烟台水封能源洞库水幕钻孔布设方案优化

Seepage Analysis of Water-sealed Petroleum Storage Cavern Based on the Theory of Discrete Crack Network Model

地下水封能源洞库是目前我国石油战略储备基地的重要工程建筑。水幕巷道的水幕钻孔布置是保障和检验洞库本身水封气密性的关键工程措施,其对应的水幕效率试验则是水封能源洞库中核心水文地质试验。目前,水幕钻孔的布置及水幕效率试验主要参考国外公司的工程经验,操作流程为初始阶段等间距布置的多阶段线性工作过程,耗费时间较长。为进行优化,依托烟台某商业储备库工程项目,从子库区裂隙统计入手,利用数值模拟软件Fracman建立了研究区离散裂隙网络,并通过立方定律求其渗透系数张量;分析了渗透系数张量特征,对水幕效率试验中的低水幕效率岩体进行了预判,并与实际试验结果进行了对比,根据一致性较好的模拟结果提出了基于离散裂隙网络模型的初始阶段不等间距的水幕钻孔布设及水幕效率试验思路。

Water-sealed energy cave is a significant building type in petroleum strategic reserve base in China. The arrangement of boreholes in water curtain tunnels of water-sealed petroleum cave is key engineering measure to checkout and guarantee gas tightness of the water-sealed petroleum cave, while the relevant water curtain efficiency test is core hydrogeology test. Recently, the arrangement of boreholes and water curtain efficiency test is mainly implemented according to engineering experience of foreign companies, with technological process of equal interval multistage linear initial stage, which costs a long time. To have an optimization design, with the program project of business reserve library in Yantai City an example, statistical fracture in sub-reservoir zone is used to build discrete fracture network by Fracman software, and permeable coefficient tensor is obtained through Cubic Law. Then the characteristic of permeable coef- ficient tensor is analysed to prognose the low water curtain efficiency zone in water curtain efficiency test. Based on the fine simulation result acquired, a method of water curtain holes arrangement and efficiency test with an unequal interval in their initial stage is put forward based on the theory of discrete fracture network.