考虑层理取向的页岩产气过程中渗透率演化:孔隙弹性和气动力的相对贡献

IF 5.5 0 ENERGY & FUELS
Yufei Chen , Weimeng Chen , Qiangui Zhang , Xiangyu Fan , Changbao Jiang , Chuanyao Zhong , Pengfei Zhao
{"title":"考虑层理取向的页岩产气过程中渗透率演化:孔隙弹性和气动力的相对贡献","authors":"Yufei Chen ,&nbsp;Weimeng Chen ,&nbsp;Qiangui Zhang ,&nbsp;Xiangyu Fan ,&nbsp;Changbao Jiang ,&nbsp;Chuanyao Zhong ,&nbsp;Pengfei Zhao","doi":"10.1016/j.jgsce.2025.205737","DOIUrl":null,"url":null,"abstract":"<div><div>Gas recovery and permeability evolution in shale reservoirs with various bedding orientations during the lifetime gas production are dynamically controlled by the coupling of poroelasticity and gas dynamics, however, the relative contributions of both effects to shale permeability still remain unclear. In this study, we experimentally and theoretically investigated the changes in shale permeability using shale samples with four separate bedding angles (0°, 30°, 60°, and 90°), under both constant effective stress and constant confining pressure conditions. Results show that an increase in bedding angle generally enhances the effect of poroelasticity on shale permeability but suppresses that of gas dynamics. Also, utilizing the effective stress coefficient <em>χ</em> would unify the permeability evolutions at relatively high pore pressures (approximately &gt; 6 MPa). A theoretical permeability model was derived and it could reasonably match the permeability data. Most importantly, poroelasticity and gas dynamics contribute oppositely to the overall shale permeability evolution and an almost 25-percent contribution of gas dynamics would result in a permeability rebound. We further provided a new method to evaluate the deformation-induced reduction of gas dynamics effect on gas flow and this reduction increases with increasing pore pressure but decreasing bedding angle. Finally, we determined the critical pore pressure below which the gas flow behavior in shale reservoirs will transform from poroelasticity-to gas dynamics-dominated to enhance the apparent permeability. This parameter, approximately ranging from 6.5 to 9 MPa, increases in deep- but decreases in inclined-shale reservoirs. The present study aims to provide a theoretical support for the high-efficiency development and high-precision production prediction of shale gas.</div></div>","PeriodicalId":100568,"journal":{"name":"Gas Science and Engineering","volume":"143 ","pages":"Article 205737"},"PeriodicalIF":5.5000,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Shale permeability evolution during lifetime gas production considering bedding orientation: Relative contributions of poroelasticity and gas dynamics\",\"authors\":\"Yufei Chen ,&nbsp;Weimeng Chen ,&nbsp;Qiangui Zhang ,&nbsp;Xiangyu Fan ,&nbsp;Changbao Jiang ,&nbsp;Chuanyao Zhong ,&nbsp;Pengfei Zhao\",\"doi\":\"10.1016/j.jgsce.2025.205737\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Gas recovery and permeability evolution in shale reservoirs with various bedding orientations during the lifetime gas production are dynamically controlled by the coupling of poroelasticity and gas dynamics, however, the relative contributions of both effects to shale permeability still remain unclear. In this study, we experimentally and theoretically investigated the changes in shale permeability using shale samples with four separate bedding angles (0°, 30°, 60°, and 90°), under both constant effective stress and constant confining pressure conditions. Results show that an increase in bedding angle generally enhances the effect of poroelasticity on shale permeability but suppresses that of gas dynamics. Also, utilizing the effective stress coefficient <em>χ</em> would unify the permeability evolutions at relatively high pore pressures (approximately &gt; 6 MPa). A theoretical permeability model was derived and it could reasonably match the permeability data. Most importantly, poroelasticity and gas dynamics contribute oppositely to the overall shale permeability evolution and an almost 25-percent contribution of gas dynamics would result in a permeability rebound. We further provided a new method to evaluate the deformation-induced reduction of gas dynamics effect on gas flow and this reduction increases with increasing pore pressure but decreasing bedding angle. Finally, we determined the critical pore pressure below which the gas flow behavior in shale reservoirs will transform from poroelasticity-to gas dynamics-dominated to enhance the apparent permeability. This parameter, approximately ranging from 6.5 to 9 MPa, increases in deep- but decreases in inclined-shale reservoirs. The present study aims to provide a theoretical support for the high-efficiency development and high-precision production prediction of shale gas.</div></div>\",\"PeriodicalId\":100568,\"journal\":{\"name\":\"Gas Science and Engineering\",\"volume\":\"143 \",\"pages\":\"Article 205737\"},\"PeriodicalIF\":5.5000,\"publicationDate\":\"2025-07-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Gas Science and Engineering\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2949908925002018\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"0\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Gas Science and Engineering","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2949908925002018","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

摘要

不同层理取向页岩储层在产气过程中的采收率和渗透率演化受孔隙弹性和气体动力学耦合的动态控制,但两者对页岩渗透率的相对贡献尚不清楚。在本研究中,我们通过实验和理论研究了在恒定有效应力和恒定围压条件下,具有4种不同层理角度(0°、30°、60°和90°)的页岩样品的渗透率变化。结果表明:层理角的增大总体上增强了孔隙弹性对页岩渗透率的影响,但抑制了气动力对渗透率的影响。此外,利用有效应力系数χ可以统一较高孔隙压力(约为>;6 MPa)。推导了理论渗透率模型,该模型能较好地拟合渗透率数据。最重要的是,孔隙弹性和气体动力学对整体页岩渗透率的影响是相反的,气体动力学对渗透率的影响接近25%,就会导致渗透率反弹。进一步提供了一种新的方法来评价变形诱导的气体动力学降低对气体流动的影响,这种降低随孔隙压力的增加而增加,但随层理角度的减小而增加。最后,我们确定了临界孔隙压力,在该临界孔隙压力下,页岩储层的气体流动行为将从孔隙弹性为主转变为以气体动力学为主,从而提高表观渗透率。该参数约为6.5 ~ 9 MPa,在深层页岩储层中增大,在倾斜页岩储层中减小。本研究旨在为页岩气高效开发和高精度产量预测提供理论支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shale permeability evolution during lifetime gas production considering bedding orientation: Relative contributions of poroelasticity and gas dynamics
Gas recovery and permeability evolution in shale reservoirs with various bedding orientations during the lifetime gas production are dynamically controlled by the coupling of poroelasticity and gas dynamics, however, the relative contributions of both effects to shale permeability still remain unclear. In this study, we experimentally and theoretically investigated the changes in shale permeability using shale samples with four separate bedding angles (0°, 30°, 60°, and 90°), under both constant effective stress and constant confining pressure conditions. Results show that an increase in bedding angle generally enhances the effect of poroelasticity on shale permeability but suppresses that of gas dynamics. Also, utilizing the effective stress coefficient χ would unify the permeability evolutions at relatively high pore pressures (approximately > 6 MPa). A theoretical permeability model was derived and it could reasonably match the permeability data. Most importantly, poroelasticity and gas dynamics contribute oppositely to the overall shale permeability evolution and an almost 25-percent contribution of gas dynamics would result in a permeability rebound. We further provided a new method to evaluate the deformation-induced reduction of gas dynamics effect on gas flow and this reduction increases with increasing pore pressure but decreasing bedding angle. Finally, we determined the critical pore pressure below which the gas flow behavior in shale reservoirs will transform from poroelasticity-to gas dynamics-dominated to enhance the apparent permeability. This parameter, approximately ranging from 6.5 to 9 MPa, increases in deep- but decreases in inclined-shale reservoirs. The present study aims to provide a theoretical support for the high-efficiency development and high-precision production prediction of shale gas.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
CiteScore
11.20
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信