共查询到18条相似文献,搜索用时 203 毫秒
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海上热采井套管热应力强度衰减与高温腐蚀叠加条件下的管材优选研究 总被引:1,自引:0,他引:1
目的探究不同材质套管在高温腐蚀环境下的适用性。方法采用高温高压釜,以渤海某稠油油田岩心、地层水样为腐蚀介质,对不同材质的套管进行模拟评价。结果利用气相色谱技术分析确定了该油田的腐蚀环境:CO2分压最高值为0.2 MPa,H2S分压最高值为0.0023 MPa。用最高的腐蚀气体分压进行了腐蚀模拟实验,测定出不同钢材在此腐蚀环境下的腐蚀速率,并建立了长期腐蚀速率预测模型,得到100H、80-1Cr、110-3Cr的长期腐蚀速率分别为0.24、0.20、0.05 mm/a。综合腐蚀实验结果和稠油热采套管强度衰减规律,对热采套管进行了强度设计,80-1Cr、100H、110-3Cr的安全寿命分别为3.8、6.5、11.2 a。结论高温会引起套管强度衰减,且腐蚀会导致套管径厚比变化,而多轮次注蒸汽会加速腐蚀进程,降低套管的使用寿命。研究结果对腐蚀环境中稠油热采套管的选材具有重大指导意义。 相似文献
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稠油热采蒸汽输送管的氢蚀爆裂及其预防 总被引:2,自引:0,他引:2
对某油田稠油热采蒸汽输送管爆裂事故进行了分析.发现爆裂部位有局部腐蚀,腐蚀部位的基体中有脱碳及沿晶裂纹,且该处基体中有很高的氢含量.造成蒸汽输送管爆裂的原因在于氢蚀 相似文献
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高温、高压、高腐蚀性介质引起的管柱腐蚀问题已成为国内外高温高压气井井筒完整性的巨大威胁和挑战。首先分析了我国塔里木盆地高温高压气井管柱服役工况环境、作业生产工艺、管柱受力情况以及腐蚀现状,重点回顾了国内外高温高压气井增产改造阶段酸化液引起的腐蚀、氯离子/硫化氢/环空保护液引起的应力腐蚀开裂、管柱接头缝隙腐蚀3种主要的失效形式,同时结合文献研究和现场失效案例分析总结了管柱腐蚀机理和规律。最后总结了高温高压气井管柱未来5大研究方向:基于生命全周期选材评价、15Cr和17Cr新管材、特殊管材酸化缓蚀剂、环空保护液应力腐蚀开裂敏感性、全尺寸管柱腐蚀实验方法。 相似文献
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油气田生产开发期套管的损坏原因分析——《油套管标准研究、油套管失效分析及典型案例》(2) 总被引:1,自引:0,他引:1
简介了套管损坏调查情况。分析了不合理高压注水、欠注开发、断层附近井的注水开发油田,盐岩层(含膏岩层)塑性流动及疏松砂岩油层出砂油田、注蒸汽单井吞吐热采稠油油田生产开发期套管损坏的特点、原因及机理,并简要分析了油气田生产开发期套管腐蚀失效情况及机制。 相似文献
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渤海油田井下管柱CO2腐蚀规律与防腐选材现状 总被引:2,自引:2,他引:0
随着渤海油田的快速发展,CO2腐蚀成为阻碍油气田开发的关键因素之一,由 CO2引起的油气井管材腐蚀破坏问题日益严峻,严重影响井下管柱的使用寿命,制约着渤海油田降本增效的发展目标。综述了CO2对井下管柱的腐蚀机理及影响因素,总结了渤海油田中油气产量较高区块的CO2腐蚀情况及防腐选材研究现状,针对性调研了绥中36-1、埕北等10个油田的生产井的CO2分压、温度分布及腐蚀情况,探讨了渤海油田水介质、pH值、CO2分压、温度对CO2腐蚀的影响规律。结果表明CO2分压小于0.023 MPa时,碳钢油管未发现严重腐蚀;当CO2分压超过0.2 MPa时,井下管柱腐蚀破坏率迅速增加, CO2分压为0.3 MPa时,碳钢油管腐蚀比例约为19.15%,这和理论研究一致。在渤海油田油气开发生产过程中,各种因素可能同时出现,并相互作用,加剧管材的 CO2腐蚀。合金元素 Cr能显著提高油套管的抗腐蚀性,低Cr钢具有良好的耐腐蚀性能和经济性,未来低Cr油套管在渤海油田的适应性评价需要开展进一步的研究。 相似文献
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ABSTRACTAir-assisted steam injection is used to enhance hydrocarbon recovery from heavy oil reservoirs. During this process, downhole tubular goods are subject to corrosion in a mixed oxygen-carbon dioxide-steam environment at temperature up to around 200°C causing a low-temperature oxidation phenomenon. Here we investigate the influence of the O2/CO2 ratio on the corrosion of P110 steel, a grade that is commonly used for oil well casings. Our findings show that corrosion is greatly influenced by the O2 pressure but hardly at all by the CO2 pressure. The maximum corrosion rate was in excess of 65?mm per year. However, alkalisation of the injected fluid, which promoted the formation of a protective magnetite scale, was found to greatly reduce corrosion. 相似文献
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R. Viswanathan J. Sarver J. M. Tanzosh 《Journal of Materials Engineering and Performance》2006,15(3):255-274
The corrosion behavior of tubing materials carrying steam at high temperature is of great concern to fossil power plant operators.
This is due to the fact that the oxide films formed on the steam side can lead to major failures and consequently to reduced
plant availability. The wall loss of the pressure boundary caused by oxidation can increase the hoop stresses and cause premature
creep failures; second, the increased insulation of the tubes due to the low thermal conductivity of the oxide film can lead
to increased metal temperature, thereby exacerbating the fireside corrosion as well as creep problems. The third concern is
that thicker oxides may spall more easily when the plant is cooled down. On restart, the spalled material may lodge somewhere
in the system with the potential for causing tube blockages, or it may be swept out with the working fluid and enter the steam
turbine causing erosion damage to the turbine nozzles and blades. Failures of tubing and turbine components by these mechanisms
have been widely reported in the United States. In view of the importance of the steamside oxidation, a major study of the
phenomenon is being carried out as part of a major national program sponsored by the U.S. Department of Energy and the Ohio
Coal Development Office. As a prelude to the experimental work, a literature survey was performed to document the state of
the art. Results of the review are reported here. 相似文献
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《腐蚀工程科学与技术》2013,48(4):143-148
AbstractThe exfoliating corrosion which occurs on the steam side of cupro-nickel feed-water heater tubes is described, together with a laboratory investigation designed to study the effect of operational variables such as condensaiion, temperature, pressure, thermal cycling and oxygen admission on the corrosion of cupro-nickel alloys.Corrosion similar to that occurring on feed-heater tubes could be reproduced only in high-pressure steam containing oxygen. An explanaiion is given of the incidence and mechanism of corrosion and practical remedies are suggested. 相似文献
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随着塔河油田开发生产的进行,腐蚀问题已逐渐凸显并日趋严重,近年来油田井下管柱等部位腐蚀穿孔断裂事故频繁发生,严重影响了油田的正常生产,其中机采井腐蚀尤为严重,约占整个井下腐蚀的64%.机采井井筒腐蚀问题较突出,在所带来的经济损失最大,对油田生产的影响也最直接.开展机采井井筒腐蚀监测与防护,对防止和减缓油井生产系统腐蚀的危害,确保油田的安全、高效运行具有重要意义.本文通过对井筒腐蚀监测技术的研究应用,进而对缓蚀剂防腐技术进行了系统分析评价,确定了适宜塔河油田机采井的缓蚀剂. 相似文献