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    Poroelastic Dual-Porosity Dual-Permeability Simulation of Pressure Transmission Test on Chemically Active Shale

    Source: Journal of Engineering Mechanics:;2017:;Volume ( 143 ):;issue: 006
    Author:
    Chao Liu
    ,
    Son K. Hoang
    ,
    Minh H. Tran
    ,
    Younane N. Abousleiman
    ,
    Russell T. Ewy
    DOI: 10.1061/(ASCE)EM.1943-7889.0001210
    Publisher: American Society of Civil Engineers
    Abstract: This paper presents the poroelastic dual-porosity dual-permeability analytical solutions simulating the pressure transmission test on chemically active shale, taking into account shale anisotropy and electrokinetic effects. Laboratory data from pressure transmission tests on a shale sample with high clay content were also simulated by using both single-porosity and dual-porosity dual-permeability analytical solutions. The matching provides estimates of crucial shale parameters, including hydraulic permeabilities, membrane coefficient, ions diffusion coefficients, and electroosmotic permeability. The matches between analytical solutions and laboratory data included not only pore pressure, which had been the focus of previous studies, but also axial strain. Such double matches provided additional confidence in the estimations compared with conventional simulations of only pore-pressure measurements. It was found that the single-porosity simulation could not match pore pressure and axial strain simultaneously. In particular, if all measured properties were honored, the simulation yielded higher pore-pressure and lower axial strain predictions than laboratory data. To obtain a good match in both pore pressure and axial strain by using the single-porosity simulation, some parameters such as Young’s moduli and cation exchange capacity (CEC) had to be changed substantially from measured values. Therefore, it was postulated that most of the volume change occurred within the clay grains and in between the clay layers, which cannot be captured by the single-porosity model. This hypothesis was further supported by the fact that the dual-porosity dual-permeability simulation was able to model the pressure transmission test very well for both pore pressure and axial strain. Sensitivity analysis was also conducted to identify parameters with the most influence on the outcomes of the pressure transmission test. This paper highlights the importance of accounting for shale dual-porosity dual-permeability and chemically active natures when simulating shale responses.
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      Poroelastic Dual-Porosity Dual-Permeability Simulation of Pressure Transmission Test on Chemically Active Shale

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    contributor authorChao Liu
    contributor authorSon K. Hoang
    contributor authorMinh H. Tran
    contributor authorYounane N. Abousleiman
    contributor authorRussell T. Ewy
    date accessioned2017-12-30T12:54:07Z
    date available2017-12-30T12:54:07Z
    date issued2017
    identifier other%28ASCE%29EM.1943-7889.0001210.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4243145
    description abstractThis paper presents the poroelastic dual-porosity dual-permeability analytical solutions simulating the pressure transmission test on chemically active shale, taking into account shale anisotropy and electrokinetic effects. Laboratory data from pressure transmission tests on a shale sample with high clay content were also simulated by using both single-porosity and dual-porosity dual-permeability analytical solutions. The matching provides estimates of crucial shale parameters, including hydraulic permeabilities, membrane coefficient, ions diffusion coefficients, and electroosmotic permeability. The matches between analytical solutions and laboratory data included not only pore pressure, which had been the focus of previous studies, but also axial strain. Such double matches provided additional confidence in the estimations compared with conventional simulations of only pore-pressure measurements. It was found that the single-porosity simulation could not match pore pressure and axial strain simultaneously. In particular, if all measured properties were honored, the simulation yielded higher pore-pressure and lower axial strain predictions than laboratory data. To obtain a good match in both pore pressure and axial strain by using the single-porosity simulation, some parameters such as Young’s moduli and cation exchange capacity (CEC) had to be changed substantially from measured values. Therefore, it was postulated that most of the volume change occurred within the clay grains and in between the clay layers, which cannot be captured by the single-porosity model. This hypothesis was further supported by the fact that the dual-porosity dual-permeability simulation was able to model the pressure transmission test very well for both pore pressure and axial strain. Sensitivity analysis was also conducted to identify parameters with the most influence on the outcomes of the pressure transmission test. This paper highlights the importance of accounting for shale dual-porosity dual-permeability and chemically active natures when simulating shale responses.
    publisherAmerican Society of Civil Engineers
    titlePoroelastic Dual-Porosity Dual-Permeability Simulation of Pressure Transmission Test on Chemically Active Shale
    typeJournal Paper
    journal volume143
    journal issue6
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)EM.1943-7889.0001210
    page04017016
    treeJournal of Engineering Mechanics:;2017:;Volume ( 143 ):;issue: 006
    contenttypeFulltext
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