多元泡沫复合驱宏观渗流机理的三维物理模拟研究

利用"高温高压复杂驱动体系三维物理模拟系统"进行了多元泡沫复合驱提高原油采收率宏观渗流机理的三维物理模拟研究.利用模型上布置的差压传感器和饱和度测量探针,测量了泡沫复合驱的开采效果、压力场和饱和度场,研究了泡沫复合驱提高波及效率与驱油效率的宏观渗流机理.泡沫驱提高采收率的机理是通过贾敏效应改善驱替液的波及体积和洗油效率,泡沫驱能够提高地层的整体压力,在井附近出现显著的压力降漏斗.主对角线两侧的剩余油在注泡沫以后,获得明显的动用,在油藏内形成一个从主流线向两侧扩展的油墙.采收率增值对应着泡沫液突破点,且在泡沫液突破之后有相对较长的低含水生产阶段.

3D physical simulation about macroscopic flow mechanisms for multi-component foam flooding

Based on 3D physical modeling system for complicated driving system under HT/HP condition, the 3 D physical simulation research on macroscopic flow mechanisms for multi -component foam flooding improving recovery factor has been done. With the application of differential pressure unit and saturation measuring needle in the model, the development results, pressure field and saturation field for multi - component foam flooding are measured. The fluid flow mechanisms in porous media for increasing swept efficiency and displacement efficiency during foam flooding are investigated. The mechanism of enhancing oil recovery factor for foam flooding is that the swept volume and oil displacement efficiency can be improved through Jamin effect. The whole pressure of the formation can be improved during foam flooding, and obvious pressure cone of depression nearby the wellbore can be appeared. After foam injection, the remaining oil on both sides of main diagonal line is distinctly swept, and an oil belt extending from the main stream line to both sides can be formed. Recovery factor increase is corresponding to the breakthrough point of foam fluids, and after foam fluids breakthrough there is a longer oeriod of low water cut production.