Experimental investigation on the influence of sub- and super-critical CO2 saturation time on the permeability of fractured shale

Zhou, Junping; Tian, Shifeng; Zhou, Lei; Xian, Xuefu; Yang, Kailun; Jiang, Yongdong; Zhang, Chengpeng; Guo, Yuan-Chen

doi:10.1016/j.energy.2019.116574

Cited by 59 publications

(30 citation statements)

References 70 publications

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“…This injection may exert significant impacts on the stimulated reservoir volume (SRV) for hydrocarbon (oil and gas) recovery and sealing behaviour for carbon (CO2) sequestration (Middleton et al, 2015;Tayari & Blumsack, 2020). Abundant work has examined CO2 flows in porous media to define interactions between gas and matrix and the corresponding effect on both permeabilities (Ao, Lu, Tang, Chen, & Li, 2017;Zhou et al, 2020) and the mechanical properties of rock (Yin, Zhou, Jiang, Xian, & Liu, 2016;Yin et al, 2017). Less clarity is available for CO2 flow in propped fractures, where additional complexity is added with grain-fracture interactions to CO2.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures

Hou

Elsworth

2021

Fuel

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Section: Introductionmentioning

confidence: 99%

Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures

Hou

Elsworth

2021

Fuel

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“…Moreover, proppants and certain chemical agents are typically used to improve the effect of hydraulic fracturing and maintain the stability of the fracture. ese proppants and chemical reagents may enter the formation water and, consequently, pollute and damage the CBM reservoirs [16][17][18]. In addition, high-pressure equipment required to perform hydraulic fracturing in underground coal mines should have more complex sealing requirements, which significantly increases the safety risks.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

Wang

Cheng

2021

Advances in Civil Engineering

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In the process of improving coalbed permeability through pulse hydraulic fracturing, the cyclic loading effect influences the characteristics of micropores in coal matrix, thus affecting the process of gas migration. Therefore, it is essential to investigate the effect of cyclic loading on the pore structure of coal. Seven groups of loading tests at different frequencies and amplitudes were conducted on anthracite coal obtained from Shanxi Province, China, using a fatigue-testing machine. Subsequently, using a PoreMaster GT-60 Mercury-intrusion apparatus, the influence of the frequency and amplitude on the structural characteristics (including mercury-injection and mercury-ejection curves, pore size distribution, porosity, and specific surface area) of pores in coal samples was analyzed. Finally, the law and mechanism of action of the loading frequency and amplitude on pores in coal samples were comprehensively analyzed. The test results showed that, in the case of maintaining the sine-wave amplitude unchanged during loading while altering the loading frequency, the overall porosity and pore volume rise at different degrees. The growth of the loading frequency presents a more significant promotive effect on the initiation and development of pores and fractures. Moreover, it drives the transformation of micropores and transition pores into mesopores and macropores, thus increasing the proportion of seepage pores. Under the condition of large sine-wave amplitude during loading, macropores and mesopores are subjected to the repeated action of the external force, thereby reducing the overall porosity. In addition, the volume of the seepage pores declines, and the number of the coalesced pores decreases. Finally, in light of these results, the implications of frequency and amplitude selection in the process of pulse hydraulic fracturing are discussed. Therefore, the results of this research will provide an important theoretical basis for the field application of pulse hydraulic fracturing technology in coal mines.

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“…Shale permeability is an important parameter for productivity evaluation and economic development of shale reservoirs [1,2]. While a shale reservoir is usually dense, with low matrix permeability and high clay content, its permeability is greatly affected by bedding occurrence and hydration of rock [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Lamina Density and Occurrence on the Permeability of Lamellar Shale after Hydration

et al. 2021

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The characteristics of laminae in lamellar shale oil reservoirs have important influences on reservoir parameters, especially permeability. In order to explore the influence of lamina density and occurrence on the permeability of lamellar shale after hydration, we studied the lamellar shale in the Chang 7 member of the Yanchang Formation of Triassic in Ordos Basin. By comparing the permeability of bedding shale and lamellar shale with different densities of laminae, it was found that the permeability anisotropy of lamellar shale was stronger. In the direction parallel to the lamina, the permeability increased approximately linearly with an increase in lamina density. The effect of hydration on rock micropore structure and permeability was studied by soaking shale in different fluids. Most of the microfracture in the lamellar shale was parallel to the lamina direction, and hydration led to a widening of the microfracture, which led to the most obvious increase in permeability parallel to the lamina. Collectively, the research results proved that lamina density, occurrence, and hydration have a significant influence on the permeability anisotropy of lamellar shale.

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Experimental investigation on the influence of sub- and super-critical CO2 saturation time on the permeability of fractured shale

Cited by 59 publications

References 70 publications

Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures

Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures

Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

The Influence of Lamina Density and Occurrence on the Permeability of Lamellar Shale after Hydration

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