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HYDROGEN PERMEATION AND CORROSION FATIGUE BEHAVIOR OF CARBON STEEL IN DRILLING FLUIDS |
FU Chaoyang ZHENG Jiashen (Huazhong University of Science and Technology; Wuhan 430074) |
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Abstract The corrosion fatigue behavior of carbon steel in drilling fluids was investigated with a self-made rotary type bending corrosion fatigue testing apparatus under simulated drilling conditions. The hydrogen permeation into carbon steel in drilling fluids was studied by electrochemical method.Experimental results showed that sulfide addition into drilling fluid accelerated the corrosion fatigue failure of the steel by promoting hydrogen permeation. The imidazoline inhibitor (DPI-2) suppressed the generation of hydrogen atoms and hydrogen embrittlement and thus prolonged the corrosion fatigue life of carbon steel. Cathodic protection in a specific range of potential (-300~-700mV) could increase the corrosion fatigue resistance of carbon steel in drilling fluid, but excessive cathodic polarization would promote crack propagation and therefore would be harmful.
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Received: 25 August 1997
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