普光气藏长井段合采产能方程异常特征及消除方法  

Abnormal mechanism of deliverability equation in great thickness and commingled producing wells of Puguang gas field and the eliminating method

作　　者：杨功田[1] 李海涛[2] 付新[3] 

机构地区：[1]西南油气分公司川西采气厂,四川德阳618000 [2]西南油气分公司勘探开发研究院,四川成都610051 [3]西南油气分公司川中油气矿,四川遂宁629000

出　　处：《大庆石油学院学报》2012年第2期77-80,128,共4页Journal of Daqing Petroleum Institute

基　　金：国家科技重大专项(2008ZX05017-001);国家科技支撑计划项目(2008BAB37B04)

摘　　要：针对普光气藏储层普遍具有储层厚度大、层间非均质性强、生产井段长、产量高、生产压差小特点,导致二项式产能分析的直线段斜率对井底流压非常敏感,巨厚气藏的井底流压的取值深度不再能简单地选取地层的中部深度,产能试井解释出现异常(负斜率),综合考虑储层的巨厚、非均质性对井筒压力分布影响,利用数值模拟,分析井底压力计位置对产能方程影响,给出长井段合采产能方程出现异常(负斜率)原因,建立考虑地层系数影响的消除长井段合采产能方程异常的方法,即将压力计放在地层系数为总地层系数1/2的位置.该方法能有效避免二项式产能分析过程中出现负斜率的现象.Puguang gas reservoir is of great thickness,vertically heterogeneity,high productivity and low pressure differential.These factors will cause that the binomial deliverability equation analysis is very sensitive to the bottom hole pressure.So the bottom hole pressure is not measured on the middle depth of the formation,or the slope of binomial deliverability analysis curve will be negative.Considering the effect of heterogeneous and great thickness to the wellbore pressure,the influence of the location of bottom hole pressure gauge on the deliverability equation is analyzed and the reason of abnormal is studied.Then the eliminating method is established considering the effect of formation capacity.It can avoid the negative slope happening effectively.

关 键 词：巨厚气藏 高产 小压差 地层系数 产能评价 普光气藏 负斜率 

分 类 号：TE373[石油与天然气工程—油气田开发工程]