Study of Mechanical Properties of Vindhayan Shaly Rocks at Elevated temperature

Jha, Manish Kumar; Verma, A. K.; Gautam, Prabhat; Negi, Anil

doi:10.1007/s12594-017-0714-8

Cited by 17 publications

(9 citation statements)

References 21 publications

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“…In recent decades, several studies have focused on understanding the mechanical behavior of progressive damage and microscopic damage mechanisms of rocks under various temperature–pressure coupling conditions using experimental and numerical simulation techniques 10–15 . These studies were conducted to investigate the microscopic mechanisms of complex macroscopic properties of rock materials and establish theories and methods for cross‐scale correlation and multi‐scale analyses of macroscopic and microscopic properties.…”

Section: Introductionmentioning

confidence: 99%

“…under various temperature-pressure coupling conditions using experimental and numerical simulation techniques. [10][11][12][13][14][15] These studies were conducted to investigate the microscopic mechanisms of complex macroscopic properties of rock materials and establish theories and methods for cross-scale correlation and multi-scale analyses of macroscopic and microscopic properties. Among them, the experimental studies generally combined tri-axial compression tests with microscopic monitoring methods (acoustic emission, scanning electron microscopy, and computed tomography (CT)) to characterize and analyze the progressive evolution of cracks.…”

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confidence: 99%

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Study on rock mechanics characteristics of deep shale in Luzhou block and the influence on reservoir fracturing

Han

Liu

et al. 2022

Energy Science & Engineering

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This paper aims to study the influence of deep formation conditions on the mechanical properties of shale, which is of great significance for the engineering application of efficient development of deep shale gas. In this study, a real-time high-temperature (25°C-170°C) triaxial compression experiment was first carried out on shale samples. Then, based on the analysis results of rock mineral components and discrete element numerical simulation technology, a thermo-mechanical coupling model (TMCM) was constructed, and the accuracy of the numerical model was verified. Finally, based on the micromechanical parameters, a numerical fracturing mechanism model considering the influence of temperature, natural fracture density, and fracture length was established, and the influence of current reservoir conditions on hydraulic fracturing was discussed. The results show that confining pressure has a greater effect on rock mechanics than temperature.When the temperature exceeds 110°C, the plasticity of rock samples increases, and the fracture morphology becomes complex. In addition, the increase in temperature promotes the fracture of microcracks to a certain extent. The research results are expected to provide a sufficient theoretical basis for the development and utilization of deep shale gas resources. K E Y W O R D Sdeep shale gas, PFC, rock mechanics, temperature, XRD | INTRODUCTIONShale gas, an unconventional energy source with abundant reserves, is a clean and environmentally friendly natural gas that has become an important strategic resource in China. 1,2 Deep shale gas in China has a great potential for exploitation. 3 However, a series of technological difficulties exist. 4 In particular, the high-temperature (HT) and high-pressure (HP) geological environment of deep reservoirs results in the transformation of rock mechanical properties, 5 which has a significant impact on geological evaluation, drilling technology, and fracturing. [6][7][8][9] Therefore, this requires considerable attention.In recent decades, several studies have focused on understanding the mechanical behavior of progressive damage and microscopic damage mechanisms of rocks

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Study on rock mechanics characteristics of deep shale in Luzhou block and the influence on reservoir fracturing

Han

Liu

et al. 2022

Energy Science & Engineering

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“…They reported that with increasing temperature, Young's modulus and the compressive failure strength decreased significantly, but the overall deformability and the nonlinearity of the failure surface increased gradually. Jha et al (2015Jha et al ( , 2017 studied the effects of thermal treatment on the physical and mechanical properties of two types of Indian shale and discovered that the porosity of the two shales significantly increased with increasing temperature, whereas the density and the uniaxial compressive and tensile strength of the two shales decreased in varied magnitudes. Mohamadi and Wan (2016) conducted hightemperature triaxial compression tests on shale specimens with horizontal bedding planes and found that shale specimens exhibited a considerable degree of strain-softening brittleness under low confining pressure.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of shale after being subjected to high temperatures under uniaxial compression

Huang

Guo

2021

Bull Eng Geol Environ

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Uniaxial compression tests and acoustic emission (AE) monitoring of shale specimens with horizontal and perpendicular bedding planes after being subjected to high temperatures were conducted to investigate the effect of a high-temperature environment on shale failure characteristics. The results reveal that specimens in the two bedding directions experienced severe rockburst failure. The rockburst processes of all the tested specimens were similar and can be divided into two main stages according to the specific failure characteristics, spalling stage, and ejection stage, and the increasing temperature had a significant effect on the rockburst characteristics of specimens in the two bedding directions at each stage. The fractal dimension of specimens in the two bedding directions increased with increasing temperature and increased much more for specimens with perpendicular bedding planes. The high-energy AE signals induced by the rockburst failure of specimens became more significant with increasing temperature, and the step-jump frequency of cumulative AE energy for specimens with perpendicular bedding planes increased gradually. The sudden drop in the amplitude of the AE b value resulting from spalling, ejection, and monolithic failure became larger for specimens in the two bedding directions with increasing temperature. Before the peak stress, the AE b value of specimens with horizontal bedding planes showed a stable period that was unaffected by increasing temperature, while the AE b value of specimens with perpendicular bedding planes also showed a plateau period in the prepeak stage when the temperature was lower than 100 °C and disappeared when the temperature exceeded 100 °C.

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“…Mohamadi et al [18] conducted a series of triaxial tests on shale at different temperatures and discussed in detail the influence of temperature on shale strength. Jha et al [19] conducted uniaxial compression tests and tensile strength tests at different temperatures from normal temperature to 900°C and studied in detail the influence of high temperature on the physical and mechanical properties and uniaxial compressive strength of shale. Rybacki et al [20] conducted creep tests on shale with different temperatures (50~200°C) and different confining pressures (50~200 MPa) to study the influence of temperature and confining pressure on creep characteristics.…”

Section: Introductionmentioning

confidence: 99%

Study on the Damage Evolution Process and Fractal of Quartz-Filled Shale under Thermal-Mechanical Coupling

Song

et al. 2021

Geofluids

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Filling of brittle minerals such as quartz is one of the main factors affecting the initiation and propagation of reservoir fractures in shale fracturing, in order to explore the failure mode and thermal damage characteristics of quartz-filled shale under thermal-mechanical coupling. Combining the theory of damage mechanics and thermoelasticity, RFPA2D-Thermal is used to establish a numerical model that can reflect the damage evolution of shale under thermal-solid coupling, and the compression test under thermal-mechanical coupling is performed. The test results show that during the temperature loading process, there is a temperature critical value between 60°C and 75°C. When the temperature is less than the critical temperature, the test piece unit does not appear obvious damage. When the temperature is greater than the critical temperature, the specimen unit will experience obvious thermal damage, and the higher the temperature, the more serious the cracking. Under the thermal-mechanical coupling of shale, the tensile strength and elastic modulus of shale show a decreasing trend with the increase of temperature. The failure modes of shale under thermal-solid coupling can be roughly divided into three categories: “V”-shaped failure (30°C, 45°C, and 75°C), “M”-shaped failure (60°C), and inverted “λ”-shaped failure (90°C). The larger the fractal dimension, the more complex the failure mode of the specimen. The maximum fractal dimension is 1.262 when the temperature is 60°C, and the corresponding failure mode is the most complex “M” shape. The fractal dimension is between 1.071 and 1.189, and the corresponding failure mode is “V” shape. The fractal dimension is 1.231, and the corresponding failure mode is inverted “λ” shape.

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Study of Mechanical Properties of Vindhayan Shaly Rocks at Elevated temperature

Cited by 17 publications

References 21 publications

Study on rock mechanics characteristics of deep shale in Luzhou block and the influence on reservoir fracturing

Study on rock mechanics characteristics of deep shale in Luzhou block and the influence on reservoir fracturing

Failure characteristics of shale after being subjected to high temperatures under uniaxial compression

Study on the Damage Evolution Process and Fractal of Quartz-Filled Shale under Thermal-Mechanical Coupling

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