油套管腐蚀分析

本工作能通过对中原油田油套管材质的化学分析、腐蚀产物的ＸＲＤ测定、腐蚀裂口处的ＥＰＭＡ成分和夹杂分析、腐蚀管壁ＳＲＢ检测、腐蚀形貌分析等综合讨论了油、套管腐蚀破裂原因,并通过人试验,研究探讨了缓蚀剂对油、套管的防护作用。研究结果表明,中原油田油、套管腐蚀的主要原因是油田产出高矿化度水的二氧化碳电化学腐蚀,其次还存在一定的ＳＲＢ腐蚀。油、套管腐蚀形态的形成则与流体的冲刷磨蚀作用和油管连接处的缝隙腐蚀     

稠油热采井浅层套管腐蚀机理研究

为了对浅层套管在地层水环境下的腐蚀产物组分进行化验分析并确认其腐蚀机理,开展了N80、P110、110H、130TT 4种材质在Cl^-质量浓度分别为5 000、20 000、40 000 mg·L^-1和温度分别为50、100、165、200、280℃条件下的全因子腐蚀实验。结果表明：随着温度升高腐蚀速率逐渐增加,相同温度下,Cl^-质量浓度从5 000 mg·L^-1增加到40 000 mg·L^-1,腐蚀速率呈下降趋势,在高温时这种趋势更为显著。为了更好地比较Cl^-质量浓度对腐蚀速率的影响,开展了无Cl^-、无氧环境、无HCO₃^-环境下的腐蚀实验,可以看出无Cl^-存在时4种材料的腐蚀速率最小,在无氧环境下腐蚀速率远小于含氧环境的腐蚀速率。XRD组分分析测试显示,不同材质、温度、Cl^-环境下,腐蚀产物组成未发生明显改变,主要为Fe₂O...     

油套管腐蚀分析

本工作通过对中原油田油套管材质的化学分析、腐蚀产物的ＸＲＤ测定、腐蚀裂口处的ＥＰＭＡ成分和夹杂分析、腐蚀管壁ＳＲＢ检测、腐蚀形貌分析等综合讨论了油、套管腐蚀破裂原因,并通过室内试验,研究探讨了缓蚀剂对油、套管的防护作用。研究结果表明,中原油田油、套管腐蚀的主要原因是油田产出高矿化度水的二氧化碳电化学腐蚀,其次还存在一定的ＳＲＢ腐蚀。油、套管腐蚀形态的形成则与流体的冲刷磨蚀作用和油管连接处的缝隙腐蚀作用密切有关。室内缓蚀剂试验表明,采用一定的咪唑啉缓蚀剂可以有效地防止管材二氧化碳腐蚀     

油套管腐蚀与防护技术探讨

油套管是油井的主要构件之一,在油井开发的过程中,其成本约占整个油井开发成本的30%左右,其消耗巨大。在油气开采的过程中,油套管容易遭到腐蚀,这对油气开采工作的开展会产生极大的影响。如何提高油套管的抗腐蚀能力,是油气开采过程中的关键环节。本文对油套管腐蚀的机理和特征进行了一定的分析,并对其防护技术进行了一定的讨论。     

油套管腐蚀与防护技术发展现状

在我国社会经济发展与转型的新时期,要想从根本上提高油气田的开采效率,满足社会发展对油气资源的需求,就要进一步加强油套管的腐蚀防护工作,对现有的油套管腐蚀与防护技术进行创新与完善,以此来延长油套管的使用寿命,增强油套管的抗腐蚀性能,从而促进我国油气行业的可持续发展。因此,本文章主要针对油套管腐蚀与防护技术发展现状进行了深入的分析与研究。     

沙念油田套管腐蚀行为研究

随着开发时间的延长,因腐蚀引起的套损井的数量不断增加,严重影响了沙念油田的正常生产。为摸清沙念油田套管腐蚀规律,为制定套管防腐技术措施提供科学依据,利用新型的井下CO2动态腐蚀模拟试验装置进行了室内不同CO2分压、温度、流速等因素控制下套管腐蚀速率的测定,并在此基础上对套管腐蚀行为进行了研究。试验结果表明:N80套管钢的腐蚀速率随CO2分压、温度和流速的增加而增加,局部腐蚀严重,腐蚀产物以Fe CO3为主。     

注水井套管腐蚀试验

通过恒温水浴锅试验,得出油田注水井套管腐蚀与污水矿化度和温度之间的关系。     

南堡陆地油田二氧化碳腐蚀机理及防治措施

随着CO2吞吐采油技术在南堡陆地油田推广应用,并取得良好增油效果,但也暴露出了腐蚀的问题,制约了二氧化碳吞吐采油技术的发展.文章主要分析了二氧化碳腐蚀机理和影响腐蚀的主控因素,根据目前油井管柱腐蚀情况,提出了二氧化碳腐蚀监测方法及治理措施.     

注水井套管腐蚀的模糊综合评判

油田注水井受到地下因素影响的同时也受到注水的影响,导致了套管腐蚀的加剧,由于影响因素多且复杂,是一个模糊的系统,结合对套管腐蚀研究,应用模糊综合评价法对胜利采油厂套管腐蚀情况进行分析得出影响套管腐蚀的主要因素及权重.     

镁尖晶石浇注料渣蚀行为与机理的研究

镁尖晶石浇注料经坩埚法抗渣后,残存试样可以分为四个段带,即挂渣层、侵蚀层、铁渗透层和硅酸盐相富集层.本实验采用SEM和EDAX研究了各段带的显微结构和基质组成,讨论了转炉终渣对浇注料的侵蚀过程和机理.     

煤焦油加工腐蚀机理及防腐技术探讨

通过对煤焦油加工过程中腐蚀机理的探讨,分析了生产中应重点关注的腐蚀部分,从原料预处理、工艺技术改进和提高设备等级等方面提出了在煤焦油加工过程中有效的防腐方法。     

Concentration monitoring and performance of a migratory corrosion inhibitor in steel-reinforced concrete

Inhibitor concentration depth profiles for concrete samples treated with a proprietary migratory corrosion inhibitor (of the Cortec MCI range) are presented. The treated concrete was cored and these cores were then sectioned and crushed before being immersed in distilled water to extract the available inhibitor. The amine concentrations were quantified using an ammonium-sensing electrode and were then related to the inhibitor concentration present. The inhibitor examined, reported to contain a combination of volatile amines and amino carboxylate compounds, was found to readily diffuse through concrete. The inhibitor was subjected to a 5-year trial and found to be effective in suppressing corrosion of steel reinforcement in the presence of high chloride concentrations. The concentration profiles indicate that only relatively low concentrations of inhibitor were required to achieve inhibition in this case.     

Damage mechanism and corrosion resistance improvement of corundum-mullite kiln furniture during calcining of Li-ion cathode materials

In order to improve the cleanliness of cathode materials of Li ion batteries (LIBs), it is necessary to develop and apply advanced kiln furniture. Low-impurities Corundum-mullite materials (CMM) with were prepared, and the damage mechanism in LNCM production was studied. Innovatively amplify the corrosion process in the form of prefabricated cracks and explore their interaction mechanism. Based on the corrosion mechanism, Si-Al sol was selected as a binder to replace PVA. The corrosion resistance of CMM with Si-Al sol was significantly improved. With the improvement of calcination temperature and purity requirements of LIBs, the research and development of this advanced CMM kiln furniture has a good application prospect in the future.     

二氧化碳激光辐照拉伸纤维形变机理研究进展

介绍了二氧化碳激光辐照拉伸纤维的实验方法 ,纤维的形变特征及纤维的结构与性能 ,与传统热拉伸纤维比较 ,二氧化碳激光拉伸纤维最大形变速率超过 10 4s- 1 ,具有较高强度、模量和韧性。     

冷却水系统中的污垢热阻及金属腐蚀速度的在线监测

研究了冷却水系统中污垢热阻及腐蚀速度的在线监测方法;研制了能模拟冷却水流动和传热状态,并消除自腐蚀电位漂移和溶液IR降影响的冷却水污垢热阻及腐蚀速度在线监测装置;同时开发出相应的软件使整个测量和数据处理过程实现了计算机自动控制。实验结果表明:该装置能真实地在线反映换热器结垢和腐蚀变化情况。     

非渗透钻井液研究及其在川西深井中的应用

随着川西地区油气层开采逐渐向深层发展,钻遇地层越来越复杂,对钻井液的性能要求也日益提高。非渗透钻井液是一种新型钻井液体系,它能有效封堵漏层,提高地层承压能力,扩大钻井液安全密度窗口,减少压差卡钻等。对非渗透钻井液的组成、性能特点及其作用机理作了简要说明,重点介绍了非渗透处理剂WST-100的室内性能评价,及其在封堵漏层、提高地层承压能力、储层保护方面的现场应用,并针对非渗透处理剂WST-100存在的不足,对其今后的改进方向提出了建议。     

西部管道原油成品油双管同沟敷设技术研究

西部管道是我国目前输送距离最长、设计输量最大、设计压力最高、输油工艺先进、自动化水平高、多支线分输和注入的复杂的原油成品油双管同沟敷设管道。本文从西部同沟敷设管道输油工艺、管间距以及原油成品油管间热力影响因素、建设施工工艺和管道沿线的阴极保护防腐技术等多方面,对西部原油成品油同沟敷设管道进行了研究。     

Comparison of corrosion behavior of Ti3SiC2 and Ti3AlC2 in NaCl solutions with Ti

Corrosion behavior of self-sintered, ternary-layered titanium silicon carbide (Ti₃SiC₂) and titanium aluminum carbide (Ti₃AlC₂) fabricated by an in-situ solid-liquid reaction/hot pressing process was investigated by potentiodynamic polarization, potentiostatic polarization and electrochemical impedance spectroscopy in a 3.5% NaCl solution. Commercially pure titanium (Ti) was selected for comparison through XRD, XPS, SEM and EDS examinations for elucidating both the passivation behavior and corrosion mechanism of the alloys. Both Ti₃SiC₂ and Ti₃AlC₂ exhibited significantly superior passivation characteristics compared to Ti; Ti₃SiC₂ also showed better corrosion resistance. The silicon/aluminum site is prone to attack, and the difference in the diffusion rate between the A-site atoms and titanium decreases the passivation ability of the MAX phase. CP titanium exhibited a lower passivation current density and did not undergo breakdown in the test potential region while two MAX phases are destroyed. Nevertheless, the corrosion resistances of Ti₃SiC₂ and Ti₃AlC₂ are comparable to that of CP titanium.     

Iosipescu shear deformation and fracture in model thermoplastic polyolefins

Shear deformation and fracture behaviors in polypropylene (PP)‐based model thermoplastic polyolefins (TPOs) were investigated with the Iosipescu shear test. The shear deformation process was monitored in situ via video camera to obtain experimental shear stress–strain curves of model TPOs. Shear fracture mechanisms were studied with optical microscopy and scanning electron microscopy. Macroscopically, the cracks in neat PP propagated along the maximum shear plane, which indicated that mode‐II shear failure existed in neat PP. Microscopically, it was shown that shear fracture initiated in the form of partial, discontinuous inclined microcracks that later coalesced and formed the final continuous crack. The incorporation of rubber in PP could transform the shear fracture process into a stretching process in the shear damage zone. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3201–3214, 2001