Study on Aging Resistance and Mechanism of Tetrapropyl Fluoride Rubber,Hydrogenated Nitrile Butadiene Rubber,Polyether Ether Ketone Plastics and Polytetrafluoroethylene Plastics
Rubber and thermoplastics are the two most widely used sealing materials in petroleum exploration and development.At present,oil exploitation is in the stage of ultra-high water cut oil production.Well fluid has the characteristics of high water cut,high salinity,strong corrosion,etc.Besides,the mining temperature is high,and corrosive gases such as H2S are diverse,which easily lead to corrosion aging and wear of downhole tools.Therefore,in this experiment,the high-temperature and high-pressure reactor was used to simulate the field conditions,and the high-temperature and high-pressure corrosion experiments were carried out on tetrapropyl fluoro rubber,hydrogenated nitrile rubber,polyetherketone plastic and polytetrafluoroethylene plastic under pressure and free state respectively.The tensile,hardness and compressive permanent deformation of the four samples were taken as the investigation indexes,and the mechanical property damage laws of the samples before and after corrosion were analyzed.The aging mechanism was investigated by means of scanning electron microscopy and infrared spectroscopy,and the suitable sealing materials were selected according to the experimental results.
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