Abstract: At present, the application demand of polymer flooding technology is shifting from low⁃salt reservoirs to high⁃salt and extra⁃high salt reservoirs. Improving the adaptability of polymers in high⁃salt reservoirs has become a technical problem that petroleum science and technology workers need to solve urgently. In order to improve the recovery rate of the target reservoirs, the “Chang 4+5” high⁃salt oil reservoir block of Changqing Oilfield was mainly based on the knowledge of physical chemistry, polymer materials science and reservoir engineering, through instrument detection and chemical analysis and physical simulation and other experimental methods, under the conditions of high salinity solvent water, the polymer solution reservoir adaptability study. The results show that the core permeability limit of the polymer solution is Kg=(25～40)×10-3 μm2 when the relative molecular mass is M=800×104 under the conditions of polymer concentration of CP=300～900 mg/L, permeability limit Kg=(30～55)×10-3 μm2 when M=1 400×104, Kg=(35～70)×10-3 μm2 when M=1 700×104 ,when M=2 000×104, Kg=(45～80)×10-3 μm2. Under the conditions of water and keep temperature injection in the target reservoir, the adaptability between reservoir rock and polymer solution is affected by rock permeability, polymer relative molecular mass and concentration. The top of the correlation curve is the compatibility area, and the lower part is the blocking area. The "hole throat radius median/Dh " ranged from 3.02 to 5.76 in the target reservoir.

Key words: High?salt reservoir, Physical simulation, Reservoir pore throat size, Matching relationship, Polymer molecular aggregate, Mechanism analysis

摘要： 目前，对聚合物驱油技术的需求正从低盐油藏向高盐和特高盐油藏转移，提高聚合物溶液在高盐油藏的适应性已经成为石油科技工作者亟待解决的技术难题。为了提高目标储层的采收率，主要对长庆油田“长4+5”高盐油藏区块，从物理化学、高分子材料学和油藏工程等知识入手，通过仪器检测、化学分析和物理模拟等实验方法，在高矿化度溶剂水条件下进行了聚合物溶液油藏适应性研究。结果表明，在聚合物质量浓度（CP）为300～900 mg/L的条件下，当聚合物的相对分子质量（M）分别为800×104、1 400×104、1 700×104、2 000×104时，聚合物溶液岩心渗透率极限（Kg）分别为（25～40）×10－3、（30～55）×10－3、（35～70）×10－3、（45～80）×10－3 μm2。在目标油藏注入水和温度条件下，油藏储层内岩石与水解聚丙烯酰胺聚合物溶液间配适性与岩石孔隙渗透率、聚合物相对分子质量和聚合物质量浓度等因素有关，相关曲线上方为配伍区，下方为堵塞区，孔喉半径中值与聚合物分子线团尺寸Dh的比值为3.02～5.76。

关键词: 高盐油藏, 物理模拟, 储层孔喉尺寸, 匹配关系, 聚合物分子聚集体, 机理分析