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Abstract Utilizing the deep salt rock caverns to store the natural gas is the widely adopted method internationally. In order to study the influence of alternating pressure of gas injection and extraction and the gas pressure changing rate on the operation safety of storage，the three-dimensional gradient non-uniform loading geomechanical model test system，the gas injection and extraction intelligent control system and the bedded salt rock similitude material which is of significant rheological property are developed. Through the large scale three-dimensional geomechanical model test of gas injection and extraction for Jintan gas storage in Jiangsu province，the influence of risk factor such as the alternating gas pressure and the gas pressure changing rate on the operation safety of the storage have been got effectively. The test results show that the gas extraction-induced pressure release and the gas pressure changing rate are the important factors which affect the operation safety of the salt rock cavern；and the radial convergence displacement and radial strain increase gradually with the decreasing of the inner pressure of the cavern. The inner pressure value during the storage operation should be greater than 4MPa in order to ensure the operation safety of the cavern. The changing rate of radial displacement and radial strain surrounding the cavern get more rapid with the increasing of the gas injection and extraction changing rate. So，in order to ensure the operation safety of the cavern，the gas pressure changing rate of storage should be controlled effectively. The results of test research provide the reliable experimental evidence for the operation safety controlling of storage.
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Received: 01 July 2010
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2010, Vol. 29 
