Quantitative investigation on the stability of salt cavity gas storage with multiple interlayers above the cavity roof

2021 ◽  
Vol 44 ◽  
pp. 103298
Author(s):  
Depeng Li ◽  
Wei Liu ◽  
Deyi Jiang ◽  
Jie Chen ◽  
Jinyang Fan ◽  
...  
Keyword(s):  
Gas Storage ◽  
Quantitative Investigation ◽  
The Stability

scholarly journals Numerical Investigation on Shape Optimization of Small-Spacing Twin-Well for Salt Cavern Gas Storage in Ultra-Deep Formation

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2859
Author(s):  
Haitao Li ◽  
Jingen Deng ◽  
Qiqi Wanyan ◽  
Yongcun Feng ◽  
Arnaud Regis Kamgue Lenwoue ◽  
...  
Keyword(s):  
Safety Evaluation ◽  
Gas Storage ◽  
Gas Pressure ◽  
Salt Cavern ◽  
Well Spacing ◽  
3D Geomechanical Model ◽  
The Stability ◽  
Bedded Rock Salt ◽  
Salt Cavern Gas Storage ◽  
Small Spacing

Small-spacing twin-well (SSTW) salt caverns have an extensive application prospect in thin or bedded rock salt formations due to their good performance, while they are rarely used in ultra-deep formations. The target strata depth of Pingdingshan salt mine is over 1700 m, and it is planned to apply an SSTW cavern to construct the underground gas storage (UGS). A 3D geomechanical model considering the viscoelastic plasticity of the rock mass is introduced into Flac3D to numerically study the influence of internal gas pressure, cavern upper shape and well spacing on the stability of an SSTW salt cavern for Pingdingshan UGS. A set of assessment indices is summarized for the stability of gas storage. The results show that the minimum internal gas pressure is no less than 14 MPa, and the cavern should not be operated under constant low gas pressure for a long time. The cavern with an upper height of 70 m is recommended for Pingdingshan gas storage based on the safety evaluation and maximum volume. The well spacing has a limited influence on the stability of the salt cavern in view of the volume shrinkage and safety factor. Among the values of 10 m, 20 m and 30 m, the well spacing of 20 m is recommended for Pingdingshan gas storage. In addition, when the cavern groups are constructed, the pillar width on the short axis should be larger than that on the long axis due to its greater deformation in this direction. This study provides a design reference for the construction of salt cavern gas storage in ultra-deep formations with the technology of SSTW.

scholarly journals Theoretical Analytical Solution of Deformation and Stress Distribution of Underground Gas Storage Cavern in Bedded Salt Rock

2018 ◽  
Vol 64 (4) ◽  
pp. 37-53
Author(s):  
P. Xie ◽  
H.J. Wen ◽  
G.J. Wang ◽  
J. Hu
Keyword(s):  
Numerical Simulation ◽  
General Solution ◽  
Gas Storage ◽  
Displacement Function ◽  
Inverse Laplace Transform ◽  
Salt Rock ◽  
Underground Gas Storage ◽  
Simulation Results ◽  
Stress And Deformation ◽  
The Stability

Abstract The main purpose of the study is to investigate the mechanical properties around an underground gas storage cavern in bedded salt rock. Firstly, considering the characteristics of the salt rock formation in China, the mechanical model was simplified into a hollow cylinder, which containing non-salt interlayer. In terms of elastic theory, Love displacement function was developed, and the elastic general solution of stress and deformation components were obtained after determining the undetermined coefficients. Under the same condition, numerical simulation was carried out. The validity of the elastic general solution is verified by comparing to numerical simulation results. Furthermore, Based on the feasible general elastic solution, viscoelastic solution was obtained through Laplace transformation and inverse Laplace transform, which could provide reference for the study on the stability and tightness of underground gas storage carven during operation to some extent.

scholarly journals Critical Length and Collapse of Interlayer in Rock Salt Natural Gas Storage

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Yingjie Wang ◽  
Jianjun Liu
Keyword(s):  
Mathematical Model ◽  
Rock Salt ◽  
Critical Length ◽  
Gas Storage ◽  
Mechanical Instability ◽  
Calculation Results ◽  
The Stability ◽  
Salt Cavern Gas Storage ◽  
The Mathematical Model ◽  
Physical And Mechanical Characteristics

The existence of an interlayer has a significant effect on the stability of a rock salt gas storage cavity; therefore, an uncontrollable collapse of the interlayer would cause a series of issues. In this study, three types of mechanical instability criteria are comprehensively calculated. The limit radius of the interlayer is computed under different criteria, and the collapse radius of the interlayer is obtained by comparison. The calculation results of the mathematical model are highly accurate with respect to actual engineering logging data, in general with over 90% of accuracy. It is demonstrated that, besides the physical and mechanical characteristics of the sandwich, the location of the interlayer in the cavity and concentration of the brine also have an important effect on the collapse of the interlayer. The brine at the bottom of the cavity is nearly saturated. Therefore, an interlayer at this location does not easily collapse. The mathematical model established in this study is used in the seismic design and prediction of interlayer collapse during the construction of salt-cavern gas storage facilities in China.

In situ real-time and quantitative investigation on the stability of non-aqueous lithium oxygen battery electrolytes

2016 ◽  
Vol 4 (17) ◽  
pp. 6332-6341 ◽  
Author(s):  
Dong Wook Kim ◽  
Su Mi Ahn ◽  
Jungwon Kang ◽  
Jungdon Suk ◽  
Hwan Kyu Kim ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Real Time ◽  
Dimethyl Ether ◽  
Tetraethylene Glycol ◽  
Quantitative Investigation ◽  
Glycol Dimethyl Ether ◽  
Differential Electrochemical Mass Spectrometry ◽  
Lithium Oxygen Battery ◽  
The Stability

Differential electrochemical mass spectrometry (DEMS) results clearly show that dimethylacetamide (DMA) is more stable and exhibits better performance than tetraethylene glycol dimethyl ether (TEGDME), suggesting that DMA is a more favorable electrolyte for Li–O2 battery applications.

Studies of Hard Interlayer’s Influence on the Creep Deformation of Salt Rock Cavity

2012 ◽  
Vol 594-597 ◽  
pp. 452-455 ◽  
Author(s):  
Xiao Lan Huang ◽  
Chao Yu
Keyword(s):  
Mechanical Properties ◽  
Great Influence ◽  
Gas Storage ◽  
Calculation Model ◽  
Radial Deformation ◽  
Salt Mine ◽  
Salt Rock ◽  
Modeling Analysis ◽  
The Stability ◽  
Oil Gas

The existence of interlayers has great influence on the stability of salt cavern. Based on the research results of creep test and other mechanical properties of salt rock and interlayer in Yunying Salt Mine, Hubei Province, cylindrical singular calculation model of salt rock cavity is built, and the corresponding simulation is conducted. Hard interlayer’s constraint influence on the creep contraction deformation of salt cavity is demonstrated. In addition, how the number of interlayers affects cavity radial deformation is discussed too. The results are important to oil-gas storage cavern modeling analysis in laminated salt rock.

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