热塑性塑料管材在油气田腐蚀介质中性能退化规律研究
发布时间:2018-07-20 17:22
【摘要】:近年来出现的各种热塑性塑料管材不断应用于油气田集输环境。从高分子的角度来研究其合成性能和降解退化性能的研究是很多的。但热塑性塑料管材在油气田输运方面的特殊性以及其作为管道运输方面的专业性的研究较少。本课题以热塑性塑料管材爆破测试和高温高压釜浸泡试验研究热塑性塑料管材在油气田腐蚀介质中退化规律。爆破测试应用常温及高温水压爆破测试装置,对热塑性塑料管材进行了不同温度下的水压爆破测试,测试数据分析处理后,绘制出了相应的曲线,对比分析曲线得出热塑性塑料管材在一定温度,压力下的性能退化。高温高压釜浸泡试验通过模拟油气田环境对热塑性塑料管材特别是内衬层的退化失效规律进行研究。试验表明温度、压力、时间和输送介质对热塑性塑料在油气田使用过程中的性能变化有着重要的影响。与原始试样相比,不同温度浸泡不同时间后的样品随着试验样品与输送介质的各种化学与物理的作用,输送介质与热塑性塑料发生渗入,溶胀和腐蚀效应,使得热塑性塑料出现开裂、变形、起泡等现象。通过对试验前后的样品进行环向拉伸测试,体积变化测试,DSC测试研究了PE80、PE100、聚四氟乙烯(PTFE)、超高分子量聚乙烯(UHMWPE)、到聚四氟乙烯(PTFE)等热塑性塑料在油气田腐蚀介质中的退化规律。热塑性塑料原始样和与油田介质作用后的试验样的环向拉伸强度从PE80、PE100、聚四氟乙烯(PTFE)、超高分子量聚乙烯(UHMWPE)、到聚四氟乙烯(PTFE)依次增加。并且这五种热塑性塑料试样与油田介质作用后的拉伸强度值都明显减小,力学性能下降。比较五种材料在浸泡前后的重量变化,溶胀率,强度损失率和结晶率,可见PE80在原油和H2S环境中的耐腐蚀性能较差。UHMWPE和PTFE表现了较强的原油和H2S环境适应性。它们的材料强度保留率在80%左右,溶胀率符合标准要求,浸泡前后结晶变化较其他三者为低,材料的退化性能缓慢。
[Abstract]:In recent years, various thermoplastic pipes have been used in gathering and transporting environment of oil and gas fields. There are many studies on the synthetic properties and degradation properties of polymers from the point of view of polymers. However, the particularity of thermoplastic pipe in oil and gas field transportation and its specialty as pipeline transportation are few. The degradation of thermoplastic pipe in oil and gas field was studied by blasting test and immersion test in high temperature and high pressure kettle. The water pressure blasting test of thermoplastic pipe was carried out at different temperatures by using the water pressure blasting test device at room temperature and high temperature. After analyzing and processing the test data, the corresponding curve was drawn. The properties of thermoplastic pipes at a certain temperature and pressure were obtained by comparing and analyzing the curves. The degradation failure law of thermoplastic pipe, especially inner liner, was studied by simulating the environment of oil and gas field in high temperature and high pressure kettle immersion test. The results show that temperature, pressure, time and transport medium have important effects on the performance of thermoplastic in oil and gas fields. Compared with the original sample, the samples soaked at different temperatures for different time had the effect of infiltration, swelling and corrosion of the conveying medium and thermoplastic with the chemical and physical effects of the test sample and the conveying medium. Causes the thermoplastic to appear the crack, the deformation, the foaming and so on phenomenon. The degradation of PE80 PE100, PTFE, UHMWPE, PTFE and PTFE in the corrosion medium of oil and gas fields was studied by means of circumferential tensile test, volume change test and DSC test. The circumferential tensile strength of the original thermoplastic sample and the experimental sample treated with oilfield medium increased successively from PE80 PE100, PTFE, UHMWPE to PTFE. The tensile strength and mechanical properties of the five kinds of thermoplastic samples are obviously decreased after the action of the five thermoplastic samples with the oil field medium. Comparing the weight change, swelling rate, strength loss rate and crystallization rate of five kinds of materials before and after soaking, it can be seen that the corrosion resistance of PE80 in crude oil and H _ 2S environment is poor. UHMWPE and PTFE have strong adaptability to crude oil and H _ 2S environment. The strength retention rate of the materials is about 80%, the swelling rate meets the standard requirements, the crystallization changes before and after soaking are lower than those of the other three, and the degradation properties of the materials are slow.
【学位授予单位】:西安石油大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TQ320.724;TE983
本文编号:2134221
[Abstract]:In recent years, various thermoplastic pipes have been used in gathering and transporting environment of oil and gas fields. There are many studies on the synthetic properties and degradation properties of polymers from the point of view of polymers. However, the particularity of thermoplastic pipe in oil and gas field transportation and its specialty as pipeline transportation are few. The degradation of thermoplastic pipe in oil and gas field was studied by blasting test and immersion test in high temperature and high pressure kettle. The water pressure blasting test of thermoplastic pipe was carried out at different temperatures by using the water pressure blasting test device at room temperature and high temperature. After analyzing and processing the test data, the corresponding curve was drawn. The properties of thermoplastic pipes at a certain temperature and pressure were obtained by comparing and analyzing the curves. The degradation failure law of thermoplastic pipe, especially inner liner, was studied by simulating the environment of oil and gas field in high temperature and high pressure kettle immersion test. The results show that temperature, pressure, time and transport medium have important effects on the performance of thermoplastic in oil and gas fields. Compared with the original sample, the samples soaked at different temperatures for different time had the effect of infiltration, swelling and corrosion of the conveying medium and thermoplastic with the chemical and physical effects of the test sample and the conveying medium. Causes the thermoplastic to appear the crack, the deformation, the foaming and so on phenomenon. The degradation of PE80 PE100, PTFE, UHMWPE, PTFE and PTFE in the corrosion medium of oil and gas fields was studied by means of circumferential tensile test, volume change test and DSC test. The circumferential tensile strength of the original thermoplastic sample and the experimental sample treated with oilfield medium increased successively from PE80 PE100, PTFE, UHMWPE to PTFE. The tensile strength and mechanical properties of the five kinds of thermoplastic samples are obviously decreased after the action of the five thermoplastic samples with the oil field medium. Comparing the weight change, swelling rate, strength loss rate and crystallization rate of five kinds of materials before and after soaking, it can be seen that the corrosion resistance of PE80 in crude oil and H _ 2S environment is poor. UHMWPE and PTFE have strong adaptability to crude oil and H _ 2S environment. The strength retention rate of the materials is about 80%, the swelling rate meets the standard requirements, the crystallization changes before and after soaking are lower than those of the other three, and the degradation properties of the materials are slow.
【学位授予单位】:西安石油大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TQ320.724;TE983
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