聚合物驱后恢复水驱平行管试验研究

Research on the technologies of improving recovery efficiency after polymer flooding

针对聚合物驱后恢复水驱 ,含水率上升迅速的实际情况 ,通过填砂管平行流动试验 ,分高、中、低 3种渗透率模拟油藏非均质性条件 ,采用 3种聚合物驱后提高采收率的试验方法 ,分析研究了压力、相对吸水量、各渗透层采收率、含水率的变化 ,以评价聚合物驱后的几种提高采收率方法。研究表明 :聚合物驱后不论水驱时间长短 ,只进行深部调剖 ,对有效封堵高渗透层、控制高渗透孔道的吸水能力和提高后续水驱的波及系数效果都不明显 ;而聚合物驱后恢复一段水驱 ,通过絮凝和固定技术 ,可以高效地调整注水剖面 ,有效地提高后续水驱的波及系数 。

After polymer flooding, water cut rapidly rise during succedent water flooding. In order to study the technological measures of enhancing recovery efficiency, the heterogeneous reservoir composed of high, medium and low permeable formations are simulated, and three combination technologies are tested. The testing results show that, after polymer flooding, if only deep profile control is adopted, the effects of deep profile control on plugging high permeability reservoirs, controlling the water intake capacity of high permeability pore passages and increasing the sweep efficiency of water flooding are not obvious whether the duration of water flooding is long or short. If water flooding carry out some time after polymer flooding, flocculant and hardening agent are added, which can effectively improve water flooding profile and increase the sweep efficiency of succedent water flooding, so the recovery efficiency is greatly increased.