摘要
为准确预测吉林油田致密气藏不同压力条件下的单井产能,在压力恢复试井解释和Topaze-生产数据动态分析解释基础上,应用试井半对数曲线直线段的斜率公式和气井平面径向流产量公式,取平均值求出有效渗透率,与动态分析解释的地层压力建立回归方程,得出不同压力下对应的有效渗透率剖面。基于对有效渗透率剖面的评价,通过地层压力与有效渗透率回归公式计算有效渗透率,利用变形的地层压力与有效渗透率回归公式预测地层压力。应用该方法,对C气田A井进行致密气藏压力敏感性评价,平均地层压力达到26.80 MPa,有效渗透率平均相对误差仅为8.74%。该方法可有效解决致密气藏试井渗透性评价难题,为致密气勘探开发提供理论依据。
To accurately predict the single well production capacity of tight gas reservoir in Jilin Oilfield with different pressure,based on the pressure buildup well testing interpretation and the dynamic analysis and interpretation of Topaz-production data,the effective permeability is calculated by taking the average value using the slope formula of the straight section of the well testing semi-logarithmic curve and the formula of plane radial flow of gas well.Then the effective permeability profile under different pressure is established according to the regression equation calculated by the formation pressure interpreted by dynamic analysis.Based on the evaluation of the effective permeability profile,the effective permeability is calculated by the regression formula of reservoir pressure and effective permeability under a certain reservoir pressure,and the daily gas production of a single well is predicted by using the deformed slope of the straight section of the semi-logarithmic curve of well testing and the formula of plane radial flow of gas well.After that,the effective permeability is obtained,and the formation pressure can be predicted by the deformed regression formula of reservoir pressure and effective permeability.Using this method to evaluate the pressure sensitivity of tight gas reservoir in Well A of C gas field,the average formation pressure of this reservoir is 26.80 MPa,and the average relative error of effective permeability is only 8.74%.This method can effectively solve the problems of well testing permeability evaluation of tight gas reservoir and provide a theoretical basis for tight gas exploration and development.
作者
张英魁
李忠诚
孙胜宇
孙晓辉
ZHANG Yingkui;LI Zhongcheng;SUN Shengyu;SUN Xiaohui(Exploration and Development Research Institute,PetroChina Jilin Oilfield Company,Songyuan,Jilin 138000,China;Huagang Gas Group Company Limted,PetroChina Huabei oilfield Company,Renqiu,Hebei 062550,China)
出处
《油气井测试》
2022年第3期73-78,共6页
Well Testing
关键词
致密气藏
试井解释
动态分析
地层压力
有效渗透率
产气量
敏感性分析
tight gas reservoir
well testing interpretation
dynamic analysis
reservoir pressure
effective permeability
gas production
sensitivity analysis
