Specifics of pipe metal stress corrosion within the media containing H2S and CO2
This article reveals data on evolution of corrosive processes, namely: the sulfide stress-corrosion cracking (SSCC), pit and general corrosion for the oil-gas-well tubing applied within the H2S-and-CO2-containing media. Authors show that SSCC develops in presence of tension stresses, a corrosive medium containing hydrogen sulfide, and nonmetallic micro inclusions in the structure of a pipe steel. It is ascertained that the SSCC can develop even at low partial pressures of H2S (less than 0,3 kPa). In case of high H2S concentrations and unsuitable protective measures against the carbon dioxide attack there are conditions provoking general and pit corrosion of pipes.