聚合物驱宏观渗流机理的三维油藏物理模拟研究

3-D physical modeling on macroscopic fluid flow mechanism of enhanced oil recovery by polymer flooding

利用高温高压复杂驱动体系三维物理模拟系统研究聚合物驱提高原油采收率的宏观渗流机理。用模型上布置的压差传感器和饱和度测量探针,测量了聚合物驱的开采效果、压力场和饱和度场变化。对于三维物理模型,聚合物在油藏内的吸附、滞留等作用使流动阻力增大、油藏压力上升、液流转向。聚合物从主流线流向两侧的剩余油区,不仅驱替出主流线上的剩余油,而且通过提高波及范围驱替出两侧剩余油区内的剩余油,在油藏内形成一个从主流线向两侧扩展的油墙,提高了宏观波及体积。三维物理模拟研究动态饱和度场和压力场,能够更好地描述聚合物驱提高原油采收率的驱油机理。

The macroscopic fluid flow mechanism of EOR by polymer flooding is studied using ＂the 3-D physical modeling system of complicated driving system in HT/HP conditions for EOR＂. Production performance, pressure field and saturation field are measured with a differential pressure unit and saturation measuring probes. The resistance increased, the pressure went up and the flow direction changed under the physical and chemical actions of adsorption, retention of polymer. The polymer changed the flow direction from the main stream to remaining oil regions on its either side and displaced the remaining oil. The polymer flooding not only displaced the residual oil in the main stream, but also displaced that on its either side by enlarging swept volume from the main stream to the side. The dynamic pressure and saturation fields in the 3-D physical model can better describe the oil displacement mechanism of EOR by polymer flooding.