空气驱过程中爆炸极限影响因素及预测模型

Influential factors and model prediction for explosion limits during air flooding

空气驱作为一项富有创造性的提高采收率技术,受到越来越多的重视。而爆炸风险的存在严重制约了该技术的发展和应用,因此准确掌握和控制可燃气体的爆炸极限对空气驱技术的消防预警和安全生产有着重要意义。为此,分析了可燃气体爆炸极限的影响因素,结果表明:混合可燃气体的组分会影响其爆炸极限,多组分可燃气体的爆炸极限为各组分的调和平均值;爆炸极限范围随温度升高而增大,呈线性变化;爆炸极限范围也随压力的增加而增大,但呈对数变化;爆炸极限范围随惰性气体体积分数的增加而减小,不同惰性气体抑爆效果不同。运用数值分析原理,结合经验公式,拟合出了不同影响因素下可燃气体的爆炸极限预测模型和统一预测模型,模型的建立为确定空气驱工艺中不同条件下油气混合物的爆炸极限提供了参考。

Air flooding,as a creative EOR technique,is receiving more and more attention. The existence of explosion risk severely constrains the development and application of this technique. Thus,it is of great importance to obtain a clear knowledge and control of the explosion limits of combustible gases for fire warning and production safety of the air flooding technique. For this reason,the factors that influence the explosion limits of the combustible gases were analyzed,and the results show that:the components of the mix combustible gases can influence on its explosion limits,and the combustible gases with multi-component have an explosion limits which are the harmonic mean of those components;the explosion limits increase linearly with the raise of temperature,but increase logarithmically with the raise of pressure;the explosion limits decrease with the increasing volume fraction of inert gases,and different kinds of inert gases have various influences on explosion proof. The calculation models with different factors and unified prediction model of the explosion limits of the combustible gases were matched by using mechanism of numerical analysis and combination of empirical formula,and that will provide reference for predicting the explosion limits of oil-gas mixture under different conditions in air flooding technique.