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Damage Evaluation of Supercritical CO2 for Hydronibrile Nitrile(HNBR)
Abstract:
CO2 corrosion for rubber materials makes sealing failure of downwell tools and annulus pressure even, which will endanger the safety production of gas injection wells. The high-temperature high-pressure autoclave was used to test supercritical CO2 corrosion for dumbbell-shaped hydronibrile nitrile with pressure 35MPa, temperature 90°C. The change in mechanical properties and corrosion morphology had been analyzed and compared before and after corrosion test in gas and liquid phase environment. Experimental results show that the hardness of hydronibrile nitrile was hardly changed and no dissolution occurred after corrosion. But the tensile strength decreased by 50%. In engineering design, the influence of corrosion on mechanical properties of rubber should be fully considered, and the mechanical properties of rubber in origin state should not be taken as the basis. The research results have provided evidence for the use of rubber materials in CO2 corrosion environment.
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2582-2585
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Online since:
February 2012
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