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CO2及CH4,测试温度为30～80°C,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CO2和CH4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,CO2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,CH4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,CH4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 permeation behavior was studied by the differential pressure method.CO2 and CH4 were taken as test gas and tests were carried out at 30-80 °C.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.
