A new shape design method of salt cavern used as underground gas storage

A new model used to design the shape and dimension of salt cavern gas storage is proposed in the paper. In the new model, the cavern is divided into two parts, namely the lower and upper structures, to design. The concepts of slope instability and pressure arch are introduced into the shape design of the lower and upper structures respectively. Calculating models are established according to the concepts. Field salt cavern gas storage in China is simulated as examples, and its shape and dimension are proposed. The effects of gas pressure, friction angle and cohesion of rock salt on the cavern stability are discussed. Moreover, the volume convergence, displacement, plastic volume rate, safety factor, and effective strain are compared with that of three other existing shapes salt caverns to validate the performance of newly proposed cavern. The results show that the max. gas pressure determines the shape and dimension of cavern lower structure, while the min. gas pressure decides that of cavern upper structure. With the increase of friction angle and cohesion of rock salt, the stability of salt cavern is increased. The newly proposed salt cavern gas storage has more notable advantages than the existing shapes of salt cavern in volume convergence, displacement, plastic volume rate, safety factor, and effective strain under the same conditions.

[1]  John K. Warren,et al.  Evaporites : sediments, resources and hydrocarbons , 2006 .

[2]  J. Neal,et al.  Strategic Petroleum Reserve (SPR) additional geologic site characterization studies, Bayou Choctaw salt dome, Louisiana , 1993 .

[3]  J. Slizowski,et al.  Salt-mudstones and rock-salt suitabilities for radioactive-waste storage systems: rheological properties , 2003 .

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

[5]  Pierre Berest,et al.  Transient behavior of salt caverns : Interpretation of mechanical integrity tests , 2007 .

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

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

[8]  K.-H. Lux,et al.  Design of salt caverns for the storage of natural gas, crude oil and compressed air: Geomechanical aspects of construction, operation and abandonment , 2009 .

[9]  Hamed Ardalan,et al.  Analysis of pile stabilized slopes based on soil–pile interaction , 2012 .

[10]  Daniel Castro-Fresno,et al.  Review of seasonal heat storage in large basins: Water tanks and gravel–water pits , 2010 .

[11]  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 .

[12]  Zhao Lian-heng,et al.  Improved Sliding Surface Search Method for Stability Analysis of Complex Slopes , 2012 .

[13]  M. A. Bradford,et al.  Elastic flexural-torsional instability of structural arches under hydrostatic pressure , 2008 .

[14]  L. C. D. Silva,et al.  Numerical modeling of the pressure arch in underground mines , 1998 .

[15]  Yang Henglin.  Improved Mohr-Coulomb criterion applicable to gas storage caverns in multi-laminated salt stratum , 2010 .

[16]  L Yu,et al.  A hybrid method for quasi-three-dimensional slope stability analysis in a municipal solid waste landfill. , 2011, Waste management.

[17]  P. Bérest,et al.  Influence of the leaching phase on the mechanical behavior of salt caverns , 1997 .

[18]  Yang Chunhe.  STUDY OF OPTIMIZATION OF DESIGN PARAMETERS FOR UNDERGROUND GAS STORAGE IN SALT ROCK , 2011 .

[19]  Pierre Berest,et al.  Review of static and dynamic compressibility issues relating to deep underground salt caverns , 1999 .

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

[21]  Yang Xiu-juan.  Stability analysis of pillars between bedded salt cavern gas storages , 2011 .

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

[23]  Brett Poulsen,et al.  Coal pillar load calculation by pressure arch theory and near field extraction ratio , 2010 .

[24]  H. Alkan,et al.  Percolation model for dilatancy-induced permeability of the excavation damaged zone in rock salt , 2009 .

[25]  C. Chunlin Li,et al.  Rock support design based on the concept of pressure arch , 2006 .

[26]  N. Cristescu,et al.  The optimal shape of rectangular-like caverns , 1995 .

[27]  María D. Bovea,et al.  Safety factor nomograms for homogeneous earth dams less than ten meters high , 2009 .

[28]  Hong Zheng,et al.  On two definitions of the factor of safety commonly used in the finite element slope stability analysis , 2006 .

[29]  K. Staudtmeister,et al.  Rock mechanical design of storage caverns for natural gas in rock salt mass , 1997 .

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

[31]  Stefan Heusermann,et al.  Nonlinear finite-element analysis of solution mined storage caverns in rock salt using the LUBBY2 constitutive model , 2003 .

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