摘要
利用开采后已枯竭的油气田建造天然气地下储气库 ,是平抑城市供气峰值波动的最合理有效的手段之一。在储气库进行注采动态运行时 ,避免注入气与垫层气发生混合是至关重要的技术问题。通过分别建立三维两相渗流模型和气体扩散模型 ,采用跳跃式的求解方法 ,首先采用有限差分的分数步长算法 ,求解出库内各点瞬态压力分布 ,再由达西定律确定出速度分布 ,然后采用特征线中心差分格式求解气体扩散数值模型 ,动态确定出垫层气的需求量和注采天然气所需的最佳储气压力、残存气与储存天然气的混合而导致的回采气体浓度的变化 。
Using depleted oil and gas fields to establish underground gas storages is one of the most effective and reasonable ways to balance city gas delivery. It is very important to avoid mixing the injected gas with the formation gas during injecting or recovering operation in the storage. With establishing 3-D, 2 phases percolation model and gas diffusion model respectively .using leap solution, first the instant pressure distribution in the storage will be obtained by fraction step-length algorithm of finite difference, then the velocity distribution will be determined by Darcy's law. After that, all can be solved with the difference format of characteristic line centers for the gas diffusion numerical model, the formation gas demand volume and the optimal storing pressure while injecting or recovering, the density variation of the recovered gas since mixing the formation gas with the story gas. So the method provides the scientific ground to guarantee optimal operation of the gas storage with full load.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2003年第2期102-105,共4页
Natural Gas Industry
基金
黑龙江博士后基金资助项目 (LRB -KY 0 10 2 6 )成果
