Analysis of pressure interval/injection and production frequency on stability of large-scale supercritical CO2 storage in salt caverns

Liu, Wei; Duan, Xingyu; Li, Qihang; Wan, Jifang; Zhang, Xiong; Fang, Juan; Jiang, Deyi; Chen, Jie

doi:10.1016/j.jclepro.2023.139731

Cited by 20 publications

(3 citation statements)

References 39 publications

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“…The pore water pressure before the open-pit mining stage was negative, indicating that it was unsaturated soil and mainly had matrix suction. With the process of rainfall, the values of all monitoring points slowly increased and turned positive and mainly had pressure, and the internal particles changed from an inward infiltration state to a free seepage state for water molecules [52][53][54]. The pore water pressure of each monitoring point changed from negative to positive in the later stage of growth and tended to become stable in about 30 min.…”

Section: Variation Characteristics Of Pore Water Pressurementioning

confidence: 99%

Rainfall–Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

Li,

Wang,

et al. 2024

Water

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This research examines how rainfall and mining affect the slope damage resulting from the transition from open-pit mining to underground mining. Using an unmanned aerial vehicle (UAV), the Huangniu slope of the Dexing Copper Mine was fully characterized, and experiments were conducted on rock samples from appropriate sites. First, the mechanical properties of the samples were measured. Then, the parameters of the similarity simulation experiments were derived based on the similarity theory. Subsequently, the rainfall, rock slope, data acquisition, and monitoring systems were designed. Finally, the rock mass failure with different slope angles was analyzed, and the deformation and damage patterns under the coupling effect were obtained. The results show that rainfall increases pore water pressure and moisture content. Rainfall and slope-slip water have more of an impact on the open-pit platform. The pore water pressure values on the upper rock mass rise faster than inside it. In the open-pit mining stage, the rock mass shifts slightly to the upper left. In the room mining stage, vertical fractures and goaf sinking occur. The fractures above the mine form a semi-ellipse. In the pillar mining stage, overlying rock displacement is evident and fractures persist. In the continuous pillar mining stage, the overlying rock collapses. The 65° slope model was the most damaged, while the 55° slope model was the least damaged. The results also suggest that the UAV guides sample selection.

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Section: Variation Characteristics Of Pore Water Pressurementioning

confidence: 99%

Rainfall–Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

Li,

Wang,

et al. 2024

Water

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“…FLAC3D software is used to simulate the stability of the horizontal cavern when different portion rates of the sediments are used for gas storage (Walsh et al, 2018;Zabolotnii et al, 2022). Moreover, the main indexes to characterize the long-term stability of the gas storage salt cavern are the volume shrinkage rate of the cavern, the volume and distribution range of plastic zones in surrounding rocks, and the displacement of key positions, such as the cavern roof or cavern waist (Liu et al, 2023b;Liu et al, 2024).…”

Section: Simulation Modelmentioning

confidence: 99%

Feasibility assessment of solution mining and gas storage in salt caverns: a case study of the Sanshui salt mine

Yi,

Li,

Zhao

et al. 2023

Front. Energy Res.

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The Sanshui salt mine is the sole location in the Guangdong province of South China with the potential to construct a salt cavern gas storage (SCGS) facility. Nevertheless, the gas storage construction of this mine faces significant challenges due to the presence of low‒grade salt deposits and numerous interlayers. To demonstrate the feasibility and calculate the gas storage capacity in this specific mining area, two representative salt caverns within this salt mine were simulated using a self-developed cavern-building simulation program, enabling us to accurately determine their respective volumes and shapes. Herein, the findings indicate that the combined caverns possess a total mining space volume of 1,157,000 m3, with the brine space accounting for merely 291,800 m3 (representing 25.22% of the overall mining space), and an extensive sedimentary volume of 865,200 m3 is also observed (constituting approximately 74.78% of the total mining capacity). Fortunately, this study has revealed that the sediments exhibit a porosity exceeding 40% and possess favorable permeability; consequently, countermeasures have been proposed to enhance the gas storage capacity within the pore space of these caverns, and we also utilized FLAC3D software for numerical simulation calculations to compare the stability of the cavern under different conditions of sediment pore utilization by calculating the volume loss rate, cavern wall displacement deformation, and plastic zone distribution. Moreover, the proposed method is anticipated to double the caverns’ working gas volume, increasing it from 40 million m3 to nearly 80 million m3. On the other hand, the long-term stability of caverns is numerically assessed under different pore space utilization rates of the sediments. The results also indicate that the caverns’ volume shrinkage, plastic zones, and surrounding rock displacement remain within allowable limits during 30 years of gas storage operation. The primary problem in the subsequent phase lies in effectively achieving gas injection and brine removal from the pore space of sediments while devising a methodology to extend this method to other salt caverns within similar salt mine areas. Thus, this study provides theoretical and technical guidance for the establishment of gas storage in existing salt caverns in the Sanshui salt mine and in salt mines worldwide that share similar geological conditions.

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“…As the duration of mining activities extends, the frequency of extensive surface subsidence incidents has increased [5][6][7]. Research into the mechanisms behind surface subsidence in salt mining areas has yielded insightful conclusions [8][9][10][11]. The extraction of salt rock results in the gradual enlargement of underground dissolution cavities, occasionally evolving into a network of interconnected cavities across wells.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Mechanism of Land Subsidence Due to Water Network Integration at the Guangzhou Longgui Salt Mine and Its Impact on Adjacent Subway

Zhang,

Liu,

Zhang

et al. 2024

Water

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Water-soluble mining was invariably associated with surface subsidence, which in some cases escalated to the movement, deformation, and even collapse of the overlying rock layers, triggering grave subsidence calamities. The caprock of the salt-bearing strata in the Longgui salt rock mining area was closely adjacent to the third aquifer, which mainly consisted of fractured, porous, high-permeability materials such as mudstone conglomerates, rendering the geological conditions highly complex. Years of water-soluble mining had led to significant surface subsidence in the mining area, with a trend toward accelerated subsidence. In this study, the geological conditions of the Longgui salt rock mining area were analyzed, and through simulated experiments of pillar dissolution mining, the mechanisms of surface subsidence in the area were examined. Over time, the dissolution gradually perforated the pillars and caprock, with the pillars ceasing to support the caprock, ultimately transforming small cavities into a large single cavity. Utilizing subsidence data, this research employed numerical simulation to inverse and predict subsidence patterns from 2019 to 2025, revealing that the maximum subsidence reached 1367.6 mm in mining area I and 1879.5 mm in mining area II, with subsidence rates of 12.05 mm/y and 44.78 mm/y, respectively. Moreover, the impact of ground subsidence on the construction of adjacent subways was assessed by establishing monitoring points and evaluating subsidence along subway cross-sections and longitudinal directions. The findings provided valuable insights for guiding the prevention and control of surface subsidence calamities in the Longgui salt rock mine and similar mining areas in Guangzhou, China.

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Analysis of pressure interval/injection and production frequency on stability of large-scale supercritical CO2 storage in salt caverns

Cited by 20 publications

References 39 publications

Rainfall–Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

Rainfall–Mining Coupling Effects on Slope Failure Mechanism and Evolution Process: A Case Study of Open-Pit to Underground Mining

Feasibility assessment of solution mining and gas storage in salt caverns: a case study of the Sanshui salt mine

Investigating the Mechanism of Land Subsidence Due to Water Network Integration at the Guangzhou Longgui Salt Mine and Its Impact on Adjacent Subway

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