|
In recent years , the growing global energy crisis , the halite deposits more countries for national strategic energy underground storage . At present, more and more also in-depth study of the construction and use of rock salt mechanical properties and rock salt cavern gas storage in rock salt deposits built . Jiangsu Jintan Salt Mine and its gas storage projects as the basis , respectively, through the creep characteristics of experimental , numerical simulation and mathematical models to study the stability of bedded salt rock gas storage operation period , specific research work are as follows : ① China Academy of Sciences, Wuhan Institute of Rock and Soil Mechanics uniaxial and triaxial creep characteristics of experimental results analysis ; application experience , creep constitutive equation , based on the experimental data of the steady creep rate , application 1stOpt , optimization software fitting salt rocks containing the mudstone interbeds salt rocks and mudstone creep constitutive parameters , and draw a steady creep rate and the fitting surface . ( 2 ) based on geological conditions of the Jintan Salt Mine , FLAC3D program , three - dimensional numerical simulation study of the long-term rheology of the proposed gas storage , namely analog CAVERNS shape , operating pressure , mezzanine , the height of the casing shoe and caverns spacing on stability of gas storage operators . ( 3 ) consolidated domestic and foreign research results , summarize the underground gas storage in salt rock stability evaluation criteria ; using analytic hierarchy process to establish gas storage operations phase stability evaluation index system and determine the index weight , to establish indicators of scoring methods based on the numerical simulation structure trapezoidal distribution membership function to calculate the degree of membership , and the eventual establishment of the stability of salt rock gas storage operator fuzzy comprehensive evaluation model ; gray theory to establish GM (1,1) model and GM (1,1) model group , the GM (1,1 ) absolute error of the model groups as a Markov chain , the state is divided , and calculate the state transition probability matrix , and the eventual establishment of the salt rock gas storage volume convergence gray - Markov prediction model . ④ fuzzy comprehensive evaluation model of stability of the salt rock gas storage operators in Jintan, Jiangsu West 1 , West 2 gas storage stability evaluation of the operation period , the composite score were 79.41,79.62 stability rating are compared stable , but each index score is extremely uneven . The practical results of the evaluation , the evaluation model has a very high value of promotion .
|