Feasibility Study On Fine Waterflooding In Huan 26 Block

The Low-permeability reservoir resource occupies a large proportion in world petroleum resource. At present,the exploitation methods for low permeability reservoirs are water- flooding,air injection,CO2 injection and so on. Waterflooding is a relatively mature mining method,which is now commonly used in exploration.Waterflooding has been used since effect of nature energy exploration got worse.The Dujiatai formation in Huan26 block of huanxiling oilfield developed in 1980,and after natural energy exploitation of nearly 30 years,the development effect is getting worse every year,new development method must be used. Based on the research of reservoir geologic characteres,we analysised the production features and reservoir variation rules of Dujiatai formation.Huan26 block in the natural energy exploitation stage and fresh water flooding experiment stage ,and we foud out the residual oil distribution and direction.By numerical simulation and developing a pilot test in the block,we studied the conversion development mode of Dujiatai formation in Huan26 block in the late period of natual energy exploitation.By laboratory experiment and numerical simulation research,the best conversion development mode of Dujiatai formation in Huan26 Block is fine waterflooding,whic is feasible.Based on all the above research,we designed programs of full conversion to fine wateflooding,and then used the best one.