Microscopic experiment on efficient construction of underground gas storages converted from water-invaded gas reservoirs  

作　　者：JIANG Tongwen QI Huan WANG Zhengmao LI Yiqiang WANG Jinfang LIU Zheyu CAO Jinxin 

机构地区：[1]PetroChina Company Limited,Beijing 100007,China [2]National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China [3]College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China [4]PetroChina Petroleum&New Energies Company,Beijing 100007,China [5]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China

出　　处：《Petroleum Exploration and Development》2024年第1期203-212,共10页石油勘探与开发（英文版）

摘　　要：Based on the microfluidic technology,a microscopic visualization model was used to simulate the gas injection process in the initial construction stage and the bottom water invasion/gas injection process in the cyclical injection-production stage of the underground gas storage(UGS)rebuilt from water-invaded gas reservoirs.Through analysis of the gas-liquid contact stabilization mechanism,flow and occurrence,the optimal control method for lifecycle efficient operation of UGS was explored.The results show that in the initial construction stage of UGS,the action of gravity should be fully utilized by regulating the gas injection rate,so as to ensure the macroscopically stable migration of the gas-liquid contact,and greatly improve the gas sweeping capacity,providing a large pore space for gas storage in the subsequent cyclical injection-production stage.In the cyclical injection-production stage of UGS,a constant gas storage and production rate leads to a low pore space utilization.Gradually increasing the gas storage and production rate,that is,transitioning from small volume to large volume,can continuously break the hydraulic equilibrium of the remaining fluid in the porous media,which then expands the pore space and flow channels.This is conducive to the expansion of UGS capacity and efficiency for purpose of peak shaving and supply guarantee.

关 键 词：water-invaded gas-reservoir underground gas storage cyclical injection-production gas-water contact gas storage and production rate UGS capacity expansion control method 

分 类 号：TE972.2[石油与天然气工程—石油机械设备]