聚合物驱岩石电阻率变化特征的实验研究

Experiment on Rock Resistivity in the Process of Polymer Flooding.

为了研究聚合物驱油过程对岩石电阻率的影响,采用聚合物驱替完全饱和盐水的岩样和聚合物驱替饱含油岩心的实验方法,测量了聚合物驱替过程中的岩石电阻率变化,对聚合物驱所引起的岩石电阻率的变化规律和特征进行了分析和讨论。实验结果表明,聚合物驱岩石电阻率变化特征类似于淡水驱替过程中的岩石电阻率变化规律。当聚合物溶液矿化度小于饱和岩石的盐水溶液的矿化度时,聚合物驱水过程中岩石的电阻率随聚合物溶液注入量的增加而逐渐升高,当聚合物注入量小于岩石体积1倍时岩石电阻率的变化不大;当聚合物溶液电阻率大于饱和岩石的盐水溶液的电阻率时,聚合物驱油过程中岩石电阻率随含水饱和度的增加呈“S”型变化;当聚合物溶液电阻率接近或小于饱和岩石的盐水溶液的电阻率时,聚合物驱油过程中岩石电阻率随含水饱和度的增加而降低;聚合物驱替采油时要考虑盐度对聚合物粘度的影响。实验结果为已实施聚合物驱油油田的测井资料评价提供了实验依据和基础。

To research the influence of polymer flooding on the core resistivity, the methods that polymer displaces the salt-saturated core and the oil-saturated core were used to measure the core resistitvity changes in the process of polymer flooding, and the core resistivity changes were analyzed and discussed. The experiment shows the core resistivity changing property in polymer flooding is something like the changing property in fresh water flood. The experiment gives some new viewpoints and provides a good foundation for logging data interpretation in the polymer flooding oilfield.