摘要
煤层气井在开采过程中必定经历气水两相流动阶段,气水两相流动的结果,必然导致煤层气藏压力动态发生变化。因此,研究煤层气井气水两相渗流理论,对于预测煤层气井气水两相流动阶段井底流压的变化及产量动态具有非常重要的作用。基于质量守恒原理,建立了煤层气井气水两相流动阶段地层瞬态渗流的数学模型,通过定义气水两相拟压力函数,同时考虑表皮效应和非达西效应的影响,推导出煤层气井气水两相流动阶段的产能方程,由此绘出煤层气井气水两相流动阶段的瞬态流入动态曲线,为煤层气井的动态分析提供一定的参考。
Coalbed methane well will undergo the gas-water two-phase flow stage during production and two-phase flow will result in the dynamic change of coalbed methane reservoir pressure.Therefore,the study of the gas-water two-phase filtration theory is very important to predict the change of the bottom hole flowing pressure of gas-water two-phase stage and the production performance in coalbed methane well.Based on the mass conservation principle,the mathematical model of transient flow at gas-water two-phase stage in coalbed methane well is established.Through defining the gas-water two-phase pseudo pressure function,at the same time,through taking into account the impact of skin effect and non-Darcy effect,the productivity equation of gas-water two-phase flow is derived,which can obtain the transient inflow performance curve of gas-water two-phase flow in order to provide a reference for dynamic analysis of coalbed methane well.
出处
《断块油气田》
CAS
北大核心
2011年第4期502-504,共3页
Fault-Block Oil & Gas Field
基金
国家科技重大专项"鄂尔多斯盆地石炭二叠系煤层气勘探开发示范工程"子课题"烟煤储层增产改造技术试验与应用"(2008ZX05062-03)
关键词
煤层气井
两相流动
产能方程
曲线
coalbed methane well
two-phase flow
deliverability equation
curve
