海上早期聚合物驱开发特征研究

Research of Early Polymer Flooding Characteristics in Offshore Oilfield

2006年渤海L油田开展了早期聚合物驱矿场试验,至今取得了一定的增油效果。目前陆地油田、渤海J油田高含水期聚合物驱的矿场试验中,见效后生产特征出现明显的含水下降漏斗或下降趋势,而在渤海早期注聚L油田见效后并未出现明显的含水下降漏斗或下降趋势,这主要由于L油田开发早期见水后含水处于快速上升阶段,聚合物驱"降水效果"不足以抵消水驱"含水快速上升趋势"。重点分析了渤海L油田早期聚驱注入压力及含水特征,及数值模拟研究含水在聚驱与水驱情况下的不同表现,说明早期聚驱开发特征。为早期开展聚合物驱矿场试验设计及效果评价提供参考依据。

Pilot test of early polymer flooding was performed in Bohai oilfield in 2006. And some effect of increasing oil has been achieved up to now. Currently polymer flooding pilot test in onshore oilfield and Bohai J oilfield at high water cut stage indicates that the production characteristics after response exhibited an obvious declining funnel or a downtrend of water cut. However, Bohai L oilfield which also performed early polymer injection did not show significant water cut drop funnel or declining trend. This is mainly because L oilfield was in a rapidly increasing stage of water cut after water breakthrough during the early development, the ＂water decreasing effect＂ of polymer flooding was insufficient to offset the ＂water rapidly increasing trend＂ of water flooding. This paper focused on the injection pressure and water-cut features in the early stage of polymer flooding period in Bohai L oilfield, studied the different performance of numerical simulation analysis of water cut in the case of both polymer flooding and water flooding, so as to explain the development characteristics of early polymer flooding. All these provide a reference basis for the pilot test design and effect evaluation of early polymer flooding.