关键词: 聚合物, 调剖, 粘弹效应, 试验

Abstract: It has been found that the flow behavior of water through rock samples with retained polymer molecules in it does not follow Darcy's law. Permeabilities decrease with the decrease of pressure differential or flow rate, which has been observed when routine measurements for determining rock permeability to water is being conducted. This phenomenon is believed to be attributed to the viscoelastic effect of the retained molecules. The mechanism of the improvement of injectivity profiles by viscoelastic effect of the molecules and a new technique for injecetion profile adjustment are presented. The relationship between the polymer slug size and the extent to which injection profiles can be modified was studied. The effects of four factors, such as polymer type, polymer solution concentration, slug injection mode and injection rate on the effectiveness of the new technique was also investigated.