针对天然能量开发后直接转聚驱开发油田水平井聚合物驱见效时间和见效规律与高含水期聚合物驱有较大差异的问题,运用生产动态分析,提出了更高效便捷的以油井产液产油、含水及沉没度的变化特征来判别聚合物驱的见效时间点。在确定见效时间的基础上,将油井注聚合物后的生产阶段划分为诱导见效期、主导见效期和后续见效期,并建立了注入孔隙体积与所处阶段的关系。开展了不同注入孔隙体积下注入压力、注入能力、产液产油能力及综合含水的变化特征研究,明确了各阶段现场措施的目的及主要措施内容。并根据已实施聚驱井区的油藏条件和聚驱过程暴露出的突出问题,评价这些因素对聚驱井组开发效果的影响,明确了影响目前聚驱井区开发效果的主要因素。该研究为油田聚驱井组现场的高效管理提供了可靠的依据,并明确了下步转驱井组的目标井区。

In order to solve the problems that the effectual time and effective features of polymer flooding in horizontal wells of oilfields developed directly after natural energy development are quite different from those of polymer flooding in high water-cut periods, a more efficient and convenient way to determine the effectual time of polymer flooding is proposed by production dynamic analysis, that is the change features of production capacity, water cut and submergence depth. Based on the effectual time, the production period after polymer injecting is divided into the induced effective period, the dominant effective period and the subsequent effective period, and the relation between the injected pore volume and the stage is established. Then, a study has been conducted to characterize the changes in injection pressure, injection capacity, oil production capacity and integrated water content at different injection pore volumes, and the purpose and main content of the on-site measures at each stage have been clarified. According to the reservoir conditions in the polymer flooding well area and the outstanding problems exposed during the polymer flooding process, the influence of these factors on the development effect of the polymer flooding well group is evaluated and the main factors affecting the development effect of the current polymer flooding well group is clarified. This research provides a reliable basis for the efficient management of the oilfield polymer flooding well group on-site, and clarifies the target well areas of the subsequent conversion well group.