含硫化氢天然气井井喷事故后果数值模拟

Numerical Simulation of the Blowout Accident in a Sour Gas Well

井喷事故后果严重,特别是当井喷物质中含有H2S等有毒气体时,会造成重大的人员伤亡和财产损失,研究含H2S天然气井喷气体的扩散蔓延规律具有重要的应用价值。本文建立了含H2S天然气井井喷事故模型,对含H2S天然气井喷事故进行了数值模拟计算,模拟得到含H2S天然气井喷事故中,井喷气体的速度及浓度场的分布情况。数值模拟结果表明井喷气体符合气体射流规律,并可以数值模拟结果为依据进行井喷事故发生后危险区域的划分。

The blowout accident of a natural gas well,especially,one involving poison gases such as H2S,could lead to serious consequences including casualty and property loss,and the diffusion of the sour gas from the well blowout is of great importance in the process.In this paper,a blowout accident model of sour gas well is built to simulate the blowing process.The velocity and the concentration distribution of the sour gas in the blowout accident are obtained from the numerical simulation.The velocity distribution of the blowout gas is symmetric when the gas flow is stable in air.The max velocity of the sour gas in the blowout is 875m/s in the simulation space.The safety threshold of the mass fraction of CH4 is 0.0277,and that of H2S is 7.722×10-6.The results of the simulation show that the gas blowing from well follows the law of gas jet.The safety area is the zone 100m away from the outlet of blowout well,and the danger zone is around the well because of the higher density of H2S,furthermore,the dangerous zone could be identified after blowout accident based on the simulation results.