聚合物驱后剩余油分布物理模拟实验研究

Laboratory evaluation of distribution characteristics of remaining oil after polymer flooding

在今后几年里,河南双河油田几个注聚区块将陆续完成后续水驱,聚驱后如何进一步提高采收率是油田技术决策部门十分关心的问题,而聚合物驱后剩余油分布特征对于合理选择聚驱后进一步提高采收率措施十分重要。针对矿场的实际需求,通过分析河南双河油田地质资料,研制出具有该油田典型地质特征的3种物理模型,并在其上对影响聚驱后剩余油分布特征的因素进行了实验研究。实验结果表明,地层非均质性、聚合物溶液粘度和相对分子质量是影响剩余油分布的主要因素,聚驱后剩余油主要分布在中、低渗透层,其中,低渗透层的剩余油饱和度为33.0％～52.2％。

A few pilot tests of polymer flooding in Shuanghe area of Henan oilfield will be finished in next year. Petroleum engineers care what kind of EOR technology should be used after polymer flooding. In order to select a suitable EOR method, it is important to understand the remaining oil distribution. According to the re-quirement of oilfield development, three kinds of artificial physical models, which hold homogeneous geological characteristics of Shuanghe oilfield, was manufactured and a group of flooding experi-ments had been plerformed by using three kinds of polymers and vis-cosity. The experimental data show that homogeneous property of reservoir, molecular weight of polymer and viscosity of polymer so-lution are the main factors, which affect the distribution of remaining oil, and most of remaining oil is in the middle and low perme-able layers, especially the low ones. Usually, the range of remaining oil saturation in low permeable layer is 33. 0%-52. 2% .