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Effects of external temperature and dead volume on laboratory measurements of pore pressure and injected volume in a rock fracture

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1461-1469页

作者： Yinlin Ji Christian Kluge Hannes Hofmann Guido Blöcher Helmholtz Centre Potsdam GFZ German Research Centre for GeosciencesPotsdam14473Germany State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou221116China

The accurate evaluation of pore pressure and injected volume is crucial for the laboratory characterization of hydromechanical responses of rock fractures. This study reports a series of laboratory experiments to systematically demonstrate the effects of external temperature and dead volume on laboratory measurements of pore pressure and injected volume in a rock fracture. We characterize the hydraulic aperture of the fracture as a function of effective normal stress using the exponential aperture model.This model is then employed to predict the pore pressure change and injected volume in the fracture without the influences of external temperature and dead volume. The external temperature changes in the cyclic loading test due to the Joule-Thompson effect for fluids. The effect of external temperature on pore pressure change in the fracture can be well explained by thermal pressurization of fluids. Our results also show that the external dead volume can significantly lower the pore pressure change in the fracture during the cyclic loading test under undrained conditions. The injected volume can also be substantially enlarged due to the external dead volume in a typical pore pressure system. Internal measurement of the pore pressure in the fracture using a fiber optic sensor cannot exclude the influences of external temperature and dead volume, primarily because of the good hydraulic communication between the fracture and pore pressure system. This study suggests that the effects of external temperature and dead volume on pore pressure response and injected volume should be evaluated for accurate laboratory characterization and inter-laboratory comparison.

关键词： Fracture aperture Thermal pressurization External dead volume pressure attenuation Injected volume Fiber optic sensor

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A new measurement method for radial permeability and porosity of shale

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Petroleum Research 2017年第2期2卷 178-185页

作者： Zehao Yang Mingzhe Dong Department of Chemical and Petroleum Engineering University of CalgaryCalgary AB T2N 1N4Canada School of Petroleum Engineering China University of PetroleumShandong 266580China

To more conveniently and accurately obtain the radial permeability of shale,a new measurement method was proposed for the pressure attenuation of radial permeability and porosity in shale.Through experiments,this method could be used to get the pressure attenuation curve in annular space between the core and inner wall of PVT vessel under the helium along shale radial flow.Accordingly,a mathematical model was established to obtain the semi-analytical solution between pressure and time in the radial model.Meanwhile,through fitting the experimental results,the concentration conductivity and porosity of shale were obtained,and their relationship was used to derive the radial permeability of shale.This method was adopted to measure the permeability and porosity of two cores under three sets of different initial pressures in the annular space.The permeability test results were compared with those obtained by the conventional Dicker method and Smits pressure-attenuation method,and the porosity test results were also compared with those obtained by the conventional porosimeter,thus the feasibility and superiority of this method were confirmed.In contrast to the conventional pressureattenuation methods,this new model had advantages of simpler instruments and more convenient operation,and was also easy to measure the radial permeability and porosity of shale.

关键词： Radial permeability and porosity pressure attenuation Annular space Concentration conductivity coefficient Shale

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