Research On The Identification Of High-Capacity Channels In Ultra-High Water Cut Stage In Saber Development Area

Due to long period of flooding，there is great change to the reservoir properties of Sabeioilfields，and low efficiency water circulation band is formed。Due to the low efficiencycirculation of a large quantity of water along this band，it is difilcult to further improve theswept volume of oil beds，so，the water injection volume for each ton of oil is Featlyincreased。Based on the fme geological description，under the thinking of “dynamic broadsurvey，static determination and testing demonstration”the analytical discrimination methodfor low efficiency water circulation band is formed.With the application of this method，thetypical block is surveyed and treated。The result shows that in efficient and ineffectiveinjection and recovery circulation mainly lies in．the deposit of meandering river and braidedchannel．It laterally mainly lies in the effective injection and recovery area,especially in thesubject channel sandstoneand high permeability banding sandstone．It vertically lies in thebottom of the single rhythm thick reservoir,generally taking one t11ird of all the reservoirthickness． The relative measures for different low efficiency water circulation bands areproposed to control the production decline of iloOding，slow down the water cut increasingrate and increase IOR of flooding。The results are significant.