强边底水海相砂岩油藏长期水驱开发机理及数模研究

Long term water drive development mechanism and mathematical modeling of marine sandstone reservoirs with strong water

南海东部海相砂岩油田生产实践表明,强水驱海相砂岩岩心的驱油效率远比传统实验岩心结果高,主要由于高倍水驱后岩石润湿性从亲水转变为强亲水,驱油效率也大幅提升,但相关认识难以应用于油藏数值模拟当中。通过CMG软件离子化学反应和相吸附方法,控制化学反应速率与水流速度成正相关关系,根据网格吸附离子浓度进行相渗插值,解决了油藏模拟中长期水驱后相渗时变问题。

The production practice of marine sandstone oil fields in the eastern part of the South China Sea has shown that the oil displacement efficiency of strong water drive marine sandstone cores is much higher than that of traditional experimental cores.This is mainly due to the transformation of rock wettability from hydrophilic to strong hydrophilic after high water drive,and the significant improvement of oil displacement efficiency.However,relevant knowledge is difficult to apply to reservoir numerical simulation.Through the method of ion chemical reaction and phase adsorption in CMG software,the positive correlation between Reaction rate and water flow rate is controlled,and the phase permeability interpolation is conducted according to the grid adsorption ion concentration,which solves the problem of time-dependent phase permeability after medium and long-term water flooding in reservoir simulation..