摘要
在分析天然气高速非达西渗流特征的基础上,考虑了天然气黏度、压缩因子和压缩系数等随压力变化的情况,建立了天然气高度非线性的不稳定渗流数学模型,采用数值差分方法对模型进行了求解,并分析了非达西渗流条件下气体产能特征,以及真实气体PVT参数随压力变化对产能的影响。结果表明,考虑高速非达西流和真实气体PVT参数动态变化时的产能高于达西线性流和PVT参数为常数时的产能,在不稳定渗流的早期、晚期阶段,天然气黏度、压缩系数变化都会对产能产生影响。因此在气藏产能计算和动态分析中应该考虑非达西流和PVT系数变化对产能的影响,以准确指导气藏开发。
Based on the analysis of characteristics of high speed non-Darcy flow, the transient flow e quation of high speed non-Darey flow was created considering the variation of gas viscosity, compression factor and compression coefficient. The flow equation was solved numerically using the finite difference method. The gas production potential under the impact of non-Darcy flow was analyzed. The impact of change of the real gas PVT behavior on the gas production potential was analyzed. The result shows that the gas well production under the non-Darcy flow and the variation of real gas PVT behavior is higher than that of the Darcy flow and the constant of PVT parameters. In the early and later stage, the variation of viscosity and compressibility factor has effect on the productivity of gas respectively. The non-Darey flow and the variation of real gas PVT behavior should be considered in calculating gas well.
出处
《石油钻探技术》
CAS
北大核心
2009年第2期78-81,共4页
Petroleum Drilling Techniques
基金
国家重点基础研究发展计划(“973计划”)项目“注CO2提高原油采收率的多相多组分相态理论”(编号:2006CB705804)资助
