Effect of temperature on shale strength under dynamic impact loading

Yang, Guoliang; Liu, Jie; Li, Xuguang; Bi, Jingjiu

doi:10.1007/s12517-020-05435-2

Cited by 17 publications

(5 citation statements)

References 15 publications

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“…Some typical stress–strain curves are presented in Figure 6 to demonstrate the correlation between temperature and the dynamic mechanical properties of shale. In the low-temperature region of 25–200 °C, little change occurs that is consistent with the result reported by Yang et al 7 When the temperature is over 200 °C, the curves evolve rapidly with a decrease in the peak of stress. The slope of the post-peak curve decreases with the elevated temperature, indicating a reduction in rock brittleness.…”

Section: Resultssupporting

confidence: 92%

“…The elevated temperature can also change the chemical composition of shale. It has been identified as a pivotal parameter in shale gas production and has many applications in many fields, such as the evaluation of shale gas productivity , and gas sorption capacity. , Up to date, it is difficult to quantify the effects of high temperature on shale formations including the changes in mineral composition and mechanical properties . Therefore, we propose a quantitative method to characterize the effects of temperature on the chemical–mechanical properties of shale rocks.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Temperature Dependence of the Chemical–Mechanical Properties of the Wufeng–Longmaxi Shale

Zhai

et al. 2022

ACS Omega

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Shale rocks have been widely investigated to evaluate the productivity of oil/gas. The high temperature generated by the explosive fracturing to stimulate the gas reservoir has a significant impact on the chemical−mechanical properties of shale rocks. Pioneering works have been carried out at temperatures below 500 °C, but little has been done to quantify the correlation between the chemical and mechanical properties of shale at temperatures above 500 °C. Therefore, an experimental study on the effect of temperature on the chemical−mechanical properties of shale rocks is presented in this paper. The temperatures used in our experiments are between 0 and 800 °C. Results indicate that there exist strong chemical reactions leading to a big reduction in the sample's weight and mechanical strength for a temperature over 500 °C. Thermogravimetric analysis data demonstrates that the weight of shale powders has little change below 400 °C and largely decreases after 600 °C. It shows that the chemical reaction rate corresponding to shale compositions varies with temperature. X-ray diffraction and Fourier transform infrared are integrated to quantify the occurrence of contained reactions including the decomposition of kerogen, carbonates, and quartz transition. This can provide a temperature range for all possible reactions. Changes in the compositional information of shale samples have been proven to significantly influence the mechanical properties. A 25% decrease in dynamic Young's modulus emerges as the temperature approaches 700 °C. As the brittle minerals, for instance, carbonates, decrease with temperature, a brittle-ductile transition happens in shale. This work provides very meaningful results different from that at low temperatures to help people better understand the effects of high temperatures in many fields, such as explosive fracturing and radioactive waste disposal.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Investigation of the Temperature Dependence of the Chemical–Mechanical Properties of the Wufeng–Longmaxi Shale

Zhai

et al. 2022

ACS Omega

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“…Alteration of the compressive strength of shale has generated much interest over the past decades, and several researchers tried to understand the reasons and effects of it on the overall integrity of shale to provide methods and techniques for safe shale drilling. − While these studies presented great results and analysis and shed light on the causes and consequences of the alteration of compressive strength of shale on the stability of drilled wellbore, these studies did not monitor the development of shale’s compressive strength alteration (reduction or enhancement) as a function of time. Their recommendations were based on the final state of shale’s compressive strength measurements.…”

Section: Background and Prior Workmentioning

confidence: 99%

Time-Dependent Measurements of Shale’s Compressive Strength When Contacting Ionic Solutions

Al-Duaij

Al-Bazali

2022

ACS Omega

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Time-dependent measurements of uniaxial compressive strength, and ionic and water transport were conducted to analyze the alteration of shale’s strength, as a function of time, when exposed to aqueous solutions. Results showed that the compressive strength of shale is time-dependent, and it relies highly on water activity and ionic concentration differences between shale and aqueous solutions. Data obtained from this work showed that time-dependent water and ion transport into shale correlated well with compressive strength measurements. It was revealed that initial water extraction by osmosis strengthened shale until ions and their associated water clouds invaded shale causing reduction in its strength. It is quite possible that water flow by diffusion osmosis may have counteracted water flow by chemical osmosis rendering ionic diffusion as the primary regulator on shale strength alteration. Furthermore, it was found that alteration of compressive strength when it interacted with aqueous solutions could be adequately explained within the confines of chemical osmosis, ionic diffusion, and diffusion osmosis. Data suggests that the impact of chemical osmosis on compressive strength is observed earlier than ionic diffusion and diffusion osmosis. Data also showed that potassium ions seem to contribute to the enhancement of the compressive strength of shale.

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“…Zhang [20] conducted the separation Hopkinson bar compression experiment for the high strain rate of shale, and preliminarily explored the dynamic constitutive relationship of shale. Yang et al [21] used the separated Hopkinson pressure bar system to carry out impact tests on shale. It was concluded that the damage degree of shale significantly increases with the increase in impact velocity under different strain rates, and that the ductility and failure resistance of rock materials are improved under passive confining pressure.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties of Heat-Treated Shale under Different Temperatures

Gao,

Deng,

Sun

et al. 2023

Applied Sciences

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As a typical rock, shale’s reservoir depth is about 1500–4000 m, and the temperature of the shale reservoir at this depth is 150 °C. Therefore, in order to study the dynamic strength of shale at this temperature, it is necessary to consider the effects of temperature and strain rate on the dynamic strength of shale, and then establish the damage constitutive model of shale. This paper took black shale from the Sichuan Basin as the research object, combined it with the separated Hopkinson bar experiment and temperature control system, and conducted the Hopkinson bar experiment on shale at room temperature, 60 °C, 90 °C, 120 °C, and 150 °C, and at three groups of air pressures of 0.2 MPa, 0.3 MPa, and 0.4 MPa. The stress–strain curves of shale at the same strain rate and different temperature and at the same temperature and different strain rate were obtained. In the temperature difference range of this experiment, the dynamic strength of the sample presented two opposite trends (increasing and decreasing) with the increase in temperature, which was determined via the direction of the bedding. The peak strength linearly increased with the increase in strain rate. Based on the Weibull statistical distribution and the D–P failure criterion, a statistical damage constitutive model of shale dynamic strength considering the effects of temperature and strain rate was obtained. By modifying the parameters F0 and m, the dynamic strength statistical damage constitutive model of shale was in good agreement with the experimental results.

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Effect of temperature on shale strength under dynamic impact loading

Cited by 17 publications

References 15 publications

Investigation of the Temperature Dependence of the Chemical–Mechanical Properties of the Wufeng–Longmaxi Shale

Investigation of the Temperature Dependence of the Chemical–Mechanical Properties of the Wufeng–Longmaxi Shale

Time-Dependent Measurements of Shale’s Compressive Strength When Contacting Ionic Solutions

Dynamic Mechanical Properties of Heat-Treated Shale under Different Temperatures

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