井喷H2S扩散环境风险数值模拟与风洞实验验证

The CFD and Wind Tunnel Experiment on Hydrogen Sulfide Diffusion of Well Blowout Environmental Risk

关键词:  井喷  H2S  CFD  ANSYS  SST模型  风洞实验

Key words:  well blowout  hydrogen sulfide  CFD  ANSYS  SST mode  wind tunnel test

摘要:

川渝地区高含硫气田的开发具有相当大的环境风险和安全风险。本文以位于四川盆地的某气井为例,考虑到环境风险,模拟了地表浓度在10 mg/m3～30 mg/m3的H2S扩散情况,并将风洞实验结果与CFD模拟结果进行了比较。风洞试验结果显示地表浓度在10 mg/m3～30 mg/m3的扩散区域从井口延伸到2 km远,这与CFD模拟结果10 mg/m3硫化氢扩散距离最远达到计算流场2 km范围基本一致。考虑到安全风险,应用CFD模拟H2S扩散地表浓度为150 mg/m3的扩散情况。通过与风洞实验结果的比较表明,CFD能比较准确地模拟发生井喷后H2S扩散过程中浓度的变化,因此可以应用于实际的风险分析和安全评价中。

Abstract:

There are considerable environmental risks and safety risks in the development of high sulfur gas field in Sichuan-Chongqing area. Based on a gas well in Sichuanbasin as an example,considering environmental risk,thediffusion of hydrogen sulphide whose surface concentration is between 10mg/m3～ 30mg/m3 was simulated. Wind tunnel test results show that the diffusion area of hydrogen sulphidewhose surface concentration is between 10mg/m3 ～ 30mg/m3 extends 2km away from the wellhead,and are basically the same as the CFD simulation results with hydrogen sulphide concentration of 10mg/m3. Considering the safety risk,the CFD diffusion simulation of H2S with 100ppm diffusion surface concentration should be used. Through the comparison with wind tunnel experiments,the results show that CFD simulation can more accurately simulate the H2S diffusion concentration change process happened after a blowout,so it can be used in the actual risk analysis and safety evaluation.