Abstract
The scope of this study includes modeling and experimental investigation of sulfide stress cracking (SSC) of high-strength carbon steel. A model has been developed to predict hydrogen permeation in steel for a given pressure and temperature condition. The model is validated with existing and new laboratory measurements. The experiments were performed using C-110 grade steel specimens. The specimens were aged in 2% (wt.) brine saturated with mixed gas containing CH4, CO2, and H2S. The concentration H2S was maintained constant (280 ppm) while varying the partial pressure ratio of CO2 (i.e., the ratio of partial pressure of CO2 to the total pressure) from 0 to 15%. The changes occurring in the mechanical properties of the specimens were evaluated after exposure to assess material embrittlement and SSC corrosion. Besides this, the cracks developed on the surface of the specimens were examined using an optical microscope. Results show that the hydrogen permeation, and subsequently SSC resistance, of C-110 grade steel were strongly influenced by the Partial Pressure Ratio (PPR) of CO2 when the PPR was between 0 and 5%. The PPR of CO2 had a limited impact on the SSC process when it was between 10 and 15 percent.
Highlights
In a sour environment, Sulfide Stress Cracking (SSC) corrosion often degrades downhole tubulars by embrittlement which leads to premature failure
This study is aimed at understanding the mechanism of hydrogen diffusion in metals in presence of H2 S, determining the factors that influence the vulnerability of tubulars to SSC corrosion, and formulating a model to predict SSC corrosion susceptibility of metals
The following conclusions can be drawn based on experimental and modeling investigations performed in this study: 5. Conclusions
Summary
Sulfide Stress Cracking (SSC) corrosion often degrades downhole tubulars by embrittlement which leads to premature failure. This study is aimed at understanding the mechanism of hydrogen diffusion in metals in presence of H2 S, determining the factors that influence the vulnerability of tubulars to SSC corrosion, and formulating a model to predict SSC corrosion susceptibility of metals. Often SSC corrosion studies [1,2,3,4] are performed at pressures less than 6 bar. The assessment of SSC corrosion is commonly performed applying the standard NACE test Method A with cylindrical specimens. Other methods have been developed in the industry to assess the SSC corrosion resistance of metals [5]. Cernocky et al [6] developed an experimental setup for SSC corrosion testing of a minipipe specimen subjected to triaxial stress loading conditions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
