高含水后期非均质层渗流特征室内实验

LABORATORY EXPERIMENT ON FLOW CHARACTERISTICS OF HETEROGENEOUS RESERVOIR AT LATE STAGE OF HIGH WATER CUT

针对大庆喇嘛甸油田高含水后期低效、无效循环注水开发状况,利用并联岩心水驱技术,描述了非均质层油水渗流规律,综述了高含水后期注水开发时渗流特征及产液变化规律.结果表明,非均质油层渗透率级差、高渗透层厚度比例及长期水冲刷后高渗透层孔隙结构发生变化是高含水后期油层注入水产生低效、无效循环的主要原因.该研究将为高含水后期注水无效循环和低效循环的治理提供合理的理论及实验依据.

In view of low and non-efficiency cycles of water flooding development at the late stage of high water cut of Lamadian Oilfield, with the help of paralleled core water flooding technique, this paper describes the oil and water flows＇ laws in the heterogeneous layers and summarizes the changing laws of the flow characteristics and liquid production while water flooding at this stage also. The results show that the main reasons of low and non-efficiency water cycles at this time are the permeability variance of heterogeneous oil layers, the high proportion of high-permeability layers and the long time of water flush. The above studies can provide rationally theoretical and experimental evidences for the treatments of low and non-efficiency water flooding and oilfield development at the late stage of high watercut.