Characterization of the generalized permeability jail in tight reservoirs by analyzing relative-permeability curves and numerical simulation

作     者：Feng-Peng Lai Zhi-Ping Li He-Xin Wei Wei Zhang 

作者机构：School of Energy ResourcesChina University of GeosciencesBeijing100083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development EngineeringBeijing100083China Changchun Oil Production Plant of Jilin OilfieldPetroChinaChangchun130062JilinChina Changqing Oilfield CompanyPetroChinaXi'an710018ShaanxiChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第5期

页      面：2939-2950页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：the financial support from the National Natural Science Foundation of China(No.51774255 and 52174037). 

主　　题：Generalized permeability jail Characterization Relative permeability curve Numerical simulation Pore structure 

摘      要：This study comprehensively characterizes the boundary values of generalized permeability jail in tight reservoirs through relative-permeability curve analysis,numerical simulation,and economic evaluation.A total number of 108 relative-permeability curves of rock samples from tight reservoirs were obtained,and the characteristics of relative-permeability curves were analyzed.The irreducible water saturation(Swi)mainly ranges from 20% to 70%,and the residual gas saturation(Sgr)ranges from 5% to 15% for 55% of the samples.The relative-permeability curves are categorized into six types(Category-Ⅰ to Ⅵ)by analyzing the following characteristics:The relative permeability of gas at Swi,the relative permeability of water at Sgr,and the relative permeability corresponding to the isotonic point.The relative permeability curves were normalized to facilitate numerical simulation and evaluate the impact of different types of curves on production performance.The results of simulation show significant difference in production performance for different types of relative-permeability curves:Category-Ⅰ corresponds to the case with best well performance,whereas Categories-Ⅴ and Ⅵ correspond to the cases with least production volume.The results of economic evaluation show a generalized permeability jail for Categories-Ⅳ,Ⅴ,and Ⅵ,and the permeability jail develops when the relative permeability of gas and water is below 0.06.This study further quantifies the range of micro-pore parameters corresponding to the generalized permeability jail for a tight sandstone reservoir.