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我国盐穴储库建库地质条件具有层状分布、含夹层多、埋藏深度差异大的特点,控制多夹层盐穴的造腔形态对盐穴储库的长期稳定性和安全运营至关重要。成功研制盐穴造腔模拟与形态控制试验装置,为在室内模拟、确定最优的盐穴造腔工艺和形态控制参数提供先进的试验手段。该装置根据相似原理设计、制造,由试验装置框架、多场耦合模拟系统、注采循环系统、注采动态参数测量控制系统和盐腔形态动态数据采集系统等组成,其中,试验装置框架为主体结构,采用模块化设计;多场耦合模拟系统可模拟地温和地应力;注采循环系统可模拟注采水和控制油垫;注采动态参数测量控制系统可实现内外管高度、探头高度和角度控制;盐腔形态动态数据采集系统能实现造腔过程可视化录像和形态实时测量。试验装置可进行多夹层盐岩在多场耦合条件下不同施工工艺和参数对盐穴造腔过程影响与形态发展可视化模拟。通过不同尺寸盐芯试件的造腔模拟试验,结合溶腔发展预测及注油估算程序,证明了该试验装置能较好地模拟多夹层盐穴造腔可视化过程,试验确定的盐穴造腔施工和形态控制参数可应用于现场工程。
The geological conditions of the salt cavern reservoir are layered, with many interbeds and large differences in burial depth. Controlling the cavity shape of the multi-salt cavern is crucial to the long-term stability and safe operation of salt cavern reservoirs. Successfully developed salt cavern modeling and shape control test device, in order to simulate indoor to determine the optimal salt cavern cavity forming process and form control parameters provide advanced test means. The device is designed and manufactured according to the principle of similarity, which is composed of the test device frame, multi-field coupling simulation system, injection and production circulation system, injection and withdrawal dynamic parameter measurement and control system and salt chamber dynamic data acquisition system. The experimental device frame is the main part Structure, using modular design; multi-field coupling simulation system can simulate moderate temperature stress; injection and recovery system can simulate water injection and control of oil pad; injection dynamic parameters measurement and control system can be achieved inside and outside the tube height, probe height and angle Control; salt chamber dynamic data acquisition system can achieve the visualization of the process of making video recording and real-time measurement of morphology. The experimental device can simulate the influence of different construction techniques and parameters on the cavern making process and the morphological development of multi-layered salt rock under multi-field coupling conditions. Through the cavity modeling test of salt core specimen of different sizes and the prediction of cavity development and the estimation of oil injection, it is proved that the experimental device can simulate the visualization of multi-salt salt cavity cavities well. And morphological control parameters can be applied to field engineering.