摘要
基于定渗透率模式的常规气藏测试数据分析方法,不能准确描述应力敏感地层的产能变化特征,定义了考虑应力敏感的拟压力。应用新的产能方程评价气藏产能的应力敏感性,给出地层压力下降后产能的计算方法。结合应力敏感气井的实际产能测试数据,进行了评价及结果分析。研究表明,产能分析结果与地层应力敏感性大小紧密相关。当应力敏感系数提高0.01时,无阻流量降低约12%,产能方程系数由当前地层压力决定,产能方程高估了地层压力下降后的实际产能。该研究对应力敏感气藏的测试资料解释有一定的指导意义。
Changing of reservoir fluids during production has long been recognized,but the reservoir strata themselves have always been considered to be a static system,the deliverability of many,if not most,reservoirs has been found to vary in some degrees and as a function of stress-sensitive conductivity that changes with changing stress.In order to estimate the productivity of stress-sensitive gas reservoir accurately and incorporate the variable properties in these estimation,a new pseudo-pressure is defined to evaluate the jointed effect of the changes in stress,fluid flow and reservoir properties on well performance,moreover,more attention is paid to the interpretation of deliverability test data and the changes in the production characteristics of the well.Based on this new defined pseudo-pressure,a new deliverability model,which takes variable rock properties in gas reservoir into account and is different from the conventional deliverability model for the coefficients are the functions of pressure and change with the producing time,is proposed.A brief discussion about how to calculate the parameters including the coefficients and new pseudo-pressure utilized in the equation is followed.The results reveal that if the stress-sensitive coefficients increase by 1%,the AOF will decrease 12%.This model is a comprehensive manner and lays a basis for the study of deliverability test analysis in stress-sensitive gas reservoir.
出处
《油气井测试》
2009年第6期18-21,共4页
Well Testing
关键词
应力敏感
产能评价
测试
试井
stress-sensitive,deliverability,data interpretation,well testing
