水驱气藏型储气库运行动态产能评价

Productivity evaluation of operation dynamics water-flooding gas storage

水驱气藏型储气库运行过程中伴随有边水运移,导致储层气、水两相分布及渗流特征趋于复杂,气库动态运行参数指标难以预测。为正确揭示水驱气藏型储气库注、采运行规律,针对气库储层地质特征,设计了储气库建设及注采运行智能模拟系统,并开展了注采模拟对比实验;系统分析了水驱气藏型储气库运行规律,认为边水运移是影响气库储层动用状况的主要因素,并从室内物理模拟角度提出水驱气藏型储气库运行动态预测方法;考虑边水运移、岩石膨胀作用及储层展布特征的对应关系,建立了水驱气藏型储气库动态运行识别图版。矿场样本检验结果表明,所提出的分析方法行之有效,可以作为水驱枯竭气藏型储气库的产能评价标准。

During the operation of water-flooding gas reservoir storage,edge water migration is often resulted in gas-water twophase distribution and the complexity of percolation characteristics,so it is always hard to predict the dynamic operation indexes of gas storage.In order to correctly illustrate the operation rules of injection-production in water-drive gas storage,the intelligent simulation systems of storages construction and injection-withdrawal running were designed according to the geological characteristics of reservoirs,and then a lot of stimulated comparing experiments were finished.By analyzing the operating regularity of water flooding gas storage,it was believed that edge-water movement could be the mainly factor of influence the productive capacity of reservoirs on gas storage,and the mathematical formulas for forecasting the operating dynamics of water flooding gas storage was deduced in terms of indoor physical stimulation.Chart board for forecasting dynamical operation efficiency of gas storage in gas reservoir with water flooding was presented according to corresponding relationships among edge-water movement,expansion effect of reservoir rocks and formation distribution characteristics.The analytical method proposed though filed sampling test results was proved to be verified effective,and the recognition chart board will provide effective evidence for productivity evaluation of water flooding gas storages.