Study of the Seepage Mechanism in Thick Heterogeneous Gas Reservoirs

作     者：Xin Huang Yunpeng Jiang Daowu Huang Xianke He Xianguo Zhang Ping Guo 

作者机构：Shanghai Branch of CNOOCLtd.Shanghai200335China School of GeosciencesChina University of PetroleumQingdao266580China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China 

出 版 物：《Fluid Dynamics & Materials Processing》 (流体力学与材料加工（英文）)

年 卷 期：2023年第19卷第6期

页      面：1679-1691页

核心收录：

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：carried out at the National Natural Science Foundation of China(Nos.41672129,U19B200129) http://www.nsfc.gov.cn/and the National Science and technology Major Projects of China(No.2016ZX05027-004) 

主　　题：Seepage mechanism low-permeability gas reservoir threshold pressure gradient stress sensitivity control factors 

摘      要：The seepage mechanism plays a crucial role in low-permeability gas *** with conventional gas reservoirs,low-permeability sandstone gas reservoirs are characterized by low porosity,low permeability,strong heterogeneity,and high water ***,their percolation mechanisms are more *** present work describes a series of experiments conducted considering low-permeability sandstone cores under pressuredepletion conditions(from the Xihu Depression in the East China Sea Basin).It is shown that the threshold pressure gradient of a low-permeability gas reservoir in thick layers is positively correlated with water saturation and negatively correlated with permeability and *** reservoir stress sensitivity is related to permeability and rock *** sensitivity is generally low when permeability is high or in the early stage of gas reservoir *** is also shown that in sand conglomerates,especially the more sparsely filled parts,the interstitial materials among the conglomerates can be rapidly dislodged from the skeleton particles under *** material can therefore disperse,migrate,and block the pore throat producing serious,stress-sensitive damage.