摘要
致密低渗储层具有很强的压敏性，水的存在降低了渗透率，使得储层的应力敏感性加强。通过在不同含水饱和度下对岩样进行不同有效压力的渗透率测试实验，回归出了渗透率与有效压力的关系式，结合平面径向渗流理论推导出气井的产能方程，可计算不同应力敏感系数下的无阻产量。实例计算表明：含水饱和度越高，渗透率越低，应力敏感性越强，气井产能越低，考虑了应力敏感性的产能是不考虑应力敏感性产能的30％～83．3％。
Tight reservoirs have obvious pressure sensitivity.Water may decrease reservoir permeability to further strengthen stress sensitivity.In the study,permeability of rock sample was tested in different effective pressure under different water saturation.So,a relationship between permeability and effective pressure was obtained.And then a deliverability equation of gas wells was derived from the relationship integrated with planar radial percolation.Finally,open-flow production with different sensitive coefficients might be calculated.Calculation indicates that higher water saturation will bring about lower permeability,stronger stress sensitivity and lower well deliverability.The proportion of a deliverability taking stress sensitivity into consideration to another deliverability not considering stress sensitivity ranges from 30% to 83.3%.
出处
《天然气勘探与开发》
2009年第1期32-34,共3页
Natural Gas Exploration and Development
关键词
致密低渗储层
有效压力
应力敏感
含水饱和度
气井产能
tight reservoir,effective pressure,stress sensitivity,water saturation,deliverability of gas well
