Abstract: A method for determining oil and water saturations in cores by volume-CT scanner was developed on the basis of X-ray hardening treatment,X-ray drifting correction,martix transformation of imagines and position correction of CT images with volume-CT technology.It comes to the conclusion that this volume-CT technology can be used to measure the oil and water saturations in both artificial and natural cores during and after polymer flooding. Experiments indicated that there was a fingering phenomenon in the stage of water flooding,and heterogeneous water sweep channels existed clearly during water flooding.Oil saturation in water channels was obvious lower than that of other areas.The sweep volume was enlarged,and the residual oil was enriched effectively.The oil recovery was enhanced,after polymer slug was injected into the core.The application of volume-CT technology to core flooding shows that polymer flooding not only plays a very important role in improvement of sweep volume,but also enhances oil recovery,in comparison to water flooding.

Key words: volume-CT technology, polymer flooding, cores, water saturation, oil saturation, experiment

摘要： 对CT图像进行了X射线硬化处理、X射线漂移校正、图像矩阵变换及体积CT位置校正,研究出用体积CT对岩心流体饱和度进行测量的技术。利用该技术对聚合物驱过程中油水饱和度分布进行了测量,结果表明,该技术适合于测量聚合物驱过程中油水饱和度分布。尽管试验中使用了均质岩心,在水驱阶段形成了明显的水窜通道,窜流通道上的油饱和度明显低于其他区域,微观波及的不均匀性非常明显。注入聚合物段塞后,有效地富集了水驱之后的剩余油,利用聚合物驱,除了能改善波及体积外,还成功地观察到水驱之后进一步提高洗油效率的现象

关键词: 体积CT技术, 聚合物驱, 岩心, 含水饱和度, 含油饱和度, 试验研究