摘要
利用深部盐岩洞穴进行天然气储备是目前国际上广泛采用的一种方法。为研究注采气交变气压、气压变化速率对储气库运行安全的影响,设计研制出三维梯度非均匀加载地质力学模型试验系统、注采气智能控制系统以及基本满足相似条件且具有显著流变特性的层状盐岩模型相似材料。通过江苏金坛盐岩地下储气库注采气大型三维地质力学模型试验,有效获得交变气压、气压变化速率等风险因素对储库运营安全稳定的影响。试验结果表明:采气降压和注采气压变化速率是影响盐腔运营安全的重要因素,洞腔径向收敛位移和径向应变随储气内压的减小逐渐增大,为保证储库运行安全,储库储气内压应大于4MPa。注采气压变化速率越快,洞腔径向收敛位移和径向应变变化速率越大,因此,应有效控制储气库的注采气压变化速率。研究成果为储库运营安全控制提供可靠的试验依据。
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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第12期2410-2419,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2009CB724607)
国家自然科学基金资助项目(40772173)
教育部新世纪优秀人才支持计划资助(NCET-08-0336)
关键词
岩石力学
层状盐岩
交变气压
气压变化速率
流变相似材料
大型地质力学模型试验
rock mechanics
bedded salt rock
alternating gas pressure
gas pressure changing rate
similar material for rheology
large scale geomechanical model test
