Experimental and mechanistic study of mudstone volumetric swelling at the bottom of salt cavern gas storage

Yao, Erdong; Xu, Huimin; Zhang, Kun; Liu, Shuang; Sheng, Lianqi; Li, Bojun; Bai, Hao; Zhou, Fujian

doi:10.1016/j.arabjc.2022.104082

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…Different mineral compositions can result in a difference of 6-23% in the VVISs, as illustrated in Figure 7. Under the same particle size, the internal void volume of minerals such as quartz, albite, and illite is relatively large; mineral components such as anhydrite are prone to water absorption and expansion [34][35]. They decompose into small particles or mix with water to form mud-like deposits at the bottom or adhere to the surface of rock particles, which is not conducive to the expulsion of void water; therefore, the VVISs is also low.…”

Section: Resultsmentioning

confidence: 99%

Research on the Influencing Factors of the Void Volume of Insoluble Sediment in Salt Cavern Gas Storage

Sun,

Ding,

et al. 2024

Processes

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Utilizing voids of insoluble sediment (IS) to store gas is an effective way to improve the efficiency of salt cavern gas storage (SCGS) in China. In this study, a suitable method for predicting the void volume of insoluble sediments (VVISs) is established. This study explores three key factors affecting the VVISs through laboratory experiments. Firstly, in order to make the experimental results more in line with production realities, an analysis of the characteristics of IS in X SCGS was conducted to provide a basis for setting parameters for subsequent experiments. Secondly, experimental setups and methods for measuring the VVISs were designed. Finally, the experimental results were used to predict the VVISs in on-site cavity wells. The results indicate that the higher the proportion of quartz, illite, and large-grain particles in IS, the larger the VVISs. Under different parameters, the VVISs can account for approximately 10–40% of the IS accumulation volume. Different particle sizes can cause a variation of approximately 5–30% in the VVISs, while different mineral compositions can result in a difference of 6–23% in the VVISs. With increasing compaction pressure, the VVISs can decrease by around 5–80%. The prediction of the VVISs in on-site cavity wells shows a high degree of fit with empirical algorithms. This study can provide a reference basis for the utilization of the void space of IS in SCGS.

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Section: Resultsmentioning

confidence: 99%

Research on the Influencing Factors of the Void Volume of Insoluble Sediment in Salt Cavern Gas Storage

Sun,

Ding,

et al. 2024

Processes

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“…We then dropped different shrinkage agents or distilled water into the three-port flask at a constant flow rate of 0.2 mL/min and recorded the volume of the remaining solid every time for 168 h. In the range where the difference between the results was less than 5%, all the results were taken as the arithmetic average of the two groups. The calculation formula of the shrinkage rate is [19]:…”

Section: Establish a Shrinkage Agent Evaluation Methodsmentioning

confidence: 99%

Study and Mechanism Analysis on Dynamic Shrinkage of Bottom Sediments in Salt Cavern Gas Storage

Zhang

Deng

et al. 2022

Processes

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Underground salt cavern gas storage is the best choice for the production peak adjustment and storage of natural gas, and is a basic means to ensure the safe supply of natural gas. However, in the process of these caverns dissolving due to water injection, argillaceous insoluble sediments in the salt layer will fall to the bottom of the cavity and expand, occupying a large amount of the storage capacity and resulting in the reduction of the actual gas storage space. Effectively reducing the volume of sediments at the bottom of the cavity is a potential way to expand the storage capacity of the cavity. In this study, a method to reduce the volume of argillaceous insoluble sediments with particle sizes ranging from 10 mesh to 140 mesh, via a chemical shrinkage agent, has been proposed. Firstly, the inorganic polymer shrinkage agent PAC30 was synthesized, and then a set of dynamic shrinkage evaluation methods was established to evaluate the influence of temperature, particle size, concentration, and other factors on the shrinkage performance. Finally, by means of a scanning electron microscope (SEM), the Zeta potential, and static adsorption experiments, the mechanism of the interaction between PAC30 and cavity-bottom sediments was described and verified in detail. The experimental results show that the optimal concentration of PAC30 for dynamic shrinkage is 20 ppm. The shrinkage performance of PAC30 decreases with an increase in temperature, and the smaller the particle size of the insoluble sediments, the worse the shrinkage performance. According to the adsorption experiment and Zeta potential, PAC30 can be effectively adsorbed on the surface of insoluble sediments, and the SEM images show that, after adding PAC30, the particles are tightly packed, and the volume of insoluble sediments is significantly reduced. In the large-scale model experiment, the expansion rate of PAC30 reached 20%, which proves that the shrinkage agent is a potential method to expand the gas storage volume.

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“…Even after centrifugation removes part of the free water, the clay absorbs a lot of water (Tang et al, 2020), resulting in the low mechanical strength of siltstone and one of the reasons for the small decrease in water content during centrifugation. Upon absorbing water, clay minerals expand their lattice (Yao et al, 2022), compressing the pore space and clogging micropores, making it harder for water to escape. Water affects the mechanical properties of rocks by softening minerals, it has less effect on granular skeleton minerals such as quartz, feldspar and mica, while the effect on the fillings of clay and calcareous cementation is strong (Yasidu et al, 2017).…”

Section: Figurementioning

confidence: 99%

Damage degradation law of mechanical properties of sandstone under different water-rich states

He,

Hu,

et al. 2024

Front. Earth Sci.

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Safety is the primary guarantee for achieving coal mine production. The degree of water in the overlying rock of the coal seam has a significant impact on the mechanical strength of the rock, which can lead to subsidence, roof collapse, and rock burst in the mining area. Therefore, it is important to study the law of water-rich damage and deterioration of coal seam overlying rock, as well as the characteristics of bursting liability to prevent and control mining disasters. This paper aims to investigate the change in compressive strength, elastic modulus, and bursting liability of coal measure strata under different water content and their relationship with lithology, particle size, pore characteristics, and mineral characteristics. We carried out uniaxial compression tests on drilled and prepared samples of coal measure strata in the east of Ordos City. We also monitored the acoustic emission characteristics of the rock failure process under different water content. The results demonstrate that, in the dry state, the compressive strength of siltstone >fine sandstone >medium sandstone >coarse sandstone. As the water content increases, the rock transitions from brittle to plastic, and the compressive strength, elastic modulus, and bursting liability gradually decrease. The stress-strain curve changes from a single peak to bimodal and multimodal, and the active degree of acoustic emission events decreases, especially the low-value ringing count. Calcareous cementation, clay minerals, and chlorite exhibit strong softening properties when subjected to water, while the grain skeleton (comprising quartz, feldspar, mica) and siliceous cementation displays weak softening properties in such conditions. The most significant is the mechanical strength deterioration of siltstone containing a clay matrix. The research findings can provide reference and theoretical support for safe mining practices in coal mines.

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Experimental and mechanistic study of mudstone volumetric swelling at the bottom of salt cavern gas storage

Cited by 5 publications

References 38 publications

Research on the Influencing Factors of the Void Volume of Insoluble Sediment in Salt Cavern Gas Storage

Research on the Influencing Factors of the Void Volume of Insoluble Sediment in Salt Cavern Gas Storage

Study and Mechanism Analysis on Dynamic Shrinkage of Bottom Sediments in Salt Cavern Gas Storage

Damage degradation law of mechanical properties of sandstone under different water-rich states

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