Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure

Ding, Ke; Wang, Lianguo; Ren, Bo; Li, Zhaolin; Wang, Shuai; Jiang, Chongyang

doi:10.3390/min11090956

Cited by 8 publications

(6 citation statements)

References 49 publications

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“…The sampling position of experimental rock samples is illustrated in Figure 1 [ 30 ], and they are processed into standard specimens, which are divided into six groups (18 sandstone samples in total) according to different experimental conditions. The specific parameters are shown in Table 1 [ 30 ] below.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…First, the samples were put into the atmosphere oven with the mouth sealed, and then the oven door was closed. Next, the heating rates were set to 10 °C/min and the heating temperatures were set according to Table 1 [ 30 ], with three samples in each temperature gradient. The heating treatment under each temperature gradient lasted for 2 h. After being heated, the samples were not taken out immediately until the oven had naturally cooled down to about 50 °C ( Figure 2 [ 30 ]).…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…Next, the heating rates were set to 10 °C/min and the heating temperatures were set according to Table 1 [ 30 ], with three samples in each temperature gradient. The heating treatment under each temperature gradient lasted for 2 h. After being heated, the samples were not taken out immediately until the oven had naturally cooled down to about 50 °C ( Figure 2 [ 30 ]). Soon after the samples were removed from the oven, their heights, volumes, and masses were measured.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

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Evaluation of Thermophysical and Mechanical Properties of Sandstone Due to High-Temperature

et al. 2022

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In this study, thermophysical and mechanical tests were conducted on sandstone samples from room temperature to 1000 °C. Based on the test results, the thermophysical properties (such as specific heat capacity, thermal conductivity, and thermal expansion coefficient) of sandstone after high-temperature treatment and the variations of mechanical properties (including peak strength, peak strain, elastic modulus, and whole stress-strain curve) with temperature were analyzed. Indeed, the deterioration law of sandstone after high-temperature treatment was also explored with the aid of a scanning electron microscope (SEM). The results show that with the increase in temperature, the specific heat capacity and thermal expansion coefficient of sandstone samples after high-temperature treatment increase first and then decrease, while the thermal conductivity gradually decreases. The range from room temperature to 1000 °C witnesses the following changes: As temperature rises, the peak strength of sandstone rises initially and falls subsequently; the elastic modulus drops; the peak strain increases at an accelerated rate. Temperature change has a significant effect on the deterioration rules of sandstone, and the increase in temperature contributes to the transition in the failure mode of sandstone from brittle failure to ductile failure. The experimental study on the thermophysical and mechanical properties of sandstone under the action of high temperature and overburden pressure has a guiding significance for the site selection and safety evaluation of UCG projects.

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Section: Experimental Materials and Methodsmentioning

confidence: 99%

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Section: Experimental Materials and Methodsmentioning

confidence: 99%

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Evaluation of Thermophysical and Mechanical Properties of Sandstone Due to High-Temperature

et al. 2022

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“…For instance, from the view of cavity expansion, Luo and Wang [8], Akbarzadeh and Chalaturnyk [9], Janoszek et al [10] investigated the confining rock during coal combustion, suggesting obvious changes in the mechanical properties of rock at high temperature and pore pressure. The permeability of near-field rock of a UCG cavity, as announced by Otto and Kempka [11], Wałowski [12], Madiutomo et al [13], Ding et al [14], experiences significant change during cavity expansion, while that of far-field rock is influenced to a limited degree. Meng et al [5], Duan et al [15], Jin et al [16] investigated the fracture characteristics, evolution law and influence tendency induced by pore pressure, thermal damage, etc.…”

Section: Introductionmentioning

confidence: 93%

Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification

Dong

Zhao

et al. 2022

Energies

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The evolution of fracture zone controls the safety of underground coal gasification (UCG) in terms of gas emission and water leakage. In order to understand the fracture propagation in the confining rock of a UCG cavity with various influence factors, this paper implemented a set of numerical models based on different geological and operating conditions. Analysis was implemented on the mechanism of fracture propagation and its evolution characteristics, suggesting that (a) continuum expansion of the cavity leads a near-field fracture circle in confining rock initially, followed by the roof caving and successive propagation of shear band. (b) The key observed influence factors of fracture propagation are the grade of confining rock, overburden pressure, dimension of the cavity and gasifying pressure, the linear relationships between them, and the fracture height. Additionally, the fracture depth in the base board was mainly caused by tensile fracture. (c) A model was proposed based on the evolution of fracture height and depth in roof and base board, respectively. Validation of this model associated with orthogonal tests suggests a good capacity for predicting fracture distribution. This paper has significance in guiding the design of the gasifying operation and safety assessment of UCG cavities.

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“…The study showed that the increase in temperature could significantly degrade the physical properties of rock, and the increase in confining pressure could improve the strength and deformation of rock. Ding et al [36] conducted a CO 2 seepage test on sandstone under the action of thermodynamic coupling, and the study showed that the permeability of sandstone decreased with the rise in stress, and first decreased and then increased with the increase in temperature.…”

Section: Introductionmentioning

confidence: 99%

Study on the Accuracy of Fracture Criteria in Predicting Fracture Characteristics of Granite with Different Occurrence Depths

et al. 2022

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The fracture network of a deep geothermal reservoir forms the place for heat exchange between injected fluid and rock mass with high temperature. The fracture resistance ability of reservoir rocks will affect the formation of fracture-network structure, heat exchange and transmission characteristics, and reservoir mechanical stability. However, there are few reports on the fracture toughness and trajectory prediction of geothermal reservoirs with different depths. In this paper, the modified maximum tangential stress criterion (MMTS) is analyzed. The results show that the experimental data are significantly different from the theoretical estimate of MMTS under the influence of different occurrence depths. It is found that the fracture process zone (FPZ) seriously affects the accuracy of predicting fracture initiation angle and mixed-mode (I+II) fracture toughness by MMTS. The FPZ value, considering the influence of different occurrence depths, is modified, and the accuracy of MMTS in predicting the fracture mechanical characteristics of granite is improved. In addition, the mechanical test results show that the Brazilian splitting strength (σt) of granite fluctuates increase with the increase in temperature. With the increase in deviatoric stress, the Brazilian splitting strength and the Brazilian splitting modulus of rock show a trend of first increasing, then decreasing, and then increasing.

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Experimental Study on Relative Permeability Characteristics for CO2 in Sandstone under High Temperature and Overburden Pressure

Cited by 8 publications

References 49 publications

Evaluation of Thermophysical and Mechanical Properties of Sandstone Due to High-Temperature

Evaluation of Thermophysical and Mechanical Properties of Sandstone Due to High-Temperature

Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification

Study on the Accuracy of Fracture Criteria in Predicting Fracture Characteristics of Granite with Different Occurrence Depths

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