NUMERICAL ANALYSIS OF THE KINETICS OF PROPAGATION OF HYDROGEN BLISTERS IN THE OIL-AND-GAS EQUIPMENT

摘要

We consider a problem of cracking of metals (formation of blisters) in the oil-and-gas equipment.The causes of initiation of the nuclei of hydrogen blisters are investigated and, on this basis,a mathematical model of their growth is developed with regard for the electrolytic hydrogenation of the metal surface, hydrogen diffusion into the metal, and its accumulation in the internal microdefects. We also present an example of analysis of the kinetics of growth of circular blisters in low-carbon and low-alloy steels under the action of hydrogen penetrating into the metal in the process of corrosion in wet hydrogen-sulfide media.