低渗致密气藏垂直裂缝井生产数据分析方法

Methods of Production Data Analysis for Wells with Vertical Fractures in Low-Permeability Tight Gas Reservoirs

为进一步提高低渗致密气藏垂直裂缝井生产数据分析的准确性和可靠性,利用垂直裂缝点汇函数模型,在建立Laplace空间下均匀流量的井壁压力表达式基础上,通过数值反演,绘制Blasingame型生产数据分析典型曲线图版。在分析该图版各渗流阶段的特征后,给出快速、简洁的图版拟合方法。通过生产数据拟合,得到井控储量、渗透率、单井泄流面积和半径,以及裂缝半长等有效参数,能够迅速、有效地评价单井压裂开发效果。

To further improve the accuracy and reliability of production data analysis for wells with vertical fractures in low-permeabilitytight gas reservoirs,the paper uses a point-sink function model for vertical fractures,and establishes an expression of side wall pressurewith uniform flows in Laplace space,based on which typical curve charts of Blasingame-mode production data analysis are mapped throughnumerical inversion.A rapid and simple chart matching method is obtained after the characteristics of each flowing stage on the charts areanalyzed.Through production data matching,effective parameters such as well control reserves,permeability,single well drainage area andradius,and fracture half-length etc.are gained,which can be used to evaluate single-well fracturing effect rapidly and effectively.