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Quantitative risk evaluation of sour gas development under complicated topographic conditions

Weng Banghua,Zhang Linxia,Xu Xunli,Liu Kun,Zhou Dong,Li Yu(HSE and Technical Supervision Research Institute of Southwest Oil & Gasfield Company,PetroChina,Chengdu,Sichuan 610213,China)  
The main risk in the development of sour gas comes from the intoxication caused by the H2S leakage or diffusion in times of well blowouts or failures of ground facilities.In view of this,computational fluid dynamics(CFD) is first introduced into the simulation of sour gas leakage and diffusion;a digital elevation model and a mesh generation method are adopted to simulate the space-time distribution of H2S under accidents;a quantitative risk evaluation method is developed especially for the sour gas development under complicated topographic conditions.In a case study,the personal risk and social risk values were calculated by use of The Sulfur Gas Leak,Dispersion and Poisoning Quantitative Risk Assessment Software Package(QRA-AYY).In conclusion,compared with the commonly used Lagrangian puff dispersion model,risk contour lines calculated by this quantitative risk evaluation method based on the numerical simulation can better reflect the risk level and distribution under complicated topographic conditions.
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