柔性管内衬高密度聚乙烯的气体渗透行为研究  

Gas permeation behaviors of high-density polyethylene as a liner material of flexible pipes

作　　者：张冬娜 李厚补 戚东涛 丁楠 邵晓东 魏斌 蔡雪华 

机构地区：[1]中国石油集团石油管工程技术研究院 [2]石油管材及装备材料服役行为与结构安全国家重点实验室

出　　处：《天然气工业》2017年第3期104-110,共7页Natural Gas Industry

基　　金：国家自然科学基金项目"油气耦合介质在热塑性塑料中的渗透特性及机理研究"(编号:51304236);陕西省自然科学基金项目"酸性气体在热塑性塑料中的渗透特性及机理研究"(编号:2014JQ6227)

摘　　要：柔性管内衬材料的气体渗透行为对管材的气体输送效率及管材的使用寿命等都具有非常重要的影响,为此,针对目前国内广泛使用的柔性管内衬材料——高密度乙烯(HDPE),使用压差法对其气体渗透行为进行了研究。试验使用的渗透测试气体分别为CO_2及CH_4,测试温度为30~80℃,对不同测试条件下所获得的渗透系数、溶解度系数及扩散系数进行了分析,并使用煤油模拟油气耦合环境,研究了不同环境下HDPE的气体渗透行为。结果表明:(1)不同温度下CO_2和CH_4在HDPE中的气体渗透系数满足阿伦尼乌斯方程,两种气体透过HDPE的表观活化能分别为32.61 kJ/mol及43.84 kJ/mol;(2)随着温度的升高,CO_2的扩散系数变化不明显,溶解度系数逐渐增加;(3)随着温度的升高,CH_4的扩散系数逐渐增加,溶解度系数变化不明显;(4)在模拟油气耦合介质的测试中,煤油起到了溶胀及增塑作用,CH_4在煤油浸泡HDPE中的扩散系数及渗透系数增加。The gas permeation behavior of liner material of flexible pipes is of great significance to its gas transmission efficiency and service life. High-density polyethylene （HDPE） is widely used as the liner material of flexible pipes in China. In this paper, its gas perme- ation behavior was studied by the differential pressure method. CO2 and CH4 were taken as test gas and tests were carried out at 30-80 ℃. The permeability coefficient, solubility coefficient and diffusion coefficient of HDPE in different test conditions were analyzed. Kerosene was used to simulate the coupled oil and gas setting, and the gas permeation behaviors of HDPE in different environments were measured. It is shown that the gas permeability coefficient of CO2 and CH4 through HDPE at different temperatures meet the Arrhenius equation, and the apparent activation energy of CO2 and CH4 through HDPE is 32.61 kJ/mol and 43.84 kJ/mol, respectively; that with the increase of temperature, the diffusion coefficient of CO2 doesn＇t change greatly while its solubility coefficient increases gradually, and the diffusion coefficient of CH4 increases gradually while its solubility coefficient changes little; and that in the tests to simulate coupled oil and gas media, kerosene plays a role in swelling and plasticization, so the permeability coefficient and diffusion coefficient of CH4 through HDPE soaked in kerosene both increase.

关 键 词：柔性管 内衬材料 气体渗透 高密度聚乙烯 油气耦合 溶解度系数 扩散系数 

分 类 号：TE862[石油与天然气工程—油气储运工程] TQ325.12[化学工程—合成树脂塑料工业]