Impact of effective stress on permeability for carbonate fractured-vuggy rocks

Sun, Ke; Liu, Huiqing; Leung, Juliana Y.; Wang, Jing; Feng, Yabin; Liu, Renjie; Kang, Zhijiang; Zhang, Yun

doi:10.1016/j.jrmge.2023.04.007

Cited by 2 publications

(2 citation statements)

References 41 publications

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“…In order to replicate the reservoir characteristics, physical experiments on carbonate reservoir cores often resort to artificial fracturing methods to imitate the desired features [16]. However, commonly employed pressurization fracturing methods fail to accurately represent the complex structure of the actual fractured-vuggy system found in carbonate reservoirs.…”

Section: Fractured Vuggy Core Samples and Engravingmentioning

confidence: 99%

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Wang,

et al. 2024

Energies

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Global demand for underground gas storage (UGS) is steadily increasing, with the limestone-based UGS system situated in the Sichuan Basin of China gathering considerable interest in recent years. However, studies focusing on the fundamental mechanisms of the injection-production process in these systems are limited. Moreover, existing studies utilizing physical experimental methods frequently fall short in effectively visualizing micro-flow or incorporating real core samples from the reservoir. To address these gaps, we performed a coreflood experiment, integrating micro-Computed Tomography (CT) scanning to investigate mechanisms of fluid flow and storage capacity during the injection and production cycles in limestone reservoirs. Our approach involved utilizing core plugs with artificially engraved fracture-vuggy structures, which mimic the characteristics of the reservoir. Micro-CT scans were performed to visualize the microscopic changes in fractured-vuggy structures and the distribution of irreducible water during each cycle. This study reveals that increased cycles correspondingly affect gas storage capacity, particularly by expanding it in relative larger vuggy structures while reducing it in finer fissure network structures. The amount of irreducible water decreases after injection-production cycles, likely being expelled alongside the extracted dry gas. This plays a critical role in expanding the storage capacity in larger vuggy systems. Conversely, there is a decrease in storage capacity within fissure network systems, as the irreducible water is replaced by gas. This leads to a reduction in the opening force of the fine conduit. The dense matrix has a very limited effect on the flow mechanism and its influence on storage capacity. Overall, these findings offer practical insights for optimizing injection and production strategies in limestone UGS systems within the Sichuan Basin, contributing to a deeper understanding and efficient utilization of this vital infrastructure.

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Section: Fractured Vuggy Core Samples and Engravingmentioning

confidence: 99%

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Wang,

et al. 2024

Energies

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“…However, due to the intricate nature of karst caves and fractures as well as their interconnections within fractured reservoirs, the field implementation of flow channel adjustments for different well conditions requires distinct process parameters [18]. This constraint hinders the widespread adoption and application of particle flow channel adjustment technology [19]. Notably, local jamming caused by flow control agent particles is a crucial factor influencing the effectiveness of flow control [20].…”

Section: Introductionmentioning

confidence: 99%

CFD−DEM Simulation of a Jamming Mechanism and Influencing Factors of a Fracture-Shrinking Model

Zhang,

Lu,

Zhang

et al. 2024

Processes

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Fractured-vuggy reservoirs are crucial for increasing unconventional oil storage and production, but the controlling mechanism of this dominant flow channel remains vague, and the jamming mechanism of modulator particles is unclear. This study explores the filling and jamming processes of particles in the fractures by conducting a computational fluid dynamics−discrete element method (CFD−DEM) coupled simulation, considering the variation of fracture width, fluid velocity, particle size, and concentration. Results suggest that four sealing modes are proposed: normal filling, local jamming, complete sealing, and sealing in the main fracture. The ratio of particle size to the main fracture width exerts the primary role, with the ratio having a range of 0.625 < D/W ≤ 0.77 revealing complete jamming. Furthermore, an optimal particle size for achieving stable sealing is observed when the particle size varies from 2 to 2.5 mm. A higher concentration of particles yields better results in the fracture-shrinking model. Conversely, a greater velocity worsens the sealing effect on fractures. This research can offer technical support for the large-scale dissemination of flow regulation technology.

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Impact of effective stress on permeability for carbonate fractured-vuggy rocks

Cited by 2 publications

References 41 publications

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

Experimental Investigation of Injection and Production Cycles for Limestone Reservoirs via Micro-CT: Implications for Underground Gas Storage

CFD−DEM Simulation of a Jamming Mechanism and Influencing Factors of a Fracture-Shrinking Model

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