A reservoir drying method for enhancing recovery of tight gas

作     者：ZHANG Liehui XIONG Yu ZHAO Yulong TANG Hongming GUO Jingjing JIA Chunsheng LEI Qiang WANG Binghe ZHANG Liehui;XIONG Yu;ZHAO Yulong;TANG Hongming;GUO Jingjing;JIA Chunsheng;LEI Qiang;WANG Binghe

作者机构：State Key Laboratory of Oil&Gas Reservoir Geology and ExploitationSouthwest Petroleum UniversityChengdu 610500China Institute of Exploration&ExploitationPetroChina Yumen Oil CompanyYumen 735019China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2022年第49卷第1期

页      面：144-155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：Supported by the National Natural Science Foundation of China (51534006) 

主　　题：tight gas reservoir drying enhancing gas recovery water-blocking removal drying agent seepage ability 

摘      要：Based on the study of damage mechanisms of generalized water blocking and related water-blocking removal methods, the drying agents for enhancing tight gas reservoir recovery were developed, and the basic properties, injection mode and drying effect of the drying agents were evaluated. The chemical effect, thermal effect, salt resistance, salt resistance formulas and delay mechanism of the drying agent systems for different types of tight reservoirs were investigated through lab experiment. The solubility and solubilization properties of supercritical carbon dioxide on drying agent systems were *** injection mode of dissolving drying agent in supercritical carbon dioxide was proposed. The mechanisms of supercritical carbon dioxide with water in micropores of formation matrix were analyzed. Micro-pore structures and seepage characteristics of reservoir before and after drying were compared. Based on the characterization in combination of NMR and laser etched pore structure model, drying effects of the drying agents on bound water of different occurrences were evaluated qualitatively and quantitatively. Lattice Boltzmann method was used to evaluate the influence of drying effect on gas micro-seepage *** influence of drying effect on productivity and production performance of gas well was analyzed by numerical *** drying effect can greatly reduce water saturation of tight reservoir and improve the gas seepage capacity in near wellbore and fractures. This work can provide guidance for developing new measures in enhancing recovery of tight gas reservoirs.