摘要
利用动态光散射(DLS)、电镜扫描(SEM)和岩心驱替实验等方法,对高温高矿化度条件下聚合物溶液和"聚合物/表面活性剂"二元复合驱油体系中聚合物分子线团尺寸及其影响因素和在中低渗油藏环境下的渗流特性进行了实验研究,并对其渗流规律进行了机理分析.结果表明,在高温高矿化度条件下,随聚合物浓度增加,聚合物溶液和"聚合物/表面活性剂"二元复合驱油体系中聚合物分子线团尺寸Dh都呈现"先增大后减小"的变化规律.非离子型表面活性剂以胶束聚集体形式吸附在聚合物分子链上,造成二元复合驱油体系中聚合物分子线团尺寸Dh大于聚合物溶液.在溶剂水矿化度较高和岩心渗透率较低条件下,后续注入水的冲刷和稀释作用造成岩心内滞留聚合物浓度降低,聚合物分子线团尺寸Dh增加,最终导致聚合物溶液和"聚合物/表面活性剂"复合体系的残余阻力系数大于阻力系数.
The dimension of polymer molecular coil in polymer solution and ＂polymer/surfactant＂ displacement system and its influential factors were studied under the condition of high temperature and salinity, as well as the seepage property under the medium-low permeability reservoir environment, and the mechanism of their flowing rule was also analyzed, by making use of dynamic light scattering （DLS）, scanning electron microscopy （SEM） and core flow experiment. The results show that, under the condition of high temperature and salinity, the dimensions of polymer molecular coils （Dh） both in the polymer solution and ＂polymer/surfactant＂ displacement system present a variation rule of ＂increases first and then decreases＂, with the polymer concentration increases. In addition, the surfactant is absorbed to polymer molecule in the form of micellar aggregate, resulting in a greater Dh in the ＂polymer/surfactant＂ displacement system when compared to the polymer solution. Under the condition of high salinity of solvent water and medium-low core permeability, the erosion and dilution of following injecting water can result in a concentration decreasing of retained polymer in the core, thereby the Dh increases, and eventually the residual resistance factors both of the polymer solution and ＂polymer/surfactant＂ system are greater than their resistance factors.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2010年第12期1229-1234,共6页
Acta Chimica Sinica
基金
国家科技重大专项"海上油田丛式井网整体加密及综合调整技术"(No.2008ZX05024-04)
国家重大专项课题"高效深部液流转向与调驱机理研究"(No.2008ZX05010-004)资助项目
关键词
聚合物
二元复合驱油体系
矿化度
结构形态
分子线团尺寸
渗流特性
机理分析
polymer solution
＂polymer/surfactant＂ displacement system
salinity
configuration
molecular coil dimension
seepage property
mechanism analysis
