层状盐岩小井间距双井水溶造腔流场相似模拟研究

发布时间：2018-06-22 13:48

本文选题：层状盐岩 + 水溶溶腔　；参考：《工程科学与技术》2017年06期

【摘要】：为解决层状盐岩单井水溶造腔过程中建槽周期长,提管工艺复杂等问题,开展层状盐岩小井间距双井水溶造腔技术研究。拟采用选定物理法建立相似试验平台,探讨小井间距双井水溶造腔流场及浓度场特征,揭示双井水溶溶腔腔体扩展与流场的联系。结果表明:双井水溶造腔过程中腔体流场可以划分为4个区域:边界溶蚀区、浮羽流区、对流扩散区和底部饱和区,各个区域相互影响。浮羽流区是驱动流体运移的关键区域,根据浮羽流区流场特征建立相应的流场模型;根据宏观流动特征,对流扩散区分为强扩散区和弱扩散区;边界溶蚀区对双井水溶溶腔腔体扩展有显著影响;饱和区示踪特征不明显但浓度分层明显。通过对比分析双井造腔和单井造腔模型试验结果,发现双井水溶造腔工艺有利于盐穴建槽期,研究为小井间距双井水溶造腔技术的应用提供一定的理论基础,对盐穴储气库的优化建造具有重要意义。
[Abstract]:In order to solve the problems of long period of channel construction and complicated pipe lifting technology in the process of single well formation of layered salt rock by water solution, the technique of water dissolution cavity formation in two wells with small well spacing in layered salt rock is studied. A similar test platform is established by using the selected physical method to study the characteristics of the flow field and concentration field of the water solution cavity in the small well spacing two wells, and to reveal the relationship between the expansion of the water solution cavity and the flow field in the double well. The results show that the cavity flow field can be divided into four regions: boundary erosion zone, floating plume zone, convection diffusion zone and bottom saturated area. The floating plume region is the key region to drive the fluid migration. According to the characteristics of the floating plume flow field, the corresponding flow field model is established, and according to the macroscopic flow characteristics, the convection diffusion can be divided into the strong diffusion zone and the weak diffusion zone. The boundary corrosion zone has a significant effect on the expansion of water solution cavity in double wells, and the tracer characteristics of saturation zone are not obvious but the concentration stratification is obvious. By comparing and analyzing the model test results of double-well cavities and single-well cavities, it is found that the double-well water-soluble cavities process is beneficial to the period of salt cavern construction. The research provides a theoretical basis for the application of water-soluble cavities technology in small well spacing and double-well wells. It is of great significance to optimize the construction of salt cavern gas storage.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;重庆市市政设计研究院;
【基金】：国家自然科学基金资助项目(51574048;41672292;51604044) 中央高校基金资助项目(106112016CDJZR245518)
【分类号】：TU45

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