| Worldwide,oil is an indispensable strategic resource.However,there are still some problems in the development of oil,such as great development difficulty and serious anisotropy of oil reservoir.Based on the geological data and mining history of Block H,this paper analyzes the heterogeneity characteristics of the block and the existing problems in the current development.Firstly,the experiments of polymer viscosity,rheology,adsorption and core flooding were carried out,the adaptability of polymer flooding agent to reservoir was analyzed,and the injection parameters of polymer were optimized combined with numerical simulation tools.Finally,according to the field experience,the selection of profile control wells and profile control parameters are optimized,and the formulation and dosage of profile control agent are determined through the comparative experiment of injection performance and gelling performance of profile control agent.The following conclusions are drawn through the research:Block H is in the stage of polymer flooding,with the characteristics of high water content,strong anisotropy and low degree of exploitation;CGF-3 polymer can meet the development needs of Block H.When the injection production ratio is 1.1,the injection rate is 0.13 PV/a,and the polymer injection concentration is 2000mg/L,the production effect is better,and the overall recovery of the block can be increased by 6.6%;Before polymer injection,a combination of 2300-2800mg/L 3613L-1 and type I-2 polymer +100-250mg/L organic chromium crosslinking agent with an effective concentration of1.5% is used for profile control.The two-stage slug method is used for polymer injection,which can significantly improve the oil displacement sweep coefficient and thus improve the oil displacement effect. |
PDF Full Text Request