含聚污水中残余聚合物对聚驱采收率影响机理研究

发布时间：2018-06-19 04:38

本文选题：聚合物体系 + 静态吸附　；参考：《东北石油大学》2017年硕士论文

【摘要】：目前,聚合物驱已经作为一种较为成熟的提高原油采收率技术在我国大多数油田得到不同程度的推广。随着大庆油田聚驱工业化区块的推广,到“十三五”期间,每天将有数万立方多余的含聚污水无法平衡。针对这个问题,开展了含聚污水配制稀释聚合物溶液技术研究,通过这几年开展的含聚污水配制稀释聚合物技术研究,取得了一定的成果,但含聚污水中残余聚合物对提高采收率的影响规律还需要进一步研究,为此,需要开展含聚污水中残余聚合物对提高采收率影响机理的探索性研究。本文首先采用冷冻升华制样和扫描电镜,分析了不同组成聚合物溶液中聚合物分子的微观形态,并分析了分子聚集体结构与驱油效率的关系;其次,进行了聚合物体系在天然岩心表面的静态吸附和动态滞留研究;第三,测定了不同聚合物体系中分子聚集体水力学半径和天然岩心的孔隙大小分布;最后,对“含聚污水中残余聚合物对聚驱提高采收率影响机理”进行了分析和总结当污配污稀体系中残余聚合物达到一定浓度时(200-400mg/L),对新添加聚合物的分子分布形态有显著影响,使聚合物网络结构变得致密,使网络结构链条增粗,从而增加了聚驱体系对水的束缚,使体系粘度升高、粘弹性增强,对提高采收率有利;含残聚体系在孔隙介质中能形成致密且连续性好的三维网络结构,对封堵高渗层有利。对残余聚合物的水解度分析表明,其水解度比新添加聚合物高,具有更多的负电核基团,对污水中阳离子的络合能力强于新聚合物,降低了阳离子对新添加聚合物的不良影响,间接保护了新聚合物,从而有利于提高整个体系的粘度和粘弹性,对提高采收率有利。随着残余聚合物浓度的升高,整个聚合物体系(含新聚合物)的总吸附量降低,减少了聚合物的吸附损失。
[Abstract]:At present, polymer flooding has been widely used in most oil fields in China as a mature oil recovery technology. With the expansion of the industrialized block of polymer flooding in Daqing Oilfield, tens of thousands of cubic meters of excess sewage will be out of balance every day during the 13th Five-Year Plan period. In order to solve this problem, the technical research on the preparation of dilute polymer solution with polymeric sewage has been carried out, and some achievements have been achieved through the technical research on the preparation of diluted polymer with polymeric sewage in recent years. However, the influence of residual polymer in polymerized sewage on oil recovery still needs to be further studied. Therefore, an exploratory study on the mechanism of residual polymer in polymerized sewage is needed. In this paper, the micromorphology of polymer molecules in different polymer solutions was analyzed by freezing sublimation and scanning electron microscopy, and the relationship between the structure of molecular aggregates and oil displacement efficiency was analyzed. The static adsorption and dynamic retention of polymer systems on the surface of natural cores were studied. Thirdly, the hydrodynamic radius of molecular aggregates and the pore size distribution of natural cores in different polymer systems were measured. The influence mechanism of residual polymer in polymerized sewage on the enhanced recovery factor of polymer flooding was analyzed and summarized. When the residual polymer in waste water system reached a certain concentration, it had a significant effect on the molecular distribution of the newly added polymer. The polymer network structure becomes dense and the network structure chain is thickened, thus increasing the binding of polymer flooding system to water, increasing the viscosity of the polymer flooding system and enhancing the viscoelasticity, which is beneficial to the increase of oil recovery. The residual accumulation system can form a dense and continuous three-dimensional network structure in porous media, which is beneficial to sealing the high permeability layer. The hydrolysis degree of the residual polymer is higher than that of the new added polymer, and it has more negative nuclear groups, and the complexing ability of the cations in sewage is stronger than that of the new polymer, which reduces the adverse effect of the cations on the new added polymers. The new polymer is protected indirectly, which is beneficial to increase the viscosity and viscoelasticity of the whole system. With the increase of the concentration of residual polymer, the total adsorption capacity of the whole polymer system (including new polymer) decreases and the adsorption loss of the polymer decreases.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE357.46

【参考文献】