Xing 1?2 Block Eastern Part Composite System And Polymer Alternating Injection Dynamic Features Research

Xing 1?2 block eastern part ? block is the first industrialized ASP flooding block of DaQing,the mode of water injection is alkaline,surfactant,polymer ternary complex system general injection.At the beginning due to the ground injection process's poor Suitability,some of the injection well stations' pipes having frequently perforation and getting well dirt and so on these factors' influence,quality of ternary system fluctuates more largely,the producing rate of injection and production wells are low,the block gets worse effect,entering in the middle and late stage,difficult wells of block injection increase,injection time rate decrease,some wells reservoir utilized situation gets worse,section reverses,the effect of block development gets further worse.The results show that indoor,by optimization of complex systems and plug combination formulations segment,it can improve the effect of flooding and reduce the cost of chemical agents.For more serious heterogeneity of the reservoir,through injection of high-viscosity polymer slug make it get in and plug it into the permeable layer,improve macroscopic sweep efficiency,then inject low-viscosity ternary plug into mid and low permeability layer,improve the micro sweep efficiency and improve recovery rate,meanwhile it can save the amount of chemicals agents.Based on the findings indoor and interior reservoir development status of different injection stations and dynamically reflect the characteristics of injection,personalized design a program of polymer and complex system alternating injecting and make a research of dynamic reflect the characteristics of injection wells,alternate injection can effectively improve the utilization of reservoir conditions,alleviate the difficulties of injection,while saving more than 30%of the amount of chemicals agents.