特殊油藏聚合物驱物理模拟实验研究

Physical simulation of polymer flooding in special reservoirs

聚合物驱是提高油藏开发效果的有效方法,室内和矿场数据表明,聚合物驱可在水驱基础上提高采收率10%左右。江苏油田部分区块具有储量低、非均质性严重、地层温度高和注入水矿化度高等特点,需要对聚合物驱油技术在这些区块上的适应性进行评价。针对油藏开发实际需求,利用现代物理模拟方法,对真15等区块聚合物驱增油效果进行了评价。结果表明,聚合物用量、浓度、段塞组合方式、注入时机和油藏非均质状况等因素对聚合物驱增油效果存在影响。对于平均渗透率高、非均质性比较严重的区块,在化学剂费用相近条件下,"调剖+聚合物驱"或"聚合物驱+调剖+聚合物驱"段塞组合方式增油效果要优于单纯聚合物驱。

Polymer flooding is an effective method to improve oil recovery.Indoor and field data show that poly- mer flooding can further improve oil recovery by about 10% based on water flooding.Some blocks in Jiangsu oil- field are characterized by low reserves,serious heterogeneity,high formation temperature and high salinity of in- jected water.It is necessary to evaluate the adaptability of polymer flooding in these blocks.The effect of poly- mer flooding in blocks including Zhen 15 is evaluated through modem physical simulation.The result shows that polymer loading,concentration,slug composition,injection time and reservoir heterogeneity may affect polymer flooding performance.For blocks with high average permeability and serious heterogeneity,the stimulation effect of slug composition of'profile control+polymer flooding'or'polymer flooding+profile control+polymer flooding'is superior to simple polymer flooding at similar cost of chemicals.