低渗透气藏应力敏感与气井产量分析

低渗透气藏生产井产量及递减规律受生产压差、地层压力变化和储层开发地质条件等多种因素影响。通过试验和分析实际生产动态资料，探讨了应力敏感对储层物性和单井产量的影响，建立了考虑应力作用的数学模型，并获得其无因次产量拉氏空间解，从理论上阐述了应力敏感对气井产量的影响程度。研究表明，低渗透气藏应力敏感对地层渗透能力影响大，进而影响产量及其递减规律。在生产管理中要采取合理的开发技术方案，防止井底地层压力迅速下降导致渗透能力的降低。

Stress sensitivity effect of low-permeability gas reservoirs and production analysis of gas wells

The well productivity and its decline in low permeability gas reservoir will be influenced by many factors including the differential pressure during production, variable formation pressure, geological conditions, and so on. Based on field tests and dynamic data from actual production, this study analyzed on the effect of stress sensitivity on the physical characters of reservoirs and the productivity of a single well, then built up a mathematical model considering the stress sensitivity, and obtained the Laplace 3D Solution at dimensionless rate which helps the theoretical explanation on how the stress sensitivity has effect on the productivity and its decline of reservoirs. This paper puts forward that reasonable technical measures should be taken in well production management to prevent the rapid decrease of bottomhole formation pressure resulting in low permeability.