Boundary Effect on Pore Pressure and Coal Seam Deformation during CO2 Sequestration in Coal Seam

Electronic journal of geotechnical engineering

Weiqun Liu *²  Zhengfeng Yi¹  Li Zhu³  Zhiqiang Shen¹ 

[1] School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China;State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 221008, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China*Corresponding author:;Ph. D. studentSchool of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China

关键词: CCS;    CO2 sequestration in coal seam;    boundary effect;    pore pressure distribution;    coal seam deformation;   

DOI  :  

来源: Oklahoma State University

【 摘 要 】

AmathematicalmodelbuiltforCO2permeatingthroughcoalseaminfiniteboundaryconditionissolvedbyusingLaplacetransformationandResiduecalculationmethodwiththepurposetostudytheinfluenceofboundaryconditionsonporepressureincoalseamduringinjection.Comparedwiththeresultininfiniteboundarycondition,furtherresearchshowsthatboundaryconditionsmakeadifferenceonthedistributionofcoalseamdeformation.Thefollowingresultscanbeobtainedfromthisstudy:(1)Displayedfromtheporepressuredistributionoftheboth,boundaryconditionshavelittleeffectonporepressureintheinitialstageofCO2injection.Whenthegaspermeatestothemodelboundary,thefiguresarenolongersimilar.(2)Theporepressurenearthewellboreincreasessharplyandtheporepressuregradientturnsouttoberatherhugeinthepreliminarystage.Astimegoesby,theporepressureincreasescontinuously,whilethepressuregradientdecreasesandfinallyapproachesthelevel.(3)VerticaldeformationequationcanbeacquiredbasedonLangmuirequationandtheaeolotropyofcoaladsorptionswelling.(4)Comparisonofcoalseamdeformationdistributioninfiniteandinfiniteboundaryconditionsshowsthatboundaryconditionsdonotaffectthedistributionofdeformationintheinitialstage,andthesetwokindofdistributiondifferfromoneandanotherwhenCO2permeatestotheboundary.

【 授权许可】

Unknown