Determination of the maximum allowable gas pressure for an underground gas storage salt cavern – A case study of Jintan, China

Wang, Tongtao; Jian-jun, LI; Jing, Gang; Zhang, Qingqing; Yang, Chunhe; Daemen, J.J.K.

doi:10.1016/j.jrmge.2018.10.004

Cited by 80 publications

(18 citation statements)

References 14 publications

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“…It is about 16.1 MPa (23 kPa/m) for this simulation. The initial in-situ stresses and their gradients in the rock salt formation are basically equal along three directions at any given depth (Wang et al, 2019). This is mainly because the good creep deformation of rock salt causes any differential tectonic stresses of the rock salt formation to be released completely during the diagenesis.…”

Section: Geomechanical Model and Boundary Conditionsmentioning

confidence: 99%

“…Rock salt has good plastic deformation, low permeability, self-healing and is soluble (Bayram and Bektasoglu, 2020;Chen et al, 2020;Wang et al, 2019). It is regarded as the most ideal host for geologic energy (gas, oil and compressed air) storage.…”

Section: Introductionmentioning

confidence: 99%

“…Due to its rapid injection and delivery capacity (Bayram and Bektasoglu, 2020;Wang et al, 2018b), salt cavern gas storage is usually used for the continuous gas supply under emergency, such as extreme weather, trunk pipeline accident, and facility maintenance. The capacity of the gas storage salt cavern is mainly determined by its volume, and maximum and minimum gas pressure (Ozarslan, 2012;Wang et al, 2019). Low minimum gas pressure means low volume of cushion gas and large amount of working gas under emergency.…”

Section: Introductionmentioning

confidence: 99%

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Minimum operating pressure for a gas storage salt cavern under an emergency: a case study of Jintan, China

Wang

An²,

Xu³

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Decreasing the gas pressure is one of the most effective methods to increase the working gas capacity of salt cavern Underground Gas Storages (UGS). In this paper, KING-1 and -2 caverns of Jintan salt cavern UGS, Jiangsu province, China, are studied as an example to investigate their responses under extremely low gas pressure. A 3D geomechanical model of the two caverns is built based on the geological features and rock properties of the host rock salt formation. Different operating conditions are simulated. Safety evaluation criteria for completion casing and caverns are proposed. Thresholds of the indicators consisting of the criteria are given to find the potential minimum gas pressure and the safe working duration of the two caverns. Calculation results indicate that axial strain (along the vertical direction) can perfectly reflect the effects of low gas pressure on the safety of completion casing. The indicators calculated based on the stresses have advantages compared to those based on deformation in assessing the safety of the salt cavern under such low gas pressure and short operating time conditions. The minimum gas pressure gradient of KING-1 and -2 caverns at the casing shoe can decrease from about 7 kPa/m to 5 kPa/m, viz., the minimum gas pressure can decrease from 7 MPa to 5 MPa. The maximum duration for 5 MPa is no more than 118 days. Taking KING-1 cavern as an example, the working gas volume can increase about 17.3%. Research results can provide references for Jintan salt cavern UGS coping with gas shortages.

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Section: Geomechanical Model and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Minimum operating pressure for a gas storage salt cavern under an emergency: a case study of Jintan, China

Wang

An²,

Xu³

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

Self Cite

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“…Compared with other storage media, salt rock has the advantages of low permeability, stable mechanical properties, excellent creep characteristics, and strong damage selfhealing ability. Meanwhile, since salt rock is easy to dissolve in water, the cavity construction by the solution mining method not only can utilize the salt rock comprehensively but also can abase investment costs and reduce environmental pollution [5][6][7]. erefore, the salt rock stratum is internationally considered as an ideal medium for underground storage of energy resources and disposal of radioactive waste.…”

Section: Introductionmentioning

confidence: 99%

Creep Properties and Constitutive Model of Salt Rock

Zhang

Song

Wang

et al. 2021

Advances in Civil Engineering

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Due to the advantages of low porosity, low permeability, high ductility, and excellent capacities for creep and damage self-healing, salt rock is internationally considered as the ideal medium for underground storage of energy and disposal of radioactive waste. As one of the most important mechanical properties of salt rock, creep properties are closely related to the long-term operation stability and safety of salt rock underground storage cavern. A comprehensive review on the creep properties and constitutive model of salt rock is put forward in this paper. The opinions and suggestions on the research priority and direction of salt rock's mechanical properties in the future are put forward: (1) permeability variation of salt rock under the coupling effect of temperature and stress; (2) damage mechanism and evolution process under the effect of creep-fatigue interaction and low frequency cyclic loading; (3) microdeformation mechanisms of salt rock and the relationship between microstructure variations and macrocreep behavior during creep process; (4) the establishment of the creep damage constitutive model with simple form, less parameters, easy application, and considering the damage self-healing ability of salt rock simultaneously.

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“…Among them, the elastic model is widely used to simulate caprock mechanics during CO 2 storage owing to its ease in carrying out multifield coupling calculations with a high degree of coupling [17,18]. Based on the elastic constitutive model, a large number of hydromechanical coupling geomechanical models have been developed to analyze the mechanical integrity of caprock during the processes of injection and production [19][20][21][22][23]. Current research shows that the mechanical integrity of caprock will be affected by many factors during these processes [24,25].…”

Section: Introductionmentioning

confidence: 99%

Coupled Large Scale Hydromechanical Modelling for Caprock Failure Risk Assessment of Gas Storage in Aquifer

et al. 2021

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The rapidly increasing demand for the consumption of natural gas has attracted the interests to store natural gas in aquifer reservoir. However, natural gas injected into the aquifer reservoir, which could cause ground surface deformation and mechanical integrity destruction of caprock. Taking the aquifer gas storage of S trap as the research object, according to the geological structure and hydrogeological information, a coupling large-scale hydromechanical model is established to evaluate the damage risk of the gas reservoir in S aquifer. The proposed methodology is based on the development of fluid-solid coupling and application of FEM. The different failure mechanisms of S aquifer gas storage caprock can be evaluated on the basis of the tensile failure criterion and Mohr-Coulomb shear failure criterion. To analyze the change of caprock in gas injection and production process more clearly, a reference model is defined as an ideal calculation condition to discuss the mechanical response, pore pressure variation, and surface deformation characteristics of the caprock during injection and production. On this basis, the second scheme of sensitivity analysis is defined. The pressure injection rate, reservoir parameters, in situ stress, and other factors are considered, respectively, and the influence of different input parameters on mechanical stability and surface deformation of caprock is analyzed. Finally, the mechanical stability is analyzed and combined the above two criteria to predict the upper limit injection pressure of S. Simulation results show that the permeability and in situ stress have a significant influence on ground surface deformation and mechanical integrity of caprock, but Young’s modulus and Poisson’s ratio can be ignored; the upper limit pressure coefficient of S is 1.908.

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Determination of the maximum allowable gas pressure for an underground gas storage salt cavern – A case study of Jintan, China

Cited by 80 publications

References 14 publications

Minimum operating pressure for a gas storage salt cavern under an emergency: a case study of Jintan, China

Minimum operating pressure for a gas storage salt cavern under an emergency: a case study of Jintan, China

Creep Properties and Constitutive Model of Salt Rock

Coupled Large Scale Hydromechanical Modelling for Caprock Failure Risk Assessment of Gas Storage in Aquifer

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