中低渗高凝油藏用聚合物的相对分子质量设计与应用

Design and Application of Molecular Weight of Polymer in Medium-low Permeability and High Pour Point Reservoirs

李晓风 肖传敏 郭 斐 杨 灿 侯力嘉 倪 晨

LI Xiaofeng XIAO Chuanmin GUO Fei YANG Can HOU Lijia NI Chen

聚合物相对分子质量是评价化学驱体系注入性的重要参数，直接影响现场注入压力及驱油效果。针对中 低渗高凝油油藏S区块化学驱先导试验区个别井组出现注入压力高、注不进以及见效不均衡的问题，利用动态 光散射法、微孔滤膜法和注入性实验，开展高凝油油藏冷伤害后聚合物分子尺寸与储层微观孔喉匹配关系研 究。综合聚合物分子回转半径、水动力学尺寸以及注入性实验结果，将S区块聚合物相对分子质量由2000×104 调整为1200×104 ，单井注入厚度比例由42%～51%上升至64%～85%，为先导区聚合物相对分子质量调整以及扩 大区实施决策提供了依据。

Molecular weight of Polymer is an important parameter to evaluate the injectability of chemical flooding system，which directly affects the field injection pressure and oil displacement effect. In view of the problems of high injection pressure，poor injection and uneven effect of individual well groups in the chemical flooding pilot test area of block S of medium low permeability high pour point oil reservoir，the matching relationship between polymer molecular size and reservoir micro pore throat after cold damage of high pour point oil reservoir was studied by using dynamic light scattering method，microporous membrane method and natural core injectability experiment. Based on the polymer molecular radius of gyration，hydrodynamic size and injectability test results，the polymer molecular weight in block S was adjusted from 2000×104 to 1200×104 ，and the injection thickness ratio of single well was increased from 42%—51% to 64%—85%，which provided a basis for polymer molecular weight adjustment in the pilot area and decision-making in the expansion area.

10.19346/j.cnki.1000-4092.2023.03.014