Feasibility analysis of using abandoned salt caverns for large-scale underground energy storage in China

Rock salt in China is primarily bedded salt, usually composed of many thin salt layers and interlayers (e.g. anhydrite, mudstone, and glauberite). Thus, the feasibility analysis of abandoned salt caverns located in salt beds to be used as Underground Gas Storage (UGS) facilities is full of challenges. In this paper, we introduce the feasibility analysis of China’s first salt cavern gas storage facility using an abandoned salt cavern. The cavern is located in Jintan city, Jiangsu province, China. The mechanical properties and permeability of the bedded salts are obtained by experiments. Based on the results of the analyses, it appears to be quite feasible to convert the abandoned salt caverns of Jintan city to UGS facilities. The stability of the cavern is evaluated by the 3D geomechanical numerical simulations, and the operating parameters are proposed accordingly. Results indicate that the maximum volume shrinkage of the cavern is less than 25% and the maximum deformations are less than 2% of the caverns’ maximum diameters after operating for 20years. It is recommended that the weighted average internal gas pressure be maintained as 11MPa to control the extent of the plastic zones to a safe level. Safety factors decrease with operating time, especially those of the interface between rock salt and mudstone layers decrease significantly. Effective strain is generally greater than 2%, and locally is greater than 3% after operating 20years. The maximum pressure drop rate should be kept to less than 0.55MPa/day. Based on above proposed parameters, China’s first salt cavern gas storage facilities were completed, and gas was first injected, in 2007. To check the status of the caverns after operating for 6years, the volumes of the caverns were measured in 2013 by Sonar under working conditions. Measurement results show that the cavern shapes did not change much, and that volume shrinkages were less than 2%. Comprehensive results show that the feasibility analysis method proposed in this paper is reliable.

[1]  Yildiray Cinar,et al.  CO2 Storage in Abandoned Coal Mines , 2011 .

[2]  Chunrong,et al.  China＇s Oil and Gas Imports and Exports in 2012 , 2013 .

[3]  Jianhua Yin,et al.  Experimental investigation of creep behavior of salt rock , 1999 .

[4]  Joe L. Ratigan,et al.  Dilatancy of rock salt in laboratory tests , 1993 .

[5]  R. A. Chadwick,et al.  Underground gas storage : worldwide experiences and future development in the UK and Europe , 2009 .

[6]  J. L. Ratigan,et al.  A note on the use of precision level surveys to determine subsidence rates , 1991 .

[7]  Chunhe Yang,et al.  Mechanical properties of Jintan mine rock salt under complex stress paths , 2012 .

[8]  Siddhartha Kumar Khaitan,et al.  Modeling and simulation of compressed air storage in caverns: A case study of the Huntorf plant , 2012 .

[9]  Chao Du,et al.  Analysis of major risks associated with hydrocarbon storage caverns in bedded salt rock , 2013, Reliab. Eng. Syst. Saf..

[10]  S. R. Bodner,et al.  A Damage Mechanics Treatment of Creep Failure in Rock Salt , 1997 .

[11]  A. Özarslan.  Large-scale hydrogen energy storage in salt caverns , 2012 .

[12]  Wei Liu,et al.  Experimental investigation of mechanical behavior of bedded rock salt containing inclined interlayer , 2014 .

[13]  Yang Chunhe.  INVESTIGATIONS ON EVALUATING CRITERIA OF STABILITIES FOR ENERGY (PETROLEUM AND NATURAL GAS) STORAGE CAVERNS IN ROCK SALT , 2005 .

[14]  Jonny Rutqvist,et al.  Exploring the concept of compressed air energy storage (CAES) in lined rock caverns at shallow depth: A modeling study of air tightness and energy balance , 2012 .

[15]  Tongtao Wang,et al.  A new shape design method of salt cavern used as underground gas storage , 2013 .

[16]  C A Coulomb,et al.  ESSAI SUR UNE APPLICATION DES REGLES DE MAXIMIS ET MINIMIS A QUELQUES PROBLEMES DE STATIQUE RELATIFS A L'ARCHITECTURE (ESSAY ON MAXIMUMS AND MINIMUMS OF RULES TO SOME STATIC PROBLEMS RELATING TO ARCHITECTURE) , 1973 .

[17]  Yinping Li,et al.  On fracture saturation in layered rocks , 2007 .

[18]  Xiujuan Yang,et al.  Stability analysis of the pillars between bedded salt cavern gas storages by cusp catastrophe model , 2011 .

[19]  Tongtao Wang,et al.  Roof Stability Evaluation of Bedded Rock Salt Cavern Used as Underground Gas Storage , 2012 .

[20]  S. Atluri,et al.  A study of two finite strain plasticity models: An internal time theory using Mandel's director concept, and a general isotropic/kinematic-hardening theory , 1987 .

[21]  L. W. Brown.  Abandoned coal mine stores gas for Colorado peak-day demands , 1978 .

[22]  Byoung Yoon Park,et al.  Allowable pillar to diameter ratio for strategic petroleum reserve caverns. , 2011 .

[23]  J. Daemen,et al.  A new Cosserat‐like constitutive model for bedded salt rocks , 2009 .

[24]  G. Baiocchi,et al.  Modeling of financial incentives for investments in energy storage systems that promote the large-scale integration of wind energy , 2013 .