二类油层聚合物驱开发动态特征

由于二类油层沉积环境变化大，平面和纵向上具有严重的非均质性，造成了聚合物驱开发动态特征与主力油层相比发生了较大变化。本文通过对比和分析大量的二类油层和主力油层开发动态资料，得到了二类油层聚合物驱驱油特点：一是注入能力低，井组间压力不均衡；二是采液强度低，产液量下降幅度小；三是增油倍数低，增油效果差；四是含水下降幅度小，见效时间差异大。对开发动态的深入剖析，为研究二类油层的开发规律和制定合理的增产措施奠定了坚实的基础。

The behavioral characteristics of polymer flooding in secondary reservoirs

Because of the diverse sedimentary environments and the severe heterogeneity on the plane and vertical in secondary reservoirs, their behavioral characteristics of polymer flooding have changed largely than those of major reservoirs. In this paper, by the way of comparing and analyzing large of performance data of major reservoirs and secondary reservoirs, the displacement characteristics of secondary reservoirs has been gained as following: firstly, low injecting capacity and uneven pressure among well groups; secondly, low liquid production per unit thickness and small decline range of liquid producing capacity; thirdly, low multiple of oil production and bad enhancing oil production effect; fourthly, small decline range of water cut and great difference of response time. Above researching results shows that deep analysis of behavioral characteristics of secondary reservoirs is the strong foundation of researching development rule and establishing reasonable stimulation.