摘要
含硫气田水罐内闪蒸气主要组成为可燃气体,因其特殊作业过程,罐内气相空间存在形成混合爆炸气体的可能。结合生产过程的分析和混合气体爆炸极限的相关理论,建立了适合罐内混合气体爆炸浓度的变化模型和计算方法,通过具体实例的计算预测,展示了含硫气田水罐爆炸可能性及控制方式。研究结果表明:当前含硫气田水罐转水过程中存在爆炸形成的可能条件,爆炸极限可根据含惰性气体的混合可燃气进行计算;应明确在液位下降过程中可燃气体浓度是否会在爆炸极限范围内,建议维持含硫气田水罐转水时的微正压,并在呼吸管上设置阻火器,做好防静电接地,优先采用非金属管道和设备等方式降低爆炸风险。
The flash gas from produced water tank of sour gas field consists of mainly flammable gas components.Due to certain specific operating procedure,explosive gas mixture can form in the vapour space of the tank.Combining the theory on explosion limits of the gas concentration and an analysis of production operations,a simulation model and calculation method can be developed to predict changes in concentration of the flammable gas in the vapour space.This model is calibrated against calculated flammable gas concentration of an actual situation and can be used to demonstrate how vapour space explosion in a produced water tank can be predicted and mitigated.The research result shows that vapour space explosion is possible when performing sour produced water tank transfer operations.Explosion limit of the gas mixture can be calculated based on the content of inert gas in the gas mixture,and should show clearly if gas explosion limit can be reached when water level drops during sour produced water transfer.It is suggested to maintain a slight over-atmospheric pressure in the tank during tank transfer,and provide flame arrestor in the breather pipe.Other mitigation measures include provision of anti-static grounding,and the preferential use of non-metallic pipes and equipment etc.to lower explosion risk.
作者
高晓根
邓翔
周潮光
张镨
Gao Xiaogen;Deng Xiang;Zhou Chaoguang;Zhang Pu(Research Institute of Natural Gas Technology,PetroChina Southwest Oil&Gas Field Company,Chengdu,Sichuan,610213,China;Middle Sichuan Gas Fields,PetroChina Southwest Oil&Gas Field Company,Suining,Sichuan,629000,China;Sichuan Changning Natural Gas Development Co.,Ltd.,Chengdu,Sichuan,610056,China)
出处
《天然气与石油》
2020年第3期112-117,共6页
Natural Gas and Oil
基金
国家重大科技专项“四川盆地大型碳酸盐岩气田开发示范工程”(2016 ZX 05052)。
关键词
含硫气田水
闪蒸气
爆炸
模型
计算方法
Sour produced water
Flash Gas
Explosion
Model
Calculation Methods
