摘要
在滞留有聚合物的岩心中,水的流动规律不符合达西定律。对含有滞留聚合物分子的岩心进行常规的水测渗透率试验。发现渗透率随流动压差或流速降低而降低,这一现象归结为岩心中滞留聚合物分子的粘弹回复效应。本文研究了粘弹回复调整吸水剖面的机理,提出了一种利用滞留聚合物分子粘弹效应调剖的方法,并对聚合物段塞体积与调剖深度的关系以及聚合物类型、溶液浓度、段塞注入方式和注入速度等四种因素对调剖效果的影响进行了研究。
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 de- crease of pressure differential or flow rate, which has been observed when routine measure- ments for determining rock permeability to water is being conducted. This phenomenon is be- lieved 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 relation- ship 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 concentra- tion, slug injection mode and injection rate on the effectiveness of the new technique was also investigated.
出处
《石油学报》
EI
CAS
CSCD
北大核心
1993年第4期76-82,共7页
Acta Petrolei Sinica
