A numerical study of CO2 flow through geopolymer under down-hole stress conditions: Application for CO2 sequestration wells

M.C.M. Nasvi , P.G. Ranjith , J. Sanjayan
{"title":"A numerical study of CO2 flow through geopolymer under down-hole stress conditions: Application for CO2 sequestration wells","authors":"M.C.M. Nasvi ,&nbsp;P.G. Ranjith ,&nbsp;J. Sanjayan","doi":"10.1016/j.juogr.2014.01.002","DOIUrl":null,"url":null,"abstract":"<div><p>The well cement used in injection/production wells plays a major role in the success of a carbon capture and storage project. Ordinary Portland cement (OPC)-based well cement has been used in injection/production wells and it has been found to be unstable in CO<sub>2</sub>-rich environments. In recent times, geopolymers have been tested as an alternative to OPC, and it has been found that geopolymers perform better than OPC under CO<sub>2</sub>-rich down-hole conditions. In this research work, a numerical study was performed to model CO<sub>2</sub> flow through geopolymer under down-hole stress conditions using COMSOL multiphysics. First, the model was validated using experimental flow results under drained triaxial conditions for various injection and confining pressures. The model was then extended to predict the flow characteristics such as permeability, Darcy’s velocity, CO<sub>2</sub> pressure and CO<sub>2</sub> concentration distributions in geopolymer under high injection and confining pressures. The CO<sub>2</sub> permeability values predicted by the model were in good agreement with the experimental permeability values for various injection (3–13<!--> <!-->MPa) and confining pressures (10–25<!--> <!-->MPa). The CO<sub>2</sub> permeability of geopolymer varies between 0.008 and 0.014<!--> <!-->μD for injection pressures of 15–40<!--> <!-->MPa and confining pressures of 30–45<!--> <!-->MPa. The flow parameters including Darcy’s velocity, CO<sub>2</sub> pressure and CO<sub>2</sub> concentration in geopolymer reduces with increase in confining pressures due to the reduction of pore volume with increase in confinement. Pressure-driven advection is the dominant CO<sub>2</sub> transport mechanism during the injection period compared to concentration-driven diffusion. CO<sub>2</sub> transport through geopolymer can be modelled using COMSOL multiphysics.</p></div>","PeriodicalId":100850,"journal":{"name":"Journal of Unconventional Oil and Gas Resources","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.juogr.2014.01.002","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Unconventional Oil and Gas Resources","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2213397614000032","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6

Abstract

The well cement used in injection/production wells plays a major role in the success of a carbon capture and storage project. Ordinary Portland cement (OPC)-based well cement has been used in injection/production wells and it has been found to be unstable in CO2-rich environments. In recent times, geopolymers have been tested as an alternative to OPC, and it has been found that geopolymers perform better than OPC under CO2-rich down-hole conditions. In this research work, a numerical study was performed to model CO2 flow through geopolymer under down-hole stress conditions using COMSOL multiphysics. First, the model was validated using experimental flow results under drained triaxial conditions for various injection and confining pressures. The model was then extended to predict the flow characteristics such as permeability, Darcy’s velocity, CO2 pressure and CO2 concentration distributions in geopolymer under high injection and confining pressures. The CO2 permeability values predicted by the model were in good agreement with the experimental permeability values for various injection (3–13 MPa) and confining pressures (10–25 MPa). The CO2 permeability of geopolymer varies between 0.008 and 0.014 μD for injection pressures of 15–40 MPa and confining pressures of 30–45 MPa. The flow parameters including Darcy’s velocity, CO2 pressure and CO2 concentration in geopolymer reduces with increase in confining pressures due to the reduction of pore volume with increase in confinement. Pressure-driven advection is the dominant CO2 transport mechanism during the injection period compared to concentration-driven diffusion. CO2 transport through geopolymer can be modelled using COMSOL multiphysics.

井下应力条件下CO2通过地聚合物流动的数值研究:在CO2固井中的应用
注采井中使用的水泥对碳捕集与封存项目的成功起着重要作用。普通波特兰水泥(OPC)基水泥已用于注/生产井,但在富含二氧化碳的环境中不稳定。近年来,人们对地聚合物作为OPC的替代品进行了测试,发现在富含二氧化碳的井下条件下,地聚合物的性能优于OPC。在这项研究工作中,利用COMSOL多物理场进行了一项数值研究,模拟了在井下应力条件下二氧化碳通过地聚合物的流动。首先,利用三轴排水条件下不同注入压力和围压下的流动实验结果对模型进行了验证。然后将该模型扩展到高注入压力和围压条件下地聚合物渗透率、达西速度、CO2压力和CO2浓度分布等流动特性的预测。在不同注入压力(3 ~ 13 MPa)和围压(10 ~ 25 MPa)下,模型预测的CO2渗透率值与实验渗透率值吻合较好。在注入压力为15 ~ 40 MPa、围压为30 ~ 45 MPa时,地聚合物的CO2渗透率变化范围为0.008 ~ 0.014 μD。随着围压的增大,孔隙体积减小,因此,达西速度、CO2压力和地聚合物中CO2浓度等流动参数随围压的增大而减小。与浓度驱动的扩散相比,压力驱动的平流是注入期间主要的CO2输送机制。CO2通过地聚合物的输送可以使用COMSOL多物理场进行模拟。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
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:481959085
Book学术官方微信