摘要
低渗透气藏中气体的渗流有其独特的特征 ,气体渗流受到启动压差、介质变形和滑脱效应三重因素的影响 ,从而导致气体在储层中的渗流为偏离达西规律的非线性流动。正是由于这种非线性流动的存在 ,使得低渗气藏的开发动态与中高渗透气藏相比有很大的差异。文章基于大量的实验研究 ,系统地分析了启动压差、变形介质和滑脱效应对低渗气藏渗流规律的影响 ,通过实验和机理研究建立了一种新的低渗气藏渗流的基本数学模型。实例计算表明 ,该模型较传统的气田开发数值模拟模型更能准确地反映低渗气藏开发动态 ,更好地指导了气田开发生产。
Gas percolation in gas reservoirs with low permeability has special features. The gas percolation is affected by start-up pressure gradient, media deforming and slippage effect, which makes the percolation non-linear flow deviating from Darcy's law. Just because there exists the non-linear flow, the production performance of gas reservoirs with low permeability differs greatly from those with medium and high permeability. Based on lot of experiments, the influence of start-up pressure gradient, media deforming and slippage effect on the percolation law of gas reservoirs with low permeability is analyzed systematically. With experiment mechanism study, a new mathematical model for gas reservoirs with low permeability is developed. The field application shows that the model can describe the production performance of gas reservoirs with low permeability more accurately and guide the development of gas fields more properly than traditional model of numeral simulation for gas production.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2004年第8期65-68,共4页
Natural Gas Industry
