海上聚合物驱油田水动力学法井网调整实验研究

Experimental Study on Well Network Adjustment of Offshore Polymer Flooding Oilfield by Hydrodynamics Method

为了探索海上聚合物驱油田调整技术,通过室内物理模拟研究水动力学法井网调整技术的开发效果。采用微电极测定聚合物驱前缘位置,根据阿尔奇原理反算模型上不同位置、不同时刻的含油饱和度,利用软件绘制平面含油饱和度分布图。通过采出程度和含油饱和度的变化,对比分析了水动力学法井网调整前后的开发效果。结果表明,通过转注改变井网系统的水动力学,有利于聚合物前缘均匀推进,扩大波及体积,有效驱替出调整前未波及到的反九点井网边部生产井之间的剩余油。排状井网减小了注采井距,增大了驱替压差,在总注入PV数减少的条件下采出更多的剩余油。

In order to explore the well pattern adjustment technology for the polymer flooding of offshore oilfield,the development effect of hydrodynamic well pattern adjustment technology was studied through laboratory physical simulation. The front position of polymer flooding is determined using microelectrode,the oil saturation at different locations of the physical model at different times is determined by inversely calculating according to the Archie principle,and the plane distribution diagram of oil saturation is obtained using software.The development effects of the well pattern before and after the hydrodynamic adjustment are compared according to the change of recovery degree and oil saturation. The result shows that to change the hydrodynamics of well network system by oil wells transforming into water injection wells is beneficial to the uniform propulsion of the polymer flooding front and the expansion of swept volume,and can effectively drive the remaining oil between the production wells at the edge of inverted nine-spot pattern. In addition,row well pattern reduces injection-production well spacing and increases displacement pressure,and more remaining oil can be produced by the row well pattern under the condition that total injection PV number is decreased.