Numerical simulation of H2S diffusion for sour natural gas well after uncontrolled blowout for 15 minutes.

According to the actual conditions of oil and gas well, physical and geometric model by numerical simulation are established. To analyze H2S concentration distribution after uncontrolled blowout for 15 min, the environmental wind speed and the initial blowout jet speed are mainly considered. The results show that the wind speed above 2 m/s can form a similar elliptical area along the direction of the wind deflection due to the H2S diffusion, and the press extent increases with the wind peed raising; when the initial gas jet velocity is certain, the spread area of H2S increases with the wind speed raising, but the approximate - oval high concentration area is presented increases at first then decreases trend; When the environmental wind peed is certain, the H2S diffusion area will increase with the increasing of initial gas jet speed; In the higher jet speed conditions, H2S diffusion will appear eddy current, then "bounce" phenomenon will also appear after H2S spreading to the distant ground . [ABSTRACT FROM AUTHOR]