关键词: 含硫气井, 硫化氢扩散, 释放速率, 危险水平, 硫化氢危险浓度, 分级方法

Abstract: The release rate of hydrogen sulfide(H₂S) at a wellhead was taken as one classification indicator and used to classify H₂S hazard levels of sour gas wells.A heavy-gas dispersion model was used to analyze the relationship between dispersion distance and release rate of H₂S as well as dangerous concentration and release rate of H₂S.A classification method for hazard level of H₂S in the sour gas wells was established.A sour gas well with release rate of H₂S less than 0.9m³ per second is identified as level 4 and has low hazard.A well with release rate of H₂S from 0.9m³ to 3.4m³ per second is identified as level 3 and has medium hazard.When the release rate of H₂S is from 3.4m³ to 6.0m³ per second,the sour gas well is identified as level 2 and has higher hazard.If the release rate of H₂S is over than 6.0m³ per second,the sour gas well is identified as level 1 and has the highest hazard.The feasibility and effectiveness of the classification method were proved by the hazard levels of 941 sour gas wells in China.

Key words: sour gas wells, hydrogen sulfide dispersion, release rate, hazard level, hazard concentration of H₂S, classification method