless steel F51) are studied in Panyu 30-1 platform. By means of energy spectrum analysis, X-ray diffraction, welding process evaluation of welded joints, evaluation of corrosion resistance of hydrogen sulfide and electrochemical corrosion experiments, the corrosion mechanism of pipeline in situ was studied. Then the average corrosion rate of the above three materials is calculated by weightlessness method. Finally, the adaptability of the four-section pipeline is evaluated according to API579 standard and SY/T6151-2009 standard. After determining that the current residual strength of the pipeline meets the operational requirements, the remaining service life of the pipeline is predicted by the uniform corrosion residual life prediction model and the test data residual life prediction model, respectively. The main conclusions are as follows: (1) the corrosion mechanism of 4-PW-1002-E5-P pipeline is SRB corrosion, HC03- corrosion and stress corrosion promoted by Cl-. The corrosion mechanism of 8-PV-2060-E2 and 12-PV-1010-E5 pipeline is H _ 2S corrosion, CO2 corrosion, HCO3- corrosion and stress corrosion promoted by Cl-. The corrosion mechanism of 6-WS-4064-A5 pipeline is dissolved oxygen corrosion and stress corrosion promoted by Cl-. (2) there are external or internal defects in the welded joints of the field pipes, and their tensile properties are all not up to standard. The impact toughness and microhardness of individual welded joints are also problematic. (3) the current residual strength of 4-PW-1002-E5-Pn-8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4061-A5 four-stage pipeline meets the requirement of continuing service, in which the residual life of 8-PV-2060-E2 section pipeline is 16 years, The remaining life of the remaining three sections of the pipeline meets the design life of 20 years. To sum up, Cr,H2S,CO2,HCO3-,SRB is the main corrosion factor in the production pipeline of Panyu 30-1 platform, in addition, although 4-PW-1002-E5-P, The 8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4064-A5 four-stage pipelines have been corroded to varying degrees, but they are still capable of continuing operation.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE988.2
本文编号：2388135
[Abstract]:The components of natural gas produced in Panyu 30-1 gas field contain corrosive gases such as H _ 2S and CO2. The produced water of each gas well is not only acidic, but also contains corrosive ions such as HCO3- and Cl-. Under the action of temperature and pressure, these corrosive media can easily corrode the production pipeline of Panyu 30-1 platform. Once a certain section of pipeline on the platform is damaged by corrosion, there will be incalculable consequences. Therefore, it is necessary to study the corrosion mechanism of Panyu 30-1 production pipeline and predict the remaining service life in advance. In this paper, 4-PW-1002-E5-Pen 8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4064-A5 four-stage pipeline and its material (16Mn steel, 20# steel, two-phase stainless steel F51) are studied in Panyu 30-1 platform. By means of energy spectrum analysis, X-ray diffraction, welding process evaluation of welded joints, evaluation of corrosion resistance of hydrogen sulfide and electrochemical corrosion experiments, the corrosion mechanism of pipeline in situ was studied. Then the average corrosion rate of the above three materials is calculated by weightlessness method. Finally, the adaptability of the four-section pipeline is evaluated according to API579 standard and SY/T6151-2009 standard. After determining that the current residual strength of the pipeline meets the operational requirements, the remaining service life of the pipeline is predicted by the uniform corrosion residual life prediction model and the test data residual life prediction model, respectively. The main conclusions are as follows: (1) the corrosion mechanism of 4-PW-1002-E5-P pipeline is SRB corrosion, HC03- corrosion and stress corrosion promoted by Cl-. The corrosion mechanism of 8-PV-2060-E2 and 12-PV-1010-E5 pipeline is H _ 2S corrosion, CO2 corrosion, HCO3- corrosion and stress corrosion promoted by Cl-. The corrosion mechanism of 6-WS-4064-A5 pipeline is dissolved oxygen corrosion and stress corrosion promoted by Cl-. (2) there are external or internal defects in the welded joints of the field pipes, and their tensile properties are all not up to standard. The impact toughness and microhardness of individual welded joints are also problematic. (3) the current residual strength of 4-PW-1002-E5-Pn-8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4061-A5 four-stage pipeline meets the requirement of continuing service, in which the residual life of 8-PV-2060-E2 section pipeline is 16 years, The remaining life of the remaining three sections of the pipeline meets the design life of 20 years. To sum up, Cr,H2S,CO2,HCO3-,SRB is the main corrosion factor in the production pipeline of Panyu 30-1 platform, in addition, although 4-PW-1002-E5-P, The 8-PV-2060-E2O12-PV-1010-E5 and 6-WS-4064-A5 four-stage pipelines have been corroded to varying degrees, but they are still capable of continuing operation.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE988.2
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