长江大学学报（自然科学版）2025，Vol.22Issue(2)：53-60,8.
基于取心井的厚油层聚合物驱后剩余油分布规律研究
Residual oil distribution of thick reservoir after polymer flooding based on coring data
摘要
Abstract
At present,the thick reservoir sand body of Daqing oilfield has carried out polymer flooding and entered the subsequent water flooding stage.After polymer flooding,the distribution of remaining oil in the sand body of the thick reservoir is highly scattered,and the dominant seepage channels in the middle and lower part of the reservoir are developed.The quantitative description of the distribution of remaining oil after polymer flooding is the basis for four oil recovery and development adjustment in the later period.Using 36 closed coring data,logging interpretation and development dynamic data deployed before and after polyflooding in the north of Daqing Placanticline Oilfield,through the method of"combination of dynamic and static",statistical analysis and core displacement experiment,the changes of reservoir utilization status,water washing degree,oil saturation and fluid flow characteristics before and after polyflooding are quantitatively described.The law of oil-water seepage in different permeability reservoirs and the characteristics of polymer entering the reservoir during the process of polymer injection are defined.Study shows that the thickness of water washing before polymer flooding is 73.4％,and the thickness of water washing after polymer flooding is 91.0％.After polymer flooding,the thickness of strong and medium washing increased by 23.2％and 7.0％,while the proportion of weak and unwashed thickness decreased from 46.9％to 16.7％after polymer flooding.The oil saturation of reservoirs is mainly distributed between 45％and 65％before polyflooding,and between 25％and 45％after polyflooding.In the subsequent water drive stage of the high permeability layer,the seepage capacity of the fluid is further enhanced,and the residual oil saturation of the oil-water relative permeability curve decreases.The results show that there is still a certain material basis and development adjustment potential after polymer flooding,which is the main direction of fine exploration of remaining oil in the late stage of oilfield development and the fourth oil recovery development.关键词
厚油层/取心井组/聚合物驱/剩余油分布/含油饱和度Key words
thick oil layer/coring well group/polymer flooding/residual oil distribution/oil saturation分类
石油、天然气工程引用本文复制引用
白振强,皮彦夫,王清华,朱琦,张津搏,王义俊..基于取心井的厚油层聚合物驱后剩余油分布规律研究[J].长江大学学报（自然科学版）,2025,22(2):53-60,8.基金项目
中国石油天然气股份有限公司攻关性应用性科技专项"剩余油动态精细表征技术研究"(2023ZZ22-01). （2023ZZ22-01）
