考虑非达西渗流半径的气井不稳定渗流产能模型  

Productivity model of gas well unsteady flow considering non-Darcy flow radius

作　　者：孙岩[1] SUN Yan(Sinopec Petroleum Exploration and Production Research Institute,Beijing 100083,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083

出　　处：《中国科技论文》2020年第4期486-490,共5页China Sciencepaper

基　　金：国家科技重大专项(2016ZX5033—005);中石化科技课题资助项目(2018P18085)。

摘　　要：为研究低渗、储层厚度和孔隙度较大气藏的气井非达西渗流边界影响,基于气井非达西渗流区域的划分,推导了非达西渗流半径和非达西渗流压力损失计算公式,根据气体不稳定渗流基本微分方程,建立了基于非达西渗流边界的气井不稳定渗流产能计算新方法,结合气井实例,进行了产能计算和影响因素分析。研究结果表明:在开采的初期阶段,非达西渗流半径和非达西渗流压力损失迅速下降,对气井产能的影响较大;考虑非达西渗流半径计算的产能高于非达西渗流半径趋于无穷大的产能;随着基质渗透率的减小以及储层厚度和孔隙度的增加,考虑非达西渗流半径与非达西渗流半径趋于无穷大,2种条件预测的日产气量差值越大。To study the influence of non-Darcy seepage radius of gas well for low permeability gas reservoir with large reservoir thickness and porosity,based on the division of non-Darcy seepage region of gas well,the calculation formulas of non-Darcy seepage radius and non-Darcy seepage pressure loss were deduced.According to the basic differential equation of gas unsteady seepage,a new method for calculating unstable seepage productivity in gas well considering the non-Darcy seepage boundary was established.Combined with an example of gas well,the productivity calculation and influence factor analysis were carried out.The results show that the radius of non-Darcy seepage has great influence on gas well productivity in the initial stage of gas well exploitation.The daily gas volume calculated by non-Darcy seepage radius is higher than that the value calculated by the non-Darcy seepage radius tends to infinity.With the decrease of matrix permeability and the increase of reservoir thickness and porosity,the difference of daily gas production predicted under the two conditions of non-Darcy seepage radius and non-Darcy seepage radius tends to infinity is larger.

关 键 词：非达西渗流半径 非达西渗流压力损失 不稳定渗流 产能预测 

分 类 号：TE319[石油与天然气工程—油气田开发工程]