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Effect of stress-dependent microannulus aperture on well leakage

Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 1967-1976页

作者： Meng Meng Luke P.Frash J.William Carey Mohamed Mehana Wenfeng Li Bailian Chen Earth and Environmental Sciences Los Alamos National LaboratoryLos AlamosNMUSA

Debonding at the cement-casing interface is recognized as a principal failure mechanism leading to CO_(2) leakage in *** detachment gives rise to a microannulus,which notably possesses greater permeability than undamaged cement,undermining its sealing ***,the permeability of the microannulus is regarded as a uniform value throughout the ***,fundamentally,a microannulus is one type of fracture,and its gap or aperture size is affected by the effective *** this work,we developed a unique experimental *** equipment facilitates the curing of cement inside a steel casing,the formation of a microannulus between the casing and the cement,and the investigation of the fluid flow dynamics along the microannulus under laboratory-replicated in situ *** microannulus was formed by injecting fluid from one end of the setup,and receiving similar amount of fluid on the other end signified the development of the leakage ***,strain gauges affixed to the casing’s external surface yielded key information on the microannulus’s opening and *** observed a noticeable decline in microannulus hydraulic aperture(or permeability)in relation to effective stress and an exponential equation fits their *** findings also indicate a distinct behavior when comparing liquid CO_(2) with ***,it is easier for liquid CO_(2) to create the ***,the hydraulic aperture range for this microannulus(0.7-6 mm)is considerably smaller than that created by water flow(2-17 mm).Finally,we integrated the stressdependent microannulus aperture size into the combined analysis of well mechanical integrity and well *** outcomes consistently demonstrated that when factoring in the stress-dependent aperture sizes,the leakage rates are 3e5 times compared to a fixed aperture *** traditional assumption of a constant aperture significantly underestimates fluid leakage risks.

关键词： Microannulus Leakage assessment Aperture size triaxial experiment Carbon sequestration

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experimental investigation on deformation characteristics and permeability evolution of rock under confining pressure unloading conditions

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Journal of Central South University 2018年第8期25卷 1987-2001页

作者： CHEN Xu TANG Chun-an YU Jin ZHOU Jian-feng CAI Yan-yan School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China School of Civil and Hydraulic Engineering Dalian University of TechnologyDalian 116024China Fujian Research Center for Tunneling and Urban Underground Space Engineering Huaqiao UniversityXiamen 361021China

Deformation behavior and hydraulic properties of rock are the two main factors that influence safety of excavation and use of rock engineering due to in situ stress *** primary objective of this study is to explore deformation characteristics and permeability properties and provide some parameters to character the rock under unloading conditions.A series of triaxial tests with permeability and acoustic emission signal measurement were conducted under the path of confining pressure unloading prior to the peak *** behavior and permeability evolution in the whole stress–strain process based on these experimental results were analyzed in *** demonstrate that,under the confining pressure unloading conditions,a good correspondence relationship among the stress–axial strain curve,permeability–axial strain curve and acoustic emission activity pattern was *** the confining pressure was unloaded,the radial strain grew much faster than the axial strain,which induced the volumetric strain growing *** failures under confining pressure unloading conditions featured brittle shear failure with a single macro shear rupture *** the decrease in deformation modulus during the confining pressure unloading process,the damage variable gradually increases,indicating that confining pressure unloading was a process of damage accumulation and strength *** the entire loading and unloading process,there was a certain positive correlation between the permeability and volumetric strain.

关键词： unloading rock mechanics permeability evolution triaxial experiment acoustic emission sandstone

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