多相流地下水封液化石油洞库水幕系统的性能评价

1. 中铁隧道集团一处有限公司;2. 中国地质大学(武汉)环境学院;3. 沈阳龙昌管道检测中心

地下水封洞库;水幕系统;强裂非均质裂隙岩体;随机渗透率;多相流模拟;模型试验

Performance assessment on water curtain system for multiphase flow water-sealed underground liquefied petroleum storage caverns
GUO Defu1, CHEN Gang2, DANG Na3

1. The First Construction Division Co. Ltd. of China Railway Tunnel Group;2. School of Environmental Studies, China University of Geosciences (Wuhan);3. Shenyang Longchang Pipeline Inspection Center

water-sealed underground storage caverns, water curtain system, strongly heterogeneous fractured rock, random permeability, multiphase flow simulation, model test

备注

为探讨复杂地质条件下地下水封洞库工程建设中水幕系统设置的必要性,以及严格的水幕效率试验、气密性试验的重要性,基于地质统计学原理进行研究区随机渗透率计算,建立考虑研究区渗透性强烈非均质条件的丙烷洞库二维剖面多相流,进行不同工况下油气储品泄漏的运移模拟。结果 表明:丙烷在天然地下水水封条件下极易发生泄漏,其污染晕主要向洞室上方运移,长期泄漏会呈伞状遍布洞室上方整个含水层;水平水幕系统可以有效抑制污染晕向上运移,防止泄漏物进入低压环境后发生气化,将污染晕受限在一定空间范围内;垂直水幕系统对抑制污染晕的水平运移效果明显,对不同储品库产生的污染晕有明显的隔离作用;含贯穿裂隙的模型模拟结果表明开展严格的水幕效率试验及气密性试验,及时发现不饱和裂隙并采取措施,对保障水幕系统的有效运行至关重要。(图8表2,参[25]

To study the necessity of setting up water curtain system under complex geological conditions in the construction of water-sealed underground storage cavern, as well as the importance of strict water curtain efficiency test and air tightness test, the random permeability calculation, based on geostatistics principle, was conducted in the study area, the twodimensional sectional multiphase flow propane storage cavern was built taking into account the strong heterogeneity of permeability in the study area, and the transport simulation of the stored oil and gas leakage under different conditions was performed. The results indicate that propane is extremely easy to leak under the condition of natural groundwater sealing, with its pollution halo mainly transported above the storage cavern, and long-term leakage may bring about umbrella-shaped distribution throughout the aquifer above the storage cavern. The horizontal water curtain system is able to effectively inhibit the upward transport of the pollution halo, prevent the leakage from vaporing when coming to the low-pressure environment, and confine the pollution halo within a certain space range. The vertical water curtain system obviously inhibits the horizontal transport of pollution halos and significantly isolates pollution halos generated by different storage caverns. The simulation results of the model with through cracks suggest that, for the effective operation of water curtain system, it is crucial to carry out strict water curtain efficiency test and air tightness test, timely find out unsaturated cracks and take measures. (8 Figures, 2 Tables, 25 References)